Initial design: ESP32-S3 presence sensor with camera, mmWave, PIR, temp/humidity, light

- KiCad schematic and PCB layout (45x35mm board) - Full BOM with JLCPCB part numbers - ESPHome firmware configuration - 3D-printable wall-mount enclosure (OpenSCAD + STL) - Pin mapping and power budget documentation
2026-03-29 12:53:54 -05:00
commit 0240020cd2
12 changed files with 15072 additions and 0 deletions
--- a/BOM.csv
+++ b/BOM.csv
@@ -0,0 +1,43 @@
+Reference,Value,Footprint,JLCPCB_Part,Quantity,Description,Unit_Price_Est
+U3,ESP32-S3-WROOM-1-N16R8,RF_Module:ESP32-S3-WROOM-1,C2913202,1,WiFi+BLE MCU 16MB Flash 8MB PSRAM,$2.80
+U2,AMS1117-3.3,Package_TO_SOT_SMD:SOT-223-3_TabPin2,C6186,1,3.3V LDO Regulator 1A,$0.08
+U4,AP2112K-1.8,Package_TO_SOT_SMD:SOT-23-5,C51118,1,1.8V LDO for camera DOVDD,$0.10
+U5,AP2112K-2.8,Package_TO_SOT_SMD:SOT-23-5,C51114,1,2.8V LDO for camera AVDD,$0.10
+U6,SHT41,Sensirion_DFN-4-1EP_1.5x1.5mm,C2911456,1,Temp/Humidity ±0.2°C I2C,$1.20
+U7,BH1750FVI,Package_SO:WSOF-6_1.4x1.7mm,C78960,1,Ambient Light 1-65535 lux I2C,$0.50
+U1,USBLC6-2SC6,Package_TO_SOT_SMD:SOT-23-6,C7519,1,USB ESD Protection,$0.15
+J1,USB_C_16P,Connector_USB:USB_C_Receptacle_GCT_USB4125,C2765186,1,USB-C 16pin receptacle,$0.30
+J2,FPC_24P_OV5640,Connector_FFC-FPC:Molex_503480-2400,C2856805,1,24-pin 0.5mm FPC connector,$0.20
+J3,LD2410C,Connector_PinHeader_1.27mm:PinHeader_1x05_P1.27mm,N/A,1,1.27mm 5-pin header for LD2410C,$0.05
+J4,AM312_PIR,Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm,N/A,1,2.54mm 3-pin header for AM312,$0.03
+D1,LED_Blue,LED_SMD:LED_0402_1005Metric,C2286,1,Blue status LED 0402,$0.02
+R1,1K,Resistor_SMD:R_0402_1005Metric,C11702,1,LED current limit,$0.01
+R2,10K,Resistor_SMD:R_0402_1005Metric,C25744,1,PIR pulldown,$0.01
+R3,4.7K,Resistor_SMD:R_0402_1005Metric,C25900,1,I2C SDA pull-up,$0.01
+R4,4.7K,Resistor_SMD:R_0402_1005Metric,C25900,1,I2C SCL pull-up,$0.01
+C1,10uF,Capacitor_SMD:C_0805_2012Metric,C15850,1,LDO input cap,$0.02
+C2,22uF,Capacitor_SMD:C_0805_2012Metric,C45783,1,LDO output cap,$0.03
+C3,100nF,Capacitor_SMD:C_0402_1005Metric,C1525,1,LDO decoupling,$0.01
+C4,100nF,Capacitor_SMD:C_0402_1005Metric,C1525,1,ESP32 decoupling,$0.01
+C5,100nF,Capacitor_SMD:C_0402_1005Metric,C1525,1,ESP32 decoupling,$0.01
+C6,10uF,Capacitor_SMD:C_0805_2012Metric,C15850,1,ESP32 bulk cap,$0.02
+C7,10uF,Capacitor_SMD:C_0805_2012Metric,C15850,1,Camera power filter,$0.02
+C8,100nF,Capacitor_SMD:C_0402_1005Metric,C1525,1,Camera decoupling,$0.01
+C9,10uF,Capacitor_SMD:C_0805_2012Metric,C15850,1,LD2410C decoupling,$0.02
+C10,100nF,Capacitor_SMD:C_0402_1005Metric,C1525,1,SHT41 decoupling,$0.01
+C11,100nF,Capacitor_SMD:C_0402_1005Metric,C1525,1,BH1750 decoupling,$0.01
+SW1,BOOT,Button_Switch_SMD:SW_SPST_PTS810,C116501,1,Boot button (GPIO0),$0.05
+SW2,RESET,Button_Switch_SMD:SW_SPST_PTS810,C116501,1,Reset button (EN),$0.05
+H1,MountingHole,MountingHole:MountingHole_2.2mm_M2_Pad,N/A,1,M2 mounting hole,$0.00
+H2,MountingHole,MountingHole:MountingHole_2.2mm_M2_Pad,N/A,1,M2 mounting hole,$0.00
+,,,,,,
+,,,MODULES (not on PCB - plug in),,,,
+MOD1,OV5640,Camera Module 5MP 120° wide-angle,N/A,1,24-pin FPC OV5640 module,$3.50
+MOD2,HLK-LD2410C,24GHz mmWave Radar Module,N/A,1,5-pin presence radar,$2.50
+MOD3,AM312,Mini PIR Sensor Module,N/A,1,3-pin PIR sensor,$0.50
+,,,,,,
+,,,TOTAL PCB COMPONENTS,,28,~$5.50
+,,,TOTAL WITH MODULES,,31,~$12.00
+,,,PCB FABRICATION (5pcs JLCPCB),,,~$8.00
+,,,SMD ASSEMBLY (per board),,,~$12.00
+,,,TOTAL PER BOARD (assembled),,,"~$32.00"
--- a/PIN_MAPPING.md
+++ b/PIN_MAPPING.md
@@ -0,0 +1,67 @@
+# ESP32-S3 Pin Mapping - Presence Sensor
+
+## GPIO Assignments
+
+| GPIO | Function | Peripheral | Direction | Notes |
+|------|----------|-----------|-----------|-------|
+| GPIO0 | BOOT button | - | Input | Pull-up, hold low to enter bootloader |
+| GPIO1 | Camera D0 | OV5640 DVP | Input | Camera data bus |
+| GPIO2 | Camera D1 | OV5640 DVP | Input | Camera data bus |
+| GPIO3 | I2C SDA | SHT41 + BH1750 | Bidir | 4.7K pull-up to 3.3V |
+| GPIO4 | I2C SCL | SHT41 + BH1750 | Bidir | 4.7K pull-up to 3.3V |
+| GPIO5 | Camera D2 | OV5640 DVP | Input | Camera data bus |
+| GPIO6 | Camera D3 | OV5640 DVP | Input | Camera data bus |
+| GPIO7 | Camera D4 | OV5640 DVP | Input | Camera data bus |
+| GPIO8 | Camera D5 | OV5640 DVP | Input | Camera data bus |
+| GPIO9 | Camera D6 | OV5640 DVP | Input | Camera data bus |
+| GPIO10 | Camera D7 | OV5640 DVP | Input | Camera data bus |
+| GPIO11 | Camera XCLK | OV5640 | Output | 20MHz clock via LEDC PWM |
+| GPIO12 | Camera PCLK | OV5640 | Input | Pixel clock |
+| GPIO13 | Camera VSYNC | OV5640 | Input | Vertical sync |
+| GPIO14 | Camera HREF | OV5640 | Input | Horizontal reference |
+| GPIO15 | Camera SIOD | OV5640 SCCB | Bidir | Camera I2C data (separate bus) |
+| GPIO16 | Camera SIOC | OV5640 SCCB | Output | Camera I2C clock (separate bus) |
+| GPIO17 | mmWave UART TX | LD2410C RX | Output | 256000 baud |
+| GPIO18 | mmWave UART RX | LD2410C TX | Input | 256000 baud |
+| GPIO19 | USB D- | USB-C | Bidir | Native USB (programming) |
+| GPIO20 | USB D+ | USB-C | Bidir | Native USB (programming) |
+| GPIO21 | Camera PWDN | OV5640 | Output | Camera power down (active high) |
+| GPIO38 | PIR output | AM312 | Input | Digital HIGH on motion |
+| GPIO39 | mmWave OUT | LD2410C | Input | Digital presence output |
+| GPIO40 | Status LED | Blue LED | Output | Via 1K resistor |
+| GPIO41 | Camera RESET | OV5640 | Output | Camera reset (active low) |
+| GPIO47 | (Reserved) | - | - | PSRAM (if using octal) |
+| GPIO48 | (Reserved) | - | - | PSRAM (if using octal) |
+
+## I2C Bus (GPIO3/GPIO4)
+| Device | Address | Function |
+|--------|---------|----------|
+| SHT41 | 0x44 | Temperature + Humidity |
+| BH1750 | 0x23 | Ambient Light (ADDR pin LOW) |
+
+## UART1 (GPIO17/GPIO18)
+| Device | Baud | Function |
+|--------|------|----------|
+| LD2410C | 256000 | mmWave presence radar |
+
+## Power Rails
+| Rail | Source | Load |
+|------|--------|------|
+| 5V (VBUS) | USB-C | LD2410C, AMS1117 input |
+| 3.3V | AMS1117 | ESP32-S3, SHT41, BH1750, AM312, Camera digital |
+| 2.8V | AP2112K | OV5640 AVDD (analog) |
+| 1.8V | AP2112K | OV5640 DOVDD (digital I/O) |
+
+## Power Budget
+| Component | Voltage | Current (typical) | Current (peak) |
+|-----------|---------|-------------------|----------------|
+| ESP32-S3 (WiFi active) | 3.3V | 240mA | 500mA |
+| OV5640 (streaming) | 2.8V+1.8V | 140mA | 200mA |
+| LD2410C | 5V | 60mA | 150mA |
+| AM312 | 3.3V | 0.01mA | 0.01mA |
+| SHT41 | 3.3V | 0.4mA | 2mA |
+| BH1750 | 3.3V | 0.12mA | 0.2mA |
+| Status LED | 3.3V | 2mA | 2mA |
+| **Total** | - | **~445mA** | **~855mA** |
+
+USB-C provides 500mA default, 900mA with USB 3.0. Board should work fine on any USB charger (1A+).
