Analog sensor power pin operation

ESPHome
1

Hi. I am struggling to figure out how to do following: turn on digital pin, wait 1ms, read analog sensor, turn off digital pin. Repeat every 5min. So far i have managed to get digital pin to trigger on/off, cannot read analog pin while it is powered. Thank you for any suggestions.

2

This is my best bet so far, which doesn’t work:

output:
  - platform: gpio
    pin: D5
    id: power_pin
  - platform: gpio
    pin: D7
    id: gnd_pin
   

switch:
  - platform: output
    name: "pos"
    id: pos
    output: power_pin
    on_turn_on:
      then:
        - delay: 1000ms
        - lambda: |-
           id(analog_sensor).state ;
        - switch.turn_off: pos

sensor:
  - platform: adc
    pin: A0
    name: "Analog Sensor"
    id: analog_sensor
    update_interval: 5s

It gives this statement on compiling:

/config/esphome/rain-sens.yaml: In lambda function:
/config/esphome/rain-sens.yaml:52:22: warning: statement has no effect [-Wunused-value]
   52 |            id(analog_sensor).state ;
3

Your lambda call isn’t triggering a read of the analogue sensor — it’s simply referencing its value and then doing nothing with it, hence the warning message.

I think you want to use the .publish_state() call (here) in combination with a much higher update_interval on the sensor — perhaps with a filter on it to get rid of any reading that are taken whilst the thing powered by D7 is off.

4

Then i’m getting following error:

/config/esphome/rain-sens.yaml: In lambda function:
/config/esphome/rain-sens.yaml:52:22: error: invalid use of non-static member function 'void esphome::sensor::Sensor::publish_state(float)'
5

From what code?

6 
output:

  - platform: gpio

    pin: D5

    id: power_pin

  - platform: gpio

    pin: D7

    id: gnd_pin

   

switch:

  - platform: output

    name: "pos"

    id: pos

    output: power_pin

    on_turn_on:

      then:

        - delay: 1000ms

        - lambda: |-

           id(analog_sensor).publish_state ;

        - switch.turn_off: pos

sensor:

  - platform: adc

    pin: A0

    name: "Analog Sensor"

    id: analog_sensor

    update_interval: 5s
7

It’d need to be publish_state() as it’s a function.

Try this instead, using component.update documented here:

    on_turn_on:
      then:
        - delay: 1000ms
        - component.update: analog_sensor
        - switch.turn_off: pos
8

Thank you very, very much vise man! This works.