Added OXT WiFi-3CH

src/docs/devices/OXT-WiFi-3CH/index.md

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+---
+title: OXT Wi-Fi 3CH
+date-published: 2024-09-25
+type: relay
+standard: global
+board: bk72xx
+difficulty: 4
+---
+
+## General Notes
+
+This is Polish brand based on a other Chinese product. Based on Tuya CB3S Board.
+
+## Product Images
+
+![main view](/device.jpg "DEVICE")
+![pcb](/pcb.jpg "PCB")
+
+## Programming
+
+Solder USB TTL wires like below
+
+![soldering](/soldering.jpg "soldering")
+
+To enter bootloader mode, ground CEN pin and power device. I used https://github.com/libretiny-eu/ltchiptool to program it
+
+## GPIO Pinout
+
+### OXT Wi-Fi 3CH - PCB ZH-Z02-A REV:C
+
+| Pin | Function   |
+|-----|------------|
+| P7  | Relay #1   |
+| P8  | Relay #2   |
+| P9  | Relay #3   |
+| P14 | Status LED |
+
+## Basic Configuration
+
+```yaml
+substitutions:
+  device_name: oxt-3ch
+
+esphome:
+  name: ${device_name}
+  friendly_name: ${device_name}
+
+bk72xx:
+  board: cb3s
+
+logger:
+
+captive_portal:
+
+status_led:
+  pin:
+    number: GPIO9
+    inverted: true
+
+switch:
+  - platform: gpio
+    pin: P7
+    id: relay1
+  - platform: gpio
+    pin: P8
+    id: relay2
+  - platform: gpio
+    pin: P9
+    id: relay3
+
+binary_sensor:
+  - platform: gpio
+    pin:
+      number: P6
+      mode: INPUT_PULLUP
+      inverted: True
+    name: ${device_name} switch 1
+    on_press:
+      - light.toggle: relay1
+    on_release:
+      - light.toggle: relay1
+  - platform: gpio
+    pin:
+      number: P24
+      mode: INPUT_PULLUP
+      inverted: True
+    name: ${device_name} switch 2
+    on_press:
+      - light.toggle: relay2
+    on_release:
+      - light.toggle: relay2
+  - platform: gpio
+    pin:
+      number: P26
+      mode: INPUT_PULLUP
+      inverted: True
+    name: ${device_name} switch 3
+    on_press:
+      - light.toggle: relay3
+    on_release:
+      - light.toggle: relay3
+
+```