--- a/README.md
+++ b/README.md
@@ -0,0 +1,113 @@
+# ESP32-S3 Presence Sensor
+
+Compact wall-mount presence sensor with camera, mmWave radar, PIR, temperature/humidity, and ambient light sensing. Designed for Home Assistant via ESPHome.
+
+## Features
+- **5MP Camera** (OV5640, 120° wide-angle) - video stream to HA
+- **24GHz mmWave Radar** (LD2410C) - presence detection even when still
+- **PIR Sensor** (AM312) - instant motion trigger
+- **Temp/Humidity** (SHT41) - ±0.2°C accuracy
+- **Light Sensor** (BH1750) - 1-65535 lux
+- **USB-C powered** - any 1A+ charger
+- **~45x35mm PCB** - wall mountable
+
+## How Detection Works
+
+```
+Motion event:
+  PIR (AM312) ──→ instant trigger (ms response)
+       │
+       ▼
+  mmWave (LD2410C) ──→ sustained presence tracking
+       │                (detects breathing/typing)
+       ▼
+  Combined "Occupancy" ──→ true if either sensor active
+                           30s delay before "unoccupied"
+```
+
+PIR catches fast motion immediately. mmWave confirms someone is still in the room even when sitting perfectly still. The combined sensor gives zero false-offs.
+
+## Project Files
+
+| File | Description |
+|------|-------------|
+| `presence-sensor.kicad_pro` | KiCad project file |
+| `presence-sensor.kicad_sch` | Schematic |
+| `PIN_MAPPING.md` | GPIO assignments and power budget |
+| `BOM.csv` | Bill of materials with JLCPCB part numbers |
+| `esphome-presence-sensor.yaml` | ESPHome firmware config |
+
+## Build Instructions
+
+### 1. Order PCBs
+- Open project in KiCad 8+
+- Complete PCB layout (place components, route traces)
+- Generate Gerbers: File → Plot → Gerber
+- Upload to [JLCPCB](https://jlcpcb.com)
+- Enable SMD assembly, upload BOM.csv
+
+### 2. Order Modules (plug-in, not soldered by JLCPCB)
+- OV5640 camera module (24-pin 0.5mm FPC, wide-angle 120°)
+- HLK-LD2410C mmWave radar module
+- AM312 mini PIR sensor
+
+### 3. Assembly
+- Solder LD2410C to 1.27mm header
+- Solder AM312 to 2.54mm header
+- Connect OV5640 via FPC cable
+
+### 4. Flash Firmware
+```bash
+# Install ESPHome
+pip install esphome
+
+# Create secrets.yaml
+cat > secrets.yaml << EOF
+wifi_ssid: "your-wifi"
+wifi_password: "your-password"
+api_key: "generate-a-key"
+ota_password: "your-ota-password"
+fallback_password: "your-fallback"
+EOF
+
+# Flash via USB-C (hold BOOT, press RESET, release BOOT)
+esphome run esphome-presence-sensor.yaml
+```
+
+### 5. Add to Home Assistant
+- ESPHome auto-discovers the device
+- Settings → Devices & Services → ESPHome → Configure
+
+## Cost Per Board
+
+| Item | Cost |
+|------|------|
+| PCB fabrication (5pcs) | ~$8 total |
+| SMD assembly | ~$12/board |
+| Components on PCB | ~$5.50/board |
+| OV5640 camera module | ~$3.50 |
+| LD2410C radar | ~$2.50 |
+| AM312 PIR | ~$0.50 |
+| **Total per board** | **~$32** |
+
+## Design Notes
+
+### Antenna Clearance
+- ESP32-S3 antenna extends past board edge
+- No copper pour under antenna area (top or bottom)
+- Keep antenna away from LD2410C radar module
+
+### Thermal
+- SHT41 placed on board edge, away from ESP32 heat
+- -1.5°C offset in ESPHome config (calibrate after testing)
+- Enclosure should have ventilation slots near SHT41
+
+### mmWave Orientation
+- LD2410C mounted perpendicular to wall for widest room coverage
+- Detection cone is ~60° in each direction
+- Optimal height: 1.2-1.5m from floor
+
+### Camera
+- OV5640 connects via 24-pin FPC flex cable
+- Camera module sits at top of enclosure, angled slightly down
+- 120° wide-angle lens covers most of a room from wall mount
--- a/enclosure/body.stl
+++ b/enclosure/body.stl
--- a/enclosure/body_only.scad
+++ b/enclosure/body_only.scad
@@ -0,0 +1,2 @@
+include <enclosure.scad>;
+// Only body is rendered (default render includes both)
--- a/enclosure/enclosure.scad
+++ b/enclosure/enclosure.scad
@@ -0,0 +1,185 @@
+// ============================================
+// Presence Sensor Wall-Mount Enclosure
+// ESP32-S3 + OV5640 + LD2410C + AM312 + SHT41 + BH1750
+// Board: 45 x 35 mm
+// ============================================
+
+// Dimensions (mm)
+pcb_w = 45;          // PCB width
+pcb_h = 35;          // PCB height
+pcb_t = 1.6;         // PCB thickness
+
+wall = 1.8;          // Wall thickness
+tolerance = 0.3;     // Fit tolerance
+bottom_gap = 3;      // Space below PCB for solder joints
+top_gap = 12;        // Space above PCB for components + modules
+lid_lip = 1.5;       // Lid overlap lip
+
+// Derived
+inner_w = pcb_w + tolerance * 2;
+inner_h = pcb_h + tolerance * 2;
+inner_d = bottom_gap + pcb_t + top_gap;
+outer_w = inner_w + wall * 2;
+outer_h = inner_h + wall * 2;
+outer_d = inner_d + wall;  // Open top (lid covers)
+
+// Screw post dimensions
+post_d = 4.5;        // Post outer diameter
+screw_d = 2.2;       // M2 screw hole
+post_h = bottom_gap;  // Height to PCB level
+
+// Component positions (from bottom-left of PCB)
+cam_x = pcb_w / 2;          // Camera centered horizontally
+cam_y = pcb_h - 5;          // Camera near top
+cam_hole_w = 10;             // Camera lens window
+cam_hole_h = 10;
+
+pir_x = 12;                 // PIR left of center
+pir_y = pcb_h - 20;
+pir_hole_d = 10;             // AM312 dome diameter
+
+light_x = 30;               // BH1750 right of center
+light_y = pcb_h - 20;
+light_hole_d = 4;            // Small window for light sensor
+
+mmwave_x = pcb_w / 2;       // LD2410C centered
+mmwave_y = 8;                // Near bottom
+mmwave_slot_w = 8;           // Slot for radar signal
+mmwave_slot_h = 36;
+
+usbc_x = pcb_w / 2;         // USB-C centered bottom
+usbc_w = 10;
+usbc_h = 4;
+
+vent_slot_w = 1.5;
+vent_slot_h = 8;
+
+// ============================================
+// Main body
+// ============================================
+module body() {
+    difference() {
+        // Outer shell
+        rounded_box(outer_w, outer_h, outer_d, 3);
+
+        // Inner cavity
+        translate([wall, wall, wall])
+            rounded_box(inner_w, inner_h, inner_d + 1, 2);
+
+        // Camera window (front face - top)
+        translate([wall + tolerance + cam_x - cam_hole_w/2,
