esp32_higrow_plant_moisture_sensor.yaml

esphome:
  name: plant_moisture
  platform: ESP32
  board: esp32dev

wifi:
  ssid: "spam"
  password: "eggs"

# Enable logging
logger:

# Enable Home Assistant API
api:
  password: "password"

ota:
  password: "password"

sensor:
  - platform: dht
    pin: 22
    model: DHt11
    temperature:
      name: "plant_0_temperature"
    humidity:
      name: "plant_0_humidity"
  - platform: adc
    pin: 32
    name: "plant_0_soil_moisture"
    attenuation: 11db
    unit_of_measurement: '%'
    filters:
      # 1.1v = in water
      # 2.94v = dry
      lambda: |-
        return (2.95 - x) * 100.0 / (2.95 - 1.1);

ttgo_higrow_esp32_dht11_sensor.yaml

# TTGO Higrow version with battery and deep sleep enabled. Battery life not tested yet
esphome:
  name: higrow_00
  platform: ESP32
  board: lolin_d32
  on_shutdown:
    then:
      - switch.turn_off: spower

switch:
  - platform: gpio
    pin: GPIO4
    name: "Sensor Power"
    id: spower
    restore_mode: ALWAYS_ON
    internal: true
    setup_priority: 1000

binary_sensor:
  - platform: gpio
    pin: 
      number: GPIO35
      mode: INPUT_PULLUP
      inverted: True
    name: "Wake Button"

i2c:
  sda: 25
  scl: 26
  scan: True
  id: bus_a
  setup_priority: -200

deep_sleep:
  run_duration: 10s
  sleep_duration: 15min

sensor:
  - platform: dht
    model: dht11
    pin:
      number: 16
      mode: input
    temperature:
      name: "HiGrow1 Temperature"
    humidity:
      name: "HiGrow1 Humidity"
    update_interval: 15min
    setup_priority: -100
    
  - platform: adc
    pin: GPIO32
    name: "HiGrow1 Soil"
    update_interval: 15min
    attenuation: 11db
    unit_of_measurement: '%'
    filters:
      - calibrate_linear:
          # Map 0.0 (from sensor) to 0.0 (true value)
          - 3.08 -> 0.0
          - 1.42 -> 100.0
    
  - platform: adc
    pin: 33
    name: "HiGrow1 Battery"
    attenuation: 6db
    unit_of_measurement: 'V'
    update_interval: 15min
    filters:
      - calibrate_linear:
          # Map 0.0 (from sensor) to 0.0 (true value)
          - 0.0 -> 0.0
          - 2.06 -> 1.89
      - lambda: return x * 2.0;
        
  - platform: adc
    pin: GPIO34
    name: "HiGrow1 Salt"
    update_interval: 15min
    unit_of_measurement: '%'
    accuracy_decimals: 4
    filters:
      - calibrate_linear:
          # Map 0.0 (from sensor) to 0.0 (true value)
          - 0.0 -> 0.0
          - 1.1 -> 100.0
    
  - platform: bh1750
    i2c_id: bus_a
    name: "BH1750 Illuminance"
    address: 0x23
    update_interval: 15min
    setup_priority: -300

I made my first automated esphome github build action for the LilyGo T-Higrow plant sensor that monitors your plant and is also a bluetooth proxy hub. For me it has been a great learning expierence and I hope I can make someones day with this.

If you want to flash the sensor just connect it to your computer/laptop and with chrome go to:
https://bruvv.github.io/LILYGO-T-Higrow-Esphome/
and follow the instructions.

Source code:
https://github.com/bruvv/LILYGO-T-Higrow-Esphome

That looks very nice @bruvv!

Wow, thanks a lot. Which GPIO (PIN) can I use for a relay to control a waterpump? And do you have a pinout. I don't know which pin is which GPIO.

Wow, thanks a lot. Which GPIO (PIN) can I use for a relay to control a waterpump? And do you have a pinout. I don't know which pin is which GPIO.

Maybe you have a different version but mine includes the pin numbers right next to the pins