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presence-sensor/PIN_MAPPING.md
root 0240020cd2 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

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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+).

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