+                   wall + tolerance + cam_y - cam_hole_h/2,
+                   -1])
+            rounded_box(cam_hole_w, cam_hole_h, wall + 2, 2);
+
+        // PIR window (front face)
+        translate([wall + tolerance + pir_x,
+                   wall + tolerance + pir_y,
+                   -1])
+            cylinder(h=wall+2, d=pir_hole_d, $fn=32);
+
+        // Light sensor window (front face)
+        translate([wall + tolerance + light_x,
+                   wall + tolerance + light_y,
+                   -1])
+            cylinder(h=wall+2, d=light_hole_d, $fn=32);
+
+        // USB-C cutout (bottom edge)
+        translate([wall + tolerance + usbc_x - usbc_w/2,
+                   -1,
+                   wall + bottom_gap - 1])
+            cube([usbc_w, wall + 2, usbc_h + 2]);
+
+        // Ventilation slots (sides - for SHT41 airflow)
+        for (i = [0:3]) {
+            // Left side
+            translate([-1,
+                       wall + 5 + i * (vent_slot_h + 2),
+                       wall + bottom_gap + pcb_t + 2])
+                cube([wall + 2, vent_slot_h, vent_slot_w]);
+            // Right side
+            translate([outer_w - wall - 1,
+                       wall + 5 + i * (vent_slot_h + 2),
+                       wall + bottom_gap + pcb_t + 2])
+                cube([wall + 2, vent_slot_h, vent_slot_w]);
+        }
+
+        // mmWave radar slot (through back wall for better signal)
+        translate([wall + tolerance + mmwave_x - mmwave_slot_w/2,
+                   wall + tolerance + mmwave_y - mmwave_slot_h/2,
+                   outer_d - wall - 0.5])
+            rounded_box(mmwave_slot_w, mmwave_slot_h, wall + 1, 1);
+
+        // Wall mount screw slots (keyhole on back)
+        translate([outer_w/2, outer_h * 0.3, outer_d - wall - 1])
+            wall_mount_keyhole();
+        translate([outer_w/2, outer_h * 0.7, outer_d - wall - 1])
+            wall_mount_keyhole();
+    }
+
+    // PCB support posts
+    for (pos = [[wall + tolerance + 2.5, wall + tolerance + 2.5],
+                [wall + tolerance + pcb_w - 2.5, wall + tolerance + 2.5],
+                [wall + tolerance + 2.5, wall + tolerance + pcb_h - 2.5],
+                [wall + tolerance + pcb_w - 2.5, wall + tolerance + pcb_h - 2.5]]) {
+        translate([pos[0], pos[1], wall])
+            difference() {
+                cylinder(h=post_h, d=post_d, $fn=20);
+                cylinder(h=post_h + 1, d=screw_d, $fn=20);
+            }
+    }
+}
+
+// ============================================
+// Lid (snap-fit)
+// ============================================
+module lid() {
+    difference() {
+        union() {
+            // Lid plate
+            rounded_box(outer_w, outer_h, wall, 3);
+
+            // Inner lip for alignment
+            translate([wall - lid_lip/2, wall - lid_lip/2, wall])
+                rounded_box(inner_w + lid_lip, inner_h + lid_lip, 2, 2);
+        }
+
+        // Status LED window (small hole)
+        translate([wall + tolerance + 40, wall + tolerance + 25, -1])
+            cylinder(h=wall+2, d=2, $fn=16);
+    }
+}
+
+// ============================================
+// Helper modules
+// ============================================
+module rounded_box(w, h, d, r) {
+    hull() {
+        translate([r, r, 0]) cylinder(h=d, r=r, $fn=20);
+        translate([w-r, r, 0]) cylinder(h=d, r=r, $fn=20);
+        translate([r, h-r, 0]) cylinder(h=d, r=r, $fn=20);
+        translate([w-r, h-r, 0]) cylinder(h=d, r=r, $fn=20);
+    }
+}
+
+module wall_mount_keyhole() {
+    // Large hole (screw head)
+    cylinder(h=wall+2, d=7, $fn=24);
+    // Slot (slide down to lock)
+    translate([0, -5, 0])
+        hull() {
+            cylinder(h=wall+2, d=4, $fn=24);
+            translate([0, 5, 0]) cylinder(h=wall+2, d=4, $fn=24);
+        }
+}
+
+// ============================================
+// Render
+// ============================================
+
+// Body
+body();
+
+// Lid (offset for viewing - move to origin for printing)
+translate([outer_w + 10, 0, 0])
+    lid();
--- a/enclosure/lid.stl
+++ b/enclosure/lid.stl
--- a/enclosure/lid_only.scad
+++ b/enclosure/lid_only.scad
@@ -0,0 +1,2 @@
+use <enclosure.scad>;
+lid();
--- a/esphome-presence-sensor.yaml
+++ b/esphome-presence-sensor.yaml
@@ -0,0 +1,202 @@
+substitutions:
+  name: presence-sensor
+  friendly_name: Presence Sensor
+
+esphome:
+  name: ${name}
+  friendly_name: ${friendly_name}
+  platformio_options:
+    board_build.flash_mode: dio
+    board_build.arduino.memory_type: qio_opi
+
+esp32:
+  board: esp32-s3-devkitc-1
+  framework:
+    type: esp-idf
+  flash_size: 16MB
+
+psram:
+  mode: octal
+  speed: 80MHz
+
+# Enable logging
+logger:
+  level: INFO
+
+# Enable Home Assistant API
+api:
+  encryption:
+    key: !secret api_key
+
+ota:
+  - platform: esphome
+    password: !secret ota_password
+
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+  ap:
+    ssid: "${name}-fallback"
+    password: !secret fallback_password
+
+# ==========================================
+# I2C Bus - SHT41 + BH1750
+# ==========================================
+i2c:
+  sda: GPIO3
+  scl: GPIO4
+  scan: true
+  frequency: 400kHz
+
+# ==========================================
+# UART - LD2410C mmWave Radar
+# ==========================================
+uart:
+  id: uart_ld2410
+  tx_pin: GPIO17
+  rx_pin: GPIO18
+  baud_rate: 256000
+  parity: NONE
+  stop_bits: 1
+
+# ==========================================
+# Camera - OV5640 5MP
+# ==========================================
+esp32_camera:
+  name: Camera
+  external_clock:
+    pin: GPIO11
+    frequency: 20MHz
+  i2c_pins:
+    sda: GPIO15
+    scl: GPIO16
+  data_pins: [GPIO1, GPIO2, GPIO5, GPIO6, GPIO7, GPIO8, GPIO9, GPIO10]
+  vsync_pin: GPIO13
+  href_pin: GPIO14
+  pixel_clock_pin: GPIO12
+  power_down_pin: GPIO21
+  reset_pin: GPIO41
+  resolution: 800x600
+  max_framerate: 15fps
+  idle_framerate: 0.2fps
+  jpeg_quality: 12
+  vertical_flip: false
+  horizontal_mirror: false
+
+esp32_camera_web_server:
+  - port: 8080
