ESPHome code for moisture sensors

moisture-1.yml

# Reads analog data using an ads1115. Three moisture sensors and a battery sensor.
# Goes to sleep for an hour at a time.
# Uses a helper input_boolean to keep it from going to sleep, in case you want to update it.

esphome:
  name: moisture-1
  platform: ESP32
  board: esp32dev
  on_boot:
    then:
      - script.execute: consider_deep_sleep

# Enable logging
#logger:

# Enable Home Assistant API
api:

ota:
  password: "ota-password"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  fast_connect: true
  domain: .mylocal

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "moisture-1 Fallback Hotspot"
    password: !secret fallback_wifi_password

captive_portal:

#
# Run for 10 seconds (see delay in script)
# Deep sleep for 1 hour
#
deep_sleep:
  id: deep_sleep_control
  sleep_duration: 1h

# the ads1115 is i2c
i2c:
  sda: 21
  scl: 22
  scan: true

ads1115:
  - address: 0x48

globals:
  # Value to consider completely dry. Auto-calibrated.
  - id: dryValue
    type: double
    restore_value: yes
    initial_value: '1.8'
  # Value to consider completely wet. Auto-calibrated.
  - id: wetValue
    type: double
    restore_value: yes
    initial_value: '1.8'
  # Maximum battery voltage (observed). Auto-calibrated.
  - id: batteryMax
    type: double
    restore_value: yes
    initial_value: '8.1'
  # Minimum acceptable battery voltage. NOT auto-calibrated.
  # I'm assuming 2.75 volts as the minimum voltage for a single
  # cell. I'm using two cells in series, so I assume a 5.5v
  # minimum voltage (reporting 0% to HA).
  - id: batteryMin
    type: double
    restore_value: yes
    initial_value: '6.7'
  #
  # We are using a voltage divider to reduce the voltage from the
  # two 18650 cells down into a range the ADS1115 can read.
  # This is the factor to multiply to get back to (approximate)
  # actual voltage.
  #
  - id: voltageFactor
    type: double
    restore_value: yes
    initial_value: '3.2'

sensor:
  - platform: ads1115
    multiplexer: 'A0_GND'
    # Providing 3.3v to the ADC so selecting the 4.096 gain
    gain: 4.096
    name: "moisture_1_s0"
    update_interval: 3s
    unit_of_measurement: "%"
    filters:
      - lambda: !lambda |-
          if (id(dryValue) < x) {
            // Auto-calibrate dryValue
            id(dryValue) = x;
          }
          if (id(wetValue) > x) {
          // Auto-calibrate wetValue
            id(wetValue) = x;
          }
          // Scale x: dryValue->wetValue, 0->100
          return (x - id(dryValue)) * (100 - 0) / (id(wetValue) - id(dryValue)) + 0;
  - platform: ads1115
    multiplexer: 'A1_GND'
    # Providing 3.3v to the ADC so selecting the 4.096 gain
    gain: 4.096
    name: "moisture_1_s1"
    update_interval: 3s
    unit_of_measurement: "%"
    filters:
      - lambda: !lambda |-
          if (id(dryValue) < x) {
            // Auto-calibrate dryValue
            id(dryValue) = x;
          }
          if (id(wetValue) > x) {
          // Auto-calibrate wetValue
            id(wetValue) = x;
          }
          // Scale x: dryValue->wetValue, 0->100
          return (x - id(dryValue)) * (100 - 0) / (id(wetValue) - id(dryValue)) + 0;
  - platform: ads1115
    multiplexer: 'A2_GND'
    # Providing 3.3v to the ADC so selecting the 4.096 gain
    gain: 4.096
    name: "moisture_1_s2"
    update_interval: 3s
    unit_of_measurement: "%"
    filters:
      - lambda: !lambda |-
          if (id(dryValue) < x) {
            // Auto-calibrate dryValue
            id(dryValue) = x;
          }
          if (id(wetValue) > x) {
          // Auto-calibrate wetValue
            id(wetValue) = x;
          }
          // Scale x: dryValue->wetValue, 0->100
          return (x - id(dryValue)) * (100 - 0) / (id(wetValue) - id(dryValue)) + 0;
  #
  # The device is being powered by a pair of 18650
  # with a maximum voltage of about 8.2 volts?
  # I use a ~1/3 voltage divider to bring the votage down into
  # the range the ADS1115 can handle with a 3.3v reference.
  # See the global named voltageFactor.
  #
  - platform: ads1115
    multiplexer: 'A3_GND'
    # Providing 3.3v to the ADC so selecting the 4.096 gain
    gain: 4.096
    name: "moisture_1_battery"
    update_interval: 3s
    filters:
      - lambda: !lambda |-
          return x * id(voltageFactor);
  - platform: ads1115
    multiplexer: 'A3_GND'
    # Providing 3.3v to the ADC so selecting the 4.096 gain
    gain: 4.096
    name: "moisture_1_battery_percent"
    unit_of_measurement: "%"
    update_interval: 3s
    filters:
      - lambda: !lambda |-
          double v = x * id(voltageFactor);
          if (v > id(batteryMax)) {
            // Auto-calibrate maximum voltage
            id(batteryMax) = v;
          }
          return (v - id(batteryMin)) * (100 - 0) / (id(batteryMax) - id(batteryMin)) + 0;

# Sensor in Home Automation that we are using to 
# stop Deep Sleep so we can watch the logs or
# perform OTA.
binary_sensