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

Hello, could you tell me what sensor they use to measure the humidity in the soil?
I think I'm not getting the right humidity values

Thank you

It's not really a sensor as far as I know. It's simply a resistor effectively so you need to measure it yourself. The 2.95 and 1.1 correspond to my values for dry and in a glass of water.

Brilliant, thank you for sharing, I was trying to read adc and always getting 1.1v, I guess attenuation: 11db was the issue on my end

adding this saved the day
attenuation: 11db
unit_of_measurement: '%'
filters:
# 1.1v = in water
# 2.94v = dry
lambda: |-
return (2.95 - x) * 100.0 / (2.95 - 1.1);

Three questions:

1. Has anybody figured out how to translate to conductivity? I'm trying to make the sensor compliant with the plan sensor in hass.
2. Does the wake button actaully do anything the way it's wired in this yaml-file?
3. Does the circuitry charge the battery when powered via the USB-C connector?

Thank you for a nice example!

Warmly, Per

1. Has anybody figured out how to translate to conductivity? I'm trying to make the sensor compliant with the plan sensor in hass.

Intuitively (can't say I really bother with it myself) you could scale it similarly to the humidity sensor.
Open air should be 0%
A copper wire between the leads should be 100%

2. Does the wake button actaully do anything the way it's wired in this yaml-file?

You can detect the state in home assistant, but it's not currently doing anything beyond that.

3. Does the circuitry charge the battery when powered via the USB-C connector?

I guess it depends on the board you have. I'm currently using several of these with batteries and they appear to be charging through usb-c: https://www.aliexpress.com/item/32818803204.html

The big problem is the power drain. Even with deep sleep enabled I haven't been getting more than 3 days or so. If you want battery powered devices you should probably go for your own custom firmware instead. Andreas Spiess covered this recently: https://www.youtube.com/watch?v=nHaFM0tKOvY

Thank you for the quick reply!

It would be nice to allow waking it up from deep sleep by pressing the button. Do you know how to do that?

Batteries not lasting more than 3 days is a dissapointment. I'll look into the custom firmware option.

It should be possible by setting the wakeup pin: https://esphome.io/components/deep_sleep.html#configuration-variables

In theory it would look something like this:

deep_sleep:
  run_duration: 1m
  wakeup_pin: GPIO35

In that case your battery life should be pretty good but I've done very little testing so far.

GPIO16 is the blue LED on the older pocket_32 version there are 2 other LEDs 1 status and 1 always on Green. does anybody know its GPIO pin? i know its not gpio21 i found a reference somewhere that said 21 might work, it didnt.

has anyone used the model with the pump just got one here for a client trying to work out how to trigger the pump

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