+    mode: stream
+
+# ==========================================
+# LD2410C mmWave Presence Radar
+# ==========================================
+ld2410:
+  uart_id: uart_ld2410
+  id: ld2410_radar
+
+binary_sensor:
+  # mmWave presence (stays on while someone is in room, even if still)
+  - platform: ld2410
+    has_target:
+      name: Presence
+    has_moving_target:
+      name: Moving Target
+    has_still_target:
+      name: Still Target
+
+  # PIR motion (fast initial trigger)
+  - platform: gpio
+    pin:
+      number: GPIO38
+      mode: INPUT
+    name: Motion
+    device_class: motion
+    filters:
+      - delayed_off: 10s
+
+  # Combined: PIR for instant trigger, mmWave for sustained presence
+  - platform: template
+    name: Occupancy
+    device_class: occupancy
+    lambda: |-
+      if (id(pir_motion).state || id(ld2410_presence).state) {
+        return true;
+      }
+      return false;
+    filters:
+      - delayed_off: 30s
+
+sensor:
+  # mmWave detection distance
+  - platform: ld2410
+    moving_distance:
+      name: Moving Distance
+    still_distance:
+      name: Still Distance
+    moving_energy:
+      name: Moving Energy
+    still_energy:
+      name: Still Energy
+    detection_distance:
+      name: Detection Distance
+
+  # Temperature & Humidity - SHT41
+  - platform: sht4x
+    temperature:
+      name: Temperature
+      accuracy_decimals: 1
+      filters:
+        - offset: -1.5  # Compensate for ESP32 heat, adjust after testing
+    humidity:
+      name: Humidity
+      accuracy_decimals: 1
+    address: 0x44
+    update_interval: 30s
+    heater_max_duty: 0.0
+
+  # Ambient Light - BH1750
+  - platform: bh1750
+    name: Illuminance
+    address: 0x23
+    measurement_duration: 69
+    update_interval: 10s
+
+  # WiFi signal
+  - platform: wifi_signal
+    name: WiFi Signal
+    update_interval: 60s
+
+  # Uptime
+  - platform: uptime
+    name: Uptime
+
+# ==========================================
+# Status LED
+# ==========================================
+light:
+  - platform: status_led
+    name: Status LED
+    pin: GPIO40
+
+# ==========================================
+# Buttons
+# ==========================================
+button:
+  - platform: restart
+    name: Restart
+
+  - platform: factory_reset
+    name: Factory Reset
+    disabled_by_default: true
+
+# ==========================================
+# Diagnostic
+# ==========================================
+text_sensor:
+  - platform: wifi_info
+    ip_address:
+      name: IP Address
+    ssid:
+      name: Connected SSID
+  - platform: version
+    name: ESPHome Version
--- a/presence-sensor.kicad_pcb
+++ b/presence-sensor.kicad_pcb
@@ -0,0 +1,380 @@
+(kicad_pcb
+  (version 20221018)
+  (generator "custom_generator")
+  (general
+    (thickness 1.6)
+    (legacy_teardrops no)
+  )
+  (paper "A4")
+  (title_block
+    (title "ESP32-S3 Presence Sensor")
+    (date "2026-03-29")
+    (rev "1.0")
+  )
+  (layers
+    (0 "F.Cu" signal)
+    (31 "B.Cu" signal)
+    (32 "B.Adhes" user "B.Adhesive")
+    (33 "F.Adhes" user "F.Adhesive")
+    (34 "B.Paste" user)
+    (35 "F.Paste" user)
+    (36 "B.SilkS" user "B.Silkscreen")
+    (37 "F.SilkS" user "F.Silkscreen")
+    (38 "B.Mask" user "B.Mask")
+    (39 "F.Mask" user "F.Mask")
+    (44 "Edge.Cuts" user)
+  )
+  (setup
+    (pad_to_mask_clearance 0.05)
+    (allow_soldermask_bridges_in_footprints no)
+    (pcbplotparams
+      (layerselection 0x00010fc_ffffffff)
+      (plot_on_all_layers_selection 0x0000000_00000000)
+      (disableapertmacros no)
+      (usegerberextensions no)
+      (usegerberattributes yes)
+      (usegerberadvancedattributes yes)
+      (creategerberjobfile yes)
+      (svgprecision 4)
+      (plotframeref no)
+      (viasonmask no)
+      (mode 1)
+      (useauxorigin no)
+      (hpglpennumber 1)
+      (hpglpenspeed 20)
+      (hpglpendiameter 15)
+      (dxfpolygonmode yes)
+      (dxfimperialunits yes)
+      (dxfusepcbnewfont yes)
+      (psnegative no)
+      (psa4output no)
+      (plotreference yes)
+      (plotvalue yes)
+      (plotfptext no)
+      (plotinvisibletext no)
+      (sketchpadsonfab no)
+      (subtractmaskfromsilk no)
+      (outputformat 1)
+      (mirror no)
+      (drillshape 1)
+      (scaleselection 1)
+      (outputdirectory "gerbers/")
+    )
+  )
+
+  ;; =====================================================
+  ;; BOARD OUTLINE - 45mm x 35mm with rounded corners
+  ;; =====================================================
+  (gr_arc (start 3 0) (mid 0.879 0.879) (end 0 3) (layer "Edge.Cuts") (width 0.15))
+  (gr_line (start 3 0) (end 42 0) (layer "Edge.Cuts") (width 0.15))
+  (gr_arc (start 45 3) (mid 44.121 0.879) (end 42 0) (layer "Edge.Cuts") (width 0.15))
+  (gr_line (start 45 3) (end 45 32) (layer "Edge.Cuts") (width 0.15))
+  (gr_arc (start 42 35) (mid 44.121 34.121) (end 45 32) (layer "Edge.Cuts") (width 0.15))
+  (gr_line (start 42 35) (end 3 35) (layer "Edge.Cuts") (width 0.15))
+  (gr_arc (start 0 32) (mid 0.879 34.121) (end 3 35) (layer "Edge.Cuts") (width 0.15))
+  (gr_line (start 0 32) (end 0 3) (layer "Edge.Cuts") (width 0.15))
+
+  ;; =====================================================
+  ;; COMPONENT PLACEMENT (all coordinates in mm from top-left)
+  ;; Front = component side (facing room)
+  ;; Back = wall side
+  ;; =====================================================
+
+  ;; --- BACK SIDE (facing wall) ---
+
+  ;; ESP32-S3-WROOM-1 - center of board, back side
+  ;; Module is 18x25.5mm, antenna at top extending past board edge
+  (footprint "RF_Module:ESP32-S3-WROOM-1"
+    (layer "B.Cu")
+    (at 22.5 18 0)
+    (property "Reference" "U3")
+    (property "Value" "ESP32-S3-WROOM-1-N16R8")
+    (property "JLCPCB" "C2913202")
+  )
+
+  ;; AMS1117-3.3 LDO - bottom right, back side
+  (footprint "Package_TO_SOT_SMD:SOT-223-3_TabPin2"
+    (layer "B.Cu")
+    (at 38 30 0)
+    (property "Reference" "U2")
+    (property "Value" "AMS1117-3.3")
+    (property "JLCPCB" "C6186")
+  )
+
+  ;; AP2112K-1.8 (camera DOVDD) - top right, back side
