Esphome 控制普通电风扇

近来天气渐热。遂购入一台普通可充电小风扇。此风扇的电源和风速调节只有一个按钮。且无遥控器。刚好家里还有几片剩余没有用的ESP12 。试试能不能改装一下远程控制，接入home-assisstant。

因为此风扇自带电池。内部按钮是个未知的MCU控制的，测量发现MCU的供电电压是3.6v左右。也可以用来给ESP供电。按钮是低电平触发。所以只要用ESP控制GPIO给按钮低电平就可以控制这个风扇了。

连接电路如下：

ESPHOME还不支持Fan Template。其Binary-Fan又只能通过一个GPIO来控制开关。此风扇的开关实际上是个循环的速度调节器，从0-5档。所以我需要一个fake的GPIO什么也不做。在on_turn_on和on_turn_off时用lambda来控制连接风扇按钮的GPIO。开机简单，直接trigger一下GPIO就OK。关机要连续trigger直到切换到0 。所以加了个binary-sensor GPIO检测开机状态。lambda通过for + if开控制实现关机。

fan:
  - platform: binary
    output: fake_out
    name: Fan
    restore_mode: RESTORE_DEFAULT_OFF
    on_turn_on:
      then:
        - logger.log: "Turn On Fan"
        - script.execute: button_press
        - script.wait: button_press
        - logger.log: "Turn On Fan End"
    on_turn_off:
      then:
        - logger.log: "Turn Off Fan"
        - script.execute: always_press_until_off
        - script.wait: always_press_until_off
        - logger.log: "Turn Off Fan End"

binary_sensor: 
  - platform: gpio
    pin: GPIO5.  # 连接检测点，检测电源状态
    id: fan_power
    name: "Fan Power"
    filters:
      - delayed_on: 10ms


output:
  - id: output_io
    platform: gpio
    pin: GPIO14
    inverted: true
  - platform: template
    id: fake_out # 什么都不做
    type: float
    write_action:
      - logger.log: "NoThing"

script:
  - id: button_press
    then:
      - logger.log: "Press Start"
      - output.turn_on: output_io
      - delay: 200ms
      - output.turn_off: output_io
      - logger.log: "Press End"
  - id: always_press_until_off
    then:
      - repeat:
          count: 4
          then:
            - if:
                condition:
                  binary_sensor.is_on: fan_power
                then:
                  - logger.log: "Press Start"
                  - output.turn_on: output_io
                  - delay: 100ms
                  - output.turn_off: output_io
                  - delay: 500ms # 电源关机有一定延迟
                  - logger.log: "Press End"
                else:
                  - logger.log: "Check Else"

增加调节风速的按钮，这个比较简单：

button:
  - platform: template
    name: "Fan Speed +"
    on_press:
        - script.execute: button_press
        - script.wait: button_press

打开web server测试效果

web_server:

测试OK后打开api，接入home-assisstant。

api:
  password: "PASSWORD"

因为风扇是电池供电，为了防止esp把电池耗尽，加入一点休眠机制：

esphome:
  name: fan
  platform: ESP8266
  board: esp12e
  platformio_options:
    board_build.ldscript: eagle.flash.2m.ld
  on_loop:
    then:
      - if:
          condition:
            sensor.in_range:
              id: vcc
              below: 3.82
          then:
            - logger.log: "Enter Deep Sleep"
            - deep_sleep.enter:
                id: deep_sleep_1
                sleep_duration: 20min
          else:
            - deep_sleep.prevent: deep_sleep_1

sensor:
  - platform: adc
    pin: VCC
    id: vcc
    name: "Fan VCC"
    update_interval: 100ms
 
deep_sleep:
  id: deep_sleep_1
  run_duration: 60s
  sleep_duration: 20min

完整代码如下：

https://gist.github.com/yufeikang/aa21ad464a992d4b47f1b0f7ed1ebb79