Add PoE variant with W5500 Ethernet and 802.3af power

- W5500 SPI Ethernet controller for wired connectivity
- Silvertel Ag9905MT PoE PD module (48V to 5V)
- RJ45 connector with integrated magnetics
- Higher camera resolution (1024x768 vs 800x600) using wired bandwidth
- WiFi fallback if Ethernet disconnected
- Separate BOM, pin mapping, ESPHome config
- 3D-printable enclosure (50x40mm, larger for RJ45)

poe-variant/esphome-presence-sensor-poe.yaml

@@ -0,0 +1,193 @@
+substitutions:
+  name: presence-sensor-poe
+  friendly_name: Presence Sensor PoE
+
+esphome:
+  name: ${name}
+  friendly_name: ${friendly_name}
+  platformio_options:
+    board_build.flash_mode: dio
+    board_build.arduino.memory_type: qio_opi
+
+esp32:
+  board: esp32-s3-devkitc-1
+  framework:
+    type: esp-idf
+  flash_size: 16MB
+
+psram:
+  mode: octal
+  speed: 80MHz
+
+logger:
+  level: INFO
+
+api:
+  encryption:
+    key: !secret api_key
+
+ota:
+  - platform: esphome
+    password: !secret ota_password
+
+# ==========================================
+# ETHERNET - W5500 SPI (primary network)
+# ==========================================
+ethernet:
+  type: W5500
+  clk_pin: GPIO35
+  mosi_pin: GPIO34
+  miso_pin: GPIO33
+  cs_pin: GPIO36
+  interrupt_pin: GPIO37
+  reset_pin: GPIO42
+  clock_speed: 25MHz
+
+# WiFi as fallback only (if Ethernet cable disconnected)
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+  ap:
+    ssid: "${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
+  # PoE = wired = more bandwidth, can push higher quality
+  resolution: 1024x768
+  max_framerate: 15fps
+  idle_framerate: 0.5fps
+  jpeg_quality: 10
+  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:
+  - platform: ld2410
+    has_target:
+      name: Presence
+      id: ld2410_presence
+    has_moving_target:
+      name: Moving Target
+    has_still_target:
+      name: Still Target
+
+  - platform: gpio
+    pin:
+      number: GPIO38
+      mode: INPUT
+    name: Motion
+    id: pir_motion
+    device_class: motion
+    filters:
+      - delayed_off: 10s
+
+  - 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:
+  - 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
+
+  - platform: sht4x
+    temperature:
+      name: Temperature
+      accuracy_decimals: 1
+      filters:
+        - offset: -1.5
+    humidity:
+      name: Humidity
+      accuracy_decimals: 1
+    address: 0x44
+    update_interval: 30s
+    heater_max_duty: 0.0
+
+  - platform: bh1750
+    name: Illuminance
+    address: 0x23
+    measurement_duration: 69
+    update_interval: 10s
+
+  - platform: uptime
+    name: Uptime
+
+light:
+  - platform: status_led
+    name: Status LED
+    pin: GPIO40
+
+button:
+  - platform: restart
+    name: Restart
+  - platform: factory_reset
+    name: Factory Reset
+    disabled_by_default: true
+
+text_sensor:
+  - platform: ethernet_info
+    ip_address:
+      name: IP Address
+  - platform: version
+    name: ESPHome Version