+  (footprint "Package_TO_SOT_SMD:SOT-23-5"
+    (layer "B.Cu")
+    (at 38 5 0)
+    (property "Reference" "U4")
+    (property "Value" "AP2112K-1.8")
+    (property "JLCPCB" "C51118")
+  )
+
+  ;; AP2112K-2.8 (camera AVDD) - top right, back side
+  (footprint "Package_TO_SOT_SMD:SOT-23-5"
+    (layer "B.Cu")
+    (at 38 10 0)
+    (property "Reference" "U5")
+    (property "Value" "AP2112K-2.8")
+    (property "JLCPCB" "C51114")
+  )
+
+  ;; USB ESD Protection
+  (footprint "Package_TO_SOT_SMD:SOT-23-6"
+    (layer "B.Cu")
+    (at 22.5 32 0)
+    (property "Reference" "U1")
+    (property "Value" "USBLC6-2SC6")
+    (property "JLCPCB" "C7519")
+  )
+
+  ;; --- FRONT SIDE (facing room) ---
+
+  ;; USB-C connector - bottom center, front side
+  (footprint "Connector_USB:USB_C_Receptacle_GCT_USB4125"
+    (layer "F.Cu")
+    (at 22.5 35 180)
+    (property "Reference" "J1")
+    (property "Value" "USB_C_16P")
+    (property "JLCPCB" "C2765186")
+  )
+
+  ;; FPC camera connector - top center, front side
+  (footprint "Connector_FFC-FPC:Molex_503480-2400_1x24-1MP_P0.50mm_Horizontal"
+    (layer "F.Cu")
+    (at 22.5 2 0)
+    (property "Reference" "J2")
+    (property "Value" "FPC_24P_OV5640")
+    (property "JLCPCB" "C2856805")
+  )
+
+  ;; LD2410C header - right side, front
+  (footprint "Connector_PinHeader_1.27mm:PinHeader_1x05_P1.27mm_Vertical"
+    (layer "F.Cu")
+    (at 42 17.5 90)
+    (property "Reference" "J3")
+    (property "Value" "LD2410C")
+  )
+
+  ;; AM312 PIR header - left side, front
+  (footprint "Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical"
+    (layer "F.Cu")
+    (at 3 15 90)
+    (property "Reference" "J4")
+    (property "Value" "AM312_PIR")
+  )
+
+  ;; SHT41 - left edge, front (away from ESP32 heat)
+  (footprint "Sensor_Humidity:Sensirion_DFN-4-1EP_1.5x1.5mm_P0.8mm_EP0.5x0.5mm"
+    (layer "F.Cu")
+    (at 4 28 0)
+    (property "Reference" "U6")
+    (property "Value" "SHT41")
+    (property "JLCPCB" "C2911456")
+  )
+
+  ;; BH1750 - left of center, front
+  (footprint "Package_SO:WSOF-6_1.4x1.7mm_P0.5mm"
+    (layer "F.Cu")
+    (at 12 22 0)
+    (property "Reference" "U7")
+    (property "Value" "BH1750FVI")
+    (property "JLCPCB" "C78960")
+  )
+
+  ;; Status LED - front side, visible
+  (footprint "LED_SMD:LED_0402_1005Metric"
+    (layer "F.Cu")
+    (at 40 28 0)
+    (property "Reference" "D1")
+    (property "Value" "LED_Blue")
+    (property "JLCPCB" "C2286")
+  )
+
+  ;; --- PASSIVE COMPONENTS (back side, near their ICs) ---
+
+  ;; Input cap - near AMS1117
+  (footprint "Capacitor_SMD:C_0805_2012Metric"
+    (layer "B.Cu")
+    (at 33 30 0)
+    (property "Reference" "C1")
+    (property "Value" "10uF")
+  )
+
+  ;; Output cap - near AMS1117
+  (footprint "Capacitor_SMD:C_0805_2012Metric"
+    (layer "B.Cu")
+    (at 33 33 0)
+    (property "Reference" "C2")
+    (property "Value" "22uF")
+  )
+
+  ;; Decoupling caps - near ESP32
+  (footprint "Capacitor_SMD:C_0402_1005Metric"
+    (layer "B.Cu")
+    (at 15 8 0)
+    (property "Reference" "C3")
+    (property "Value" "100nF")
+  )
+  (footprint "Capacitor_SMD:C_0402_1005Metric"
+    (layer "B.Cu")
+    (at 15 10 0)
+    (property "Reference" "C4")
+    (property "Value" "100nF")
+  )
+  (footprint "Capacitor_SMD:C_0402_1005Metric"
+    (layer "B.Cu")
+    (at 15 12 0)
+    (property "Reference" "C5")
+    (property "Value" "100nF")
+  )
+  (footprint "Capacitor_SMD:C_0805_2012Metric"
+    (layer "B.Cu")
+    (at 15 14 0)
+    (property "Reference" "C6")
+    (property "Value" "10uF")
+  )
+
+  ;; Camera power caps
+  (footprint "Capacitor_SMD:C_0805_2012Metric"
+    (layer "B.Cu")
+    (at 35 3 0)
+    (property "Reference" "C7")
+    (property "Value" "10uF")
+  )
+  (footprint "Capacitor_SMD:C_0402_1005Metric"
+    (layer "B.Cu")
+    (at 35 7 0)
+    (property "Reference" "C8")
+    (property "Value" "100nF")
+  )
+
+  ;; LD2410C decoupling
+  (footprint "Capacitor_SMD:C_0805_2012Metric"
+    (layer "B.Cu")
+    (at 40 15 0)
+    (property "Reference" "C9")
+    (property "Value" "10uF")
+  )
+
+  ;; SHT41 decoupling
+  (footprint "Capacitor_SMD:C_0402_1005Metric"
+    (layer "F.Cu")
+    (at 7 28 0)
+    (property "Reference" "C10")
+    (property "Value" "100nF")
+  )
+
+  ;; BH1750 decoupling
+  (footprint "Capacitor_SMD:C_0402_1005Metric"
+    (layer "F.Cu")
+    (at 15 22 0)
+    (property "Reference" "C11")
+    (property "Value" "100nF")
+  )
+
+  ;; Resistors
+  (footprint "Resistor_SMD:R_0402_1005Metric"
+    (layer "F.Cu")
+    (at 38 28 0)
+    (property "Reference" "R1")
+    (property "Value" "1K")
+    (property "Description" "LED resistor")
+  )
+  (footprint "Resistor_SMD:R_0402_1005Metric"
+    (layer "F.Cu")
+    (at 5 15 0)
+    (property "Reference" "R2")
+    (property "Value" "10K")
+    (property "Description" "PIR pulldown")
+  )
+  (footprint "Resistor_SMD:R_0402_1005Metric"
+    (layer "F.Cu")
+    (at 8 24 0)
+    (property "Reference" "R3")
+    (property "Value" "4.7K")
+    (property "Description" "I2C SDA pull-up")
+  )
+  (footprint "Resistor_SMD:R_0402_1005Metric"
+    (layer "F.Cu")
+    (at 10 24 0)
+    (property "Reference" "R4")
+    (property "Value" "4.7K")
+    (property "Description" "I2C SCL pull-up")
+  )
+
+  ;; Buttons - back side, accessible via pinhole
+  (footprint "Button_Switch_SMD:SW_SPST_PTS810"
+    (layer "B.Cu")
+    (at 5 33 0)
+    (property "Reference" "SW1")
+    (property "Value" "BOOT")
+  )
+  (footprint "Button_Switch_SMD:SW_SPST_PTS810"
+    (layer "B.Cu")
+    (at 10 33 0)
+    (property "Reference" "SW2")
+    (property "Value" "RESET")
+  )
+
+  ;; Mounting holes
+  (footprint "MountingHole:MountingHole_2.2mm_M2_Pad"
+    (layer "F.Cu")
+    (at 2.5 2.5 0)
+    (property "Reference" "H1")
+    (property "Value" "MountingHole")
+  )
+  (footprint "MountingHole:MountingHole_2.2mm_M2_Pad"
+    (layer "F.Cu")
+    (at 42.5 2.5 0)
+    (property "Reference" "H2")
+    (property "Value" "MountingHole")
+  )
+
+  ;; =====================================================
+  ;; SILKSCREEN LABELS
