moisture.yaml

esphome:
  name: wemos_moisture
  platform: ESP8266
  board: d1_mini_lite
  on_boot:
    then: # This ensures no sensors are getting power
      - output.turn_off: plant1Output
      - output.turn_off: plant2Output

wifi:
  ssid: !secret ssid
  password: !secret wifi_password

api:

logger:

ota:

# These define the GPIO that are hooked up to the positive pin on the individual sensors
output:
  - platform: gpio
    pin: D0
    id: plant1Output
  - platform: gpio
    pin: D1
    id: plant2Output


# Dry 0.7 - taken from in the air, probably should do it directly in dry soil
# Wet 0.264 - taken from in a glass of water, probably should do it directly in saturated soil
sensor:
# This is the actual reading of the various sensors
  - platform: adc 
    pin: A0
    id: moisture
    update_interval: 0.1s
    internal: true # Don't expose this sensor to HA, the template sensors will do that
    accuracy_decimals: 1
    filters:
      - sliding_window_moving_average: # averages the last 10 results, probably overkill
          window_size: 10
          send_every: 10
      - lambda: |-
          if (x > 0.7) { 				// if over 0.7 volts, we are dry
            return 0;
          } else if (x < 0.264) { 			// if under 0.264 volts, we are fully saturated
            return 100;
          } else {
            return (0.7-x) / (0.7-0.264) * 100.0; 	// use a linear fit for any values in between
          }
# actual sensors reported to Home Assistant, pull the value from the internal ADC sensor
  - platform: template
    name: "Plant 1 Soil Saturation"
    id: plant1
    unit_of_measurement: "% Saturation"
    icon: "mdi:water-percent"
    update_interval: never
    accuracy_decimals: 0
    lambda: |-
      return id(moisture).state;
  - platform: template
    name: "Plant 2 Soil Saturation"
    id: plant2
    unit_of_measurement: "% Saturation"
    icon: "mdi:water-percent"
    update_interval: never
    accuracy_decimals: 0
    lambda: |-
      return id(moisture).state;

# This is the code that runs over and over again turning on the correct sensors then updating the template sensors
interval:
  - interval: 15s # if you add more outputs, increase this time as appropriate
    then:
      - output.turn_on: plant1Output # turn on sensor 1
      - delay: 5s # let sensor 1's reading settle
      - component.update: plant1 # update sensor 1's reading in HA
      - output.turn_off: plant1Output # stop powering sensor 1
      - output.turn_on: plant2Output # turn on sensor 2
      - delay: 5s # let sensor 2's reading settle
      - component.update: plant2 # update sensor 2's reading in HA
      - output.turn_off: plant2Output # stop powering sensor 2