+  ;; =====================================================
+  (gr_text "Presence Sensor v1.0"
+    (at 22.5 17.5 0)
+    (layer "F.SilkS")
+    (effects (font (size 1.2 1.2) (thickness 0.2)) (justify center))
+  )
+  (gr_text "github.com/chrisryn"
+    (at 22.5 19.5 0)
+    (layer "F.SilkS")
+    (effects (font (size 0.8 0.8) (thickness 0.15)) (justify center))
+  )
+  (gr_text "CAM"
+    (at 22.5 4 0)
+    (layer "F.SilkS")
+    (effects (font (size 0.8 0.8) (thickness 0.15)) (justify center))
+  )
+  (gr_text "PIR"
+    (at 3 12 0)
+    (layer "F.SilkS")
+    (effects (font (size 0.8 0.8) (thickness 0.15)) (justify center))
+  )
+  (gr_text "mmWave"
+    (at 42 14 0)
+    (layer "F.SilkS")
+    (effects (font (size 0.8 0.8) (thickness 0.15)) (justify center))
+  )
+  (gr_text "USB-C"
+    (at 22.5 33 0)
+    (layer "F.SilkS")
+    (effects (font (size 0.8 0.8) (thickness 0.15)) (justify center))
+  )
+
+  ;; =====================================================
+  ;; ANTENNA KEEP-OUT ZONE
+  ;; ESP32-S3 antenna at top of module - no copper
+  ;; =====================================================
+  (gr_rect (start 13 0) (end 32 6)
+    (layer "F.SilkS") (width 0.15) (fill none)
+  )
+  (gr_text "ANTENNA KEEP-OUT"
+    (at 22.5 3 0)
+    (layer "B.SilkS")
+    (effects (font (size 0.6 0.6) (thickness 0.1)) (justify center))
+  )
+)
--- a/presence-sensor.kicad_pro
+++ b/presence-sensor.kicad_pro
@@ -0,0 +1,135 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "board_outline_line_width": 0.1,
+        "copper_line_width": 0.2,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "other_line_width": 0.15,
+        "silk_line_width": 0.15,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.15
+      },
+      "diff_pair_dimensions": [],
+      "drc_exclusions": [],
+      "rules": {
+        "min_copper_edge_clearance": 0.0,
+        "solder_mask_to_copper_clearance": 0.0
+      },
+      "track_widths": [0.0, 0.25, 0.5, 1.0],
+      "via_dimensions": []
+    },
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "presence-sensor.kicad_pro",
+    "version": 1
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.25,
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      },
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Power",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.5,
+        "via_diameter": 0.8,
+        "via_drill": 0.4,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 3
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": []
+  },
+  "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "",
+      "specctra_dsn": "",
+      "step": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "drawing": {
+      "dashed_lines_dash_length_ratio": 12.0,
+      "dashed_lines_gap_length_ratio": 3.0,
+      "default_line_thickness": 6.0,
+      "default_text_size": 50.0,
+      "field_names": [],
+      "intersheets_ref_own_page": false,
+      "intersheets_ref_prefix": "",
+      "intersheets_ref_short": false,
+      "intersheets_ref_show": false,
+      "intersheets_ref_suffix": "",
+      "junction_size_choice": 3,
+      "label_size_ratio": 0.375,
+      "pin_symbol_size": 25.0,
+      "text_offset_ratio": 0.15
+    },
+    "legacy_lib_dir": "",
+    "legacy_lib_list": [],
+    "meta": {
+      "version": 1
+    },
+    "net_format_name": "",
+    "page_layout_descr_file": "",
+    "plot_directory": "",
+    "spice_current_sheet_as_root": false,
+    "spice_external_command": "spice \"%I\"",
+    "spice_save_all_currents": false,
+    "spice_save_all_voltages": false,
+    "subpart_first_id": 65,
+    "subpart_id_separator": 0
+  },
+  "sheets": [
+    [
+      "e63e39d7-6ac0-4ffd-8aa3-1841a4541b55",
+      "Root"
+    ]
+  ],
+  "text_variables": {}
+}
--- a/presence-sensor.kicad_sch
+++ b/presence-sensor.kicad_sch
@@ -0,0 +1,415 @@
+(kicad_sch
+  (version 20230121)
+  (generator "custom")
+  (uuid "e63e39d7-6ac0-4ffd-8aa3-1841a4541b55")
+  (paper "A3")
+
+  (title_block
+    (title "ESP32-S3 Presence Sensor")
+    (date "2026-03-29")
+    (rev "1.0")
+    (comment 1 "Wall-mount presence sensor with camera")
+    (comment 2 "ESP32-S3 + OV5640 + LD2410C + AM312 + SHT41 + BH1750")
+  )
+
+  ;; =====================================================
+  ;; POWER SECTION - USB-C Input + 3.3V Regulation
+  ;; =====================================================
+
+  (text "USB-C Power Input + 3.3V LDO"
+    (at 25 25 0)
+    (effects (font (size 3 3) (thickness 0.5)) (justify left))
+  )
+
+  ;; USB-C Connector (USB4125-GF-A - 16 pin USB-C)
+  (symbol
+    (lib_id "Connector:USB_C_Receptacle_USB2.0")
+    (at 40 60 0)
+    (uuid "a1000001-0001-0001-0001-000000000001")
+    (property "Reference" "J1" (at 40 42 0))
+    (property "Value" "USB_C_16P" (at 40 44 0))
+    (property "Footprint" "Connector_USB:USB_C_Receptacle_GCT_USB4125" (at 40 60 0))
+    (property "JLCPCB" "C2765186" (at 40 60 0))
+  )
+
+  ;; ESD Protection (USBLC6-2SC6)
+  (symbol
+    (lib_id "Power_Protection:USBLC6-2SC6")
+    (at 70 60 0)
+    (uuid "a1000001-0001-0001-0001-000000000002")
+    (property "Reference" "U1" (at 70 50 0))
+    (property "Value" "USBLC6-2SC6" (at 70 52 0))
+    (property "Footprint" "Package_TO_SOT_SMD:SOT-23-6" (at 70 60 0))
+    (property "JLCPCB" "C7519" (at 70 60 0))
+  )
+
+  ;; AMS1117-3.3 LDO Regulator
+  (symbol
+    (lib_id "Regulator_Linear:AMS1117-3.3")
+    (at 100 55 0)
+    (uuid "a1000001-0001-0001-0001-000000000003")
+    (property "Reference" "U2" (at 100 47 0))
+    (property "Value" "AMS1117-3.3" (at 100 49 0))
+    (property "Footprint" "Package_TO_SOT_SMD:SOT-223-3_TabPin2" (at 100 55 0))
+    (property "JLCPCB" "C6186" (at 100 55 0))
+  )
+
+  ;; Input capacitor 10uF
+  (symbol
+    (lib_id "Device:C")
+    (at 90 65 0)
+    (uuid "a1000001-0001-0001-0001-000000000004")
+    (property "Reference" "C1" (at 92 63 0))
+    (property "Value" "10uF" (at 92 67 0))
+    (property "Footprint" "Capacitor_SMD:C_0805_2012Metric" (at 90 65 0))
+    (property "JLCPCB" "C15850" (at 90 65 0))
+  )
+
+  ;; Output capacitor 22uF
+  (symbol
+    (lib_id "Device:C")
+    (at 110 65 0)
+    (uuid "a1000001-0001-0001-0001-000000000005")
+    (property "Reference" "C2" (at 112 63 0))
+    (property "Value" "22uF" (at 112 67 0))
+    (property "Footprint" "Capacitor_SMD:C_0805_2012Metric" (at 110 65 0))
+    (property "JLCPCB" "C45783" (at 110 65 0))
+  )
+
+  ;; Output capacitor 100nF decoupling
+  (symbol
+    (lib_id "Device:C")
+    (at 120 65 0)
+    (uuid "a1000001-0001-0001-0001-000000000006")
+    (property "Reference" "C3" (at 122 63 0))
+    (property "Value" "100nF" (at 122 67 0))
+    (property "Footprint" "Capacitor_SMD:C_0402_1005Metric" (at 120 65 0))
+    (property "JLCPCB" "C1525" (at 120 65 0))
+  )
+
+  ;; =====================================================
+  ;; MCU - ESP32-S3-WROOM-1 (N16R8)
+  ;; =====================================================
+
+  (text "ESP32-S3-WROOM-1 (N16R8) - Main MCU"
+    (at 25 100 0)
+    (effects (font (size 3 3) (thickness 0.5)) (justify left))
+  )
+
+  (symbol
+    (lib_id "RF_Module:ESP32-S3-WROOM-1")
+    (at 80 160 0)
+    (uuid "a1000001-0001-0001-0001-000000000010")
+    (property "Reference" "U3" (at 80 115 0))
+    (property "Value" "ESP32-S3-WROOM-1-N16R8" (at 80 117 0))
+    (property "Footprint" "RF_Module:ESP32-S3-WROOM-1" (at 80 160 0))
+    (property "JLCPCB" "C2913202" (at 80 160 0))
+    (property "Description" "ESP32-S3 WiFi+BLE module, 16MB Flash, 8MB PSRAM" (at 80 160 0))
+  )
+
+  ;; Boot button (GPIO0)
+  (symbol
+    (lib_id "Switch:SW_Push")
+    (at 35 145 0)
+    (uuid "a1000001-0001-0001-0001-000000000011")
+    (property "Reference" "SW1" (at 35 140 0))
+    (property "Value" "BOOT" (at 35 150 0))
+    (property "Footprint" "Button_Switch_SMD:SW_SPST_PTS810" (at 35 145 0))
+    (property "JLCPCB" "C116501" (at 35 145 0))
+  )
+
+  ;; Reset button (EN)
+  (symbol
+    (lib_id "Switch:SW_Push")
+    (at 35 160 0)
+    (uuid "a1000001-0001-0001-0001-000000000012")
+    (property "Reference" "SW2" (at 35 155 0))
+    (property "Value" "RESET" (at 35 165 0))
+    (property "Footprint" "Button_Switch_SMD:SW_SPST_PTS810" (at 35 160 0))
+    (property "JLCPCB" "C116501" (at 35 160 0))
+  )
+
+  ;; ESP32-S3 decoupling caps (3x 100nF + 1x 10uF)
+  (symbol
+    (lib_id "Device:C")
+    (at 55 120 0)
+    (uuid "a1000001-0001-0001-0001-000000000013")
+    (property "Reference" "C4" (at 57 118 0))
+    (property "Value" "100nF" (at 57 122 0))
+    (property "Footprint" "Capacitor_SMD:C_0402_1005Metric" (at 55 120 0))
+  )
+  (symbol
+    (lib_id "Device:C")
+    (at 62 120 0)
+    (uuid "a1000001-0001-0001-0001-000000000014")
+    (property "Reference" "C5" (at 64 118 0))
+    (property "Value" "100nF" (at 64 122 0))
+    (property "Footprint" "Capacitor_SMD:C_0402_1005Metric" (at 62 120 0))
+  )
+  (symbol
+    (lib_id "Device:C")
+    (at 69 120 0)
+    (uuid "a1000001-0001-0001-0001-000000000015")
+    (property "Reference" "C6" (at 71 118 0))
+    (property "Value" "10uF" (at 71 122 0))
+    (property "Footprint" "Capacitor_SMD:C_0805_2012Metric" (at 69 120 0))
+  )
+
+  ;; Status LED
+  (symbol
+    (lib_id "Device:LED")
+    (at 130 140 0)
+    (uuid "a1000001-0001-0001-0001-000000000016")
+    (property "Reference" "D1" (at 132 138 0))
+    (property "Value" "LED_Blue" (at 132 142 0))
+    (property "Footprint" "LED_SMD:LED_0402_1005Metric" (at 130 140 0))
+    (property "JLCPCB" "C2286" (at 130 140 0))
+  )
+
+  ;; LED resistor
+  (symbol
+    (lib_id "Device:R")
+    (at 130 130 0)
+    (uuid "a1000001-0001-0001-0001-000000000017")
+    (property "Reference" "R1" (at 132 130 0))
+    (property "Value" "1K" (at 134 130 0))
+    (property "Footprint" "Resistor_SMD:R_0402_1005Metric" (at 130 130 0))
+    (property "JLCPCB" "C11702" (at 130 130 0))
+  )
+
+  ;; =====================================================
+  ;; CAMERA - OV5640 via 24-pin FPC connector
+  ;; =====================================================
+
+  (text "OV5640 5MP Camera Module (24-pin FPC)"
+    (at 170 25 0)
+    (effects (font (size 3 3) (thickness 0.5)) (justify left))
+  )
+
+  ;; 24-pin FPC connector for OV5640
+  (symbol
+    (lib_id "Connector_Generic:Conn_01x24")
+    (at 190 80 0)
+    (uuid "a1000001-0001-0001-0001-000000000020")
+    (property "Reference" "J2" (at 190 42 0))
+    (property "Value" "FPC_24P_OV5640" (at 190 44 0))
+    (property "Footprint" "Connector_FFC-FPC:Molex_503480-2400_1x24-1MP_P0.50mm_Horizontal" (at 190 80 0))
+    (property "JLCPCB" "C2856805" (at 190 80 0))
+    (property "Description" "24-pin 0.5mm FPC connector for OV5640 camera module" (at 190 80 0))
+  )
+
+  ;; Camera power filter caps
+  (symbol
+    (lib_id "Device:C")
+    (at 175 50 0)
+    (uuid "a1000001-0001-0001-0001-000000000021")
+    (property "Reference" "C7" (at 177 48 0))
+    (property "Value" "10uF" (at 177 52 0))
+    (property "Footprint" "Capacitor_SMD:C_0805_2012Metric" (at 175 50 0))
+  )
+  (symbol
+    (lib_id "Device:C")
+    (at 182 50 0)
+    (uuid "a1000001-0001-0001-0001-000000000022")
+    (property "Reference" "C8" (at 184 48 0))
+    (property "Value" "100nF" (at 184 52 0))
+    (property "Footprint" "Capacitor_SMD:C_0402_1005Metric" (at 182 50 0))
+  )
+
+  ;; Camera 1.8V LDO (for DOVDD)
+  (symbol
+    (lib_id "Regulator_Linear:AP2112K-1.8")
+    (at 210 50 0)
+    (uuid "a1000001-0001-0001-0001-000000000023")
+    (property "Reference" "U4" (at 210 42 0))
+    (property "Value" "AP2112K-1.8" (at 210 44 0))
+    (property "Footprint" "Package_TO_SOT_SMD:SOT-23-5" (at 210 50 0))
+    (property "JLCPCB" "C51118" (at 210 50 0))
+    (property "Description" "1.8V LDO for camera DOVDD" (at 210 50 0))
+  )
+
+  ;; Camera 2.8V LDO (for AVDD)
+  (symbol
+    (lib_id "Regulator_Linear:AP2112K-2.8")
+    (at 210 70 0)
+    (uuid "a1000001-0001-0001-0001-000000000024")
+    (property "Reference" "U5" (at 210 62 0))
+    (property "Value" "AP2112K-2.8" (at 210 64 0))
+    (property "Footprint" "Package_TO_SOT_SMD:SOT-23-5" (at 210 70 0))
+    (property "JLCPCB" "C51114" (at 210 70 0))
+    (property "Description" "2.8V LDO for camera AVDD" (at 210 70 0))
+  )
+
+  ;; 24MHz crystal oscillator for camera XCLK (if not using ESP32 LEDC PWM)
+  ;; Note: ESP32-S3 can generate XCLK via LEDC, so crystal is optional
+  ;; Using LEDC output from GPIO15 instead
+
+  ;; =====================================================
+  ;; mmWave RADAR - HLK-LD2410C
+  ;; =====================================================
+
+  (text "HLK-LD2410C 24GHz mmWave Presence Radar"
+    (at 170 120 0)
+    (effects (font (size 3 3) (thickness 0.5)) (justify left))
+  )
+
+  ;; LD2410C connector (5-pin: VCC, GND, TX, RX, OUT)
+  (symbol
+    (lib_id "Connector_Generic:Conn_01x05")
+    (at 200 145 0)
+    (uuid "a1000001-0001-0001-0001-000000000030")
+    (property "Reference" "J3" (at 200 135 0))
+    (property "Value" "LD2410C" (at 200 137 0))
+    (property "Footprint" "Connector_PinHeader_1.27mm:PinHeader_1x05_P1.27mm_Vertical" (at 200 145 0))
+    (property "Description" "HLK-LD2410C 24GHz mmWave radar module connector" (at 200 145 0))
+    (pin_names
+      (pin "1" "VCC_5V")
+      (pin "2" "GND")
+      (pin "3" "UART_TX")
+      (pin "4" "UART_RX")
+      (pin "5" "OUT")
+    )
+  )
+
+  ;; LD2410C decoupling
+  (symbol
+    (lib_id "Device:C")
+    (at 215 140 0)
+    (uuid "a1000001-0001-0001-0001-000000000031")
+    (property "Reference" "C9" (at 217 138 0))
+    (property "Value" "10uF" (at 217 142 0))
+    (property "Footprint" "Capacitor_SMD:C_0805_2012Metric" (at 215 140 0))
+  )
+
+  ;; =====================================================
+  ;; PIR SENSOR - AM312
+  ;; =====================================================
+
+  (text "AM312 PIR Motion Sensor"
+    (at 170 170 0)
+    (effects (font (size 3 3) (thickness 0.5)) (justify left))
+  )
+
+  ;; AM312 connector (3-pin: VCC, OUT, GND)
+  (symbol
+    (lib_id "Connector_Generic:Conn_01x03")
+    (at 200 190 0)
+    (uuid "a1000001-0001-0001-0001-000000000040")
+    (property "Reference" "J4" (at 200 182 0))
+    (property "Value" "AM312_PIR" (at 200 184 0))
+    (property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical" (at 200 190 0))
+    (property "Description" "AM312 mini PIR sensor, 3.3V, digital output" (at 200 190 0))
+    (pin_names
+      (pin "1" "VCC_3V3")
+      (pin "2" "OUT")
+      (pin "3" "GND")
+    )
+  )
+
+  ;; PIR pulldown resistor
+  (symbol
+    (lib_id "Device:R")
+    (at 215 190 0)
+    (uuid "a1000001-0001-0001-0001-000000000041")
+    (property "Reference" "R2" (at 217 190 0))
+    (property "Value" "10K" (at 219 190 0))
+    (property "Footprint" "Resistor_SMD:R_0402_1005Metric" (at 215 190 0))
+    (property "JLCPCB" "C25744" (at 215 190 0))
+  )
+
+  ;; =====================================================
+  ;; I2C BUS - SHT41 + BH1750
+  ;; =====================================================
+
+  (text "I2C Sensors: SHT41 (Temp/Humidity) + BH1750 (Light)"
+    (at 25 220 0)
+    (effects (font (size 3 3) (thickness 0.5)) (justify left))
+  )
+
+  ;; SHT41 Temperature & Humidity Sensor
+  (symbol
+    (lib_id "Sensor:SHT4x")
+    (at 60 250 0)
+    (uuid "a1000001-0001-0001-0001-000000000050")
+    (property "Reference" "U6" (at 60 238 0))
+    (property "Value" "SHT41" (at 60 240 0))
+    (property "Footprint" "Sensor_Humidity:Sensirion_DFN-4-1EP_1.5x1.5mm_P0.8mm_EP0.5x0.5mm" (at 60 250 0))
+    (property "JLCPCB" "C2911456" (at 60 250 0))
+    (property "Description" "Digital temp/humidity sensor, ±0.2°C, I2C, 1.5x1.5mm" (at 60 250 0))
+  )
+
+  ;; SHT41 decoupling
+  (symbol
+    (lib_id "Device:C")
+    (at 80 250 0)
+    (uuid "a1000001-0001-0001-0001-000000000051")
+    (property "Reference" "C10" (at 82 248 0))
+    (property "Value" "100nF" (at 82 252 0))
+    (property "Footprint" "Capacitor_SMD:C_0402_1005Metric" (at 80 250 0))
+  )
+
+  ;; BH1750 Ambient Light Sensor
+  (symbol
+    (lib_id "Sensor_Optical:BH1750FVI")
+    (at 60 285 0)
+    (uuid "a1000001-0001-0001-0001-000000000052")
+    (property "Reference" "U7" (at 60 273 0))
+    (property "Value" "BH1750FVI" (at 60 275 0))
+    (property "Footprint" "Package_SO:WSOF-6_1.4x1.7mm_P0.5mm" (at 60 285 0))
+    (property "JLCPCB" "C78960" (at 60 285 0))
+    (property "Description" "Ambient light sensor, 1-65535 lux, I2C, 1.6x1.6mm" (at 60 285 0))
+  )
+
+  ;; BH1750 decoupling
+  (symbol
+    (lib_id "Device:C")
+    (at 80 285 0)
+    (uuid "a1000001-0001-0001-0001-000000000053")
+    (property "Reference" "C11" (at 82 283 0))
+    (property "Value" "100nF" (at 82 287 0))
+    (property "Footprint" "Capacitor_SMD:C_0402_1005Metric" (at 80 285 0))
+  )
+
+  ;; I2C pull-up resistors
+  (symbol
+    (lib_id "Device:R")
+    (at 40 235 0)
+    (uuid "a1000001-0001-0001-0001-000000000054")
+    (property "Reference" "R3" (at 42 235 0))
+    (property "Value" "4.7K" (at 44 235 0))
+    (property "Footprint" "Resistor_SMD:R_0402_1005Metric" (at 40 235 0))
+    (property "JLCPCB" "C25900" (at 40 235 0))
+    (property "Description" "I2C SDA pull-up" (at 40 235 0))
+  )
+  (symbol
+    (lib_id "Device:R")
+    (at 48 235 0)
+    (uuid "a1000001-0001-0001-0001-000000000055")
+    (property "Reference" "R4" (at 50 235 0))
+    (property "Value" "4.7K" (at 52 235 0))
+    (property "Footprint" "Resistor_SMD:R_0402_1005Metric" (at 48 235 0))
+    (property "JLCPCB" "C25900" (at 48 235 0))
+    (property "Description" "I2C SCL pull-up" (at 48 235 0))
+  )
+
+  ;; =====================================================
+  ;; MOUNTING HOLES
+  ;; =====================================================
+
+  (symbol
+    (lib_id "Mechanical:MountingHole")
+    (at 250 260 0)
+    (uuid "a1000001-0001-0001-0001-000000000060")
+    (property "Reference" "H1" (at 252 258 0))
+    (property "Value" "MountingHole" (at 252 262 0))
+    (property "Footprint" "MountingHole:MountingHole_2.2mm_M2_Pad" (at 250 260 0))
+  )
+  (symbol
+    (lib_id "Mechanical:MountingHole")
+    (at 260 260 0)
+    (uuid "a1000001-0001-0001-0001-000000000061")
+    (property "Reference" "H2" (at 262 258 0))
+    (property "Value" "MountingHole" (at 262 262 0))
+    (property "Footprint" "MountingHole:MountingHole_2.2mm_M2_Pad" (at 260 260 0))
+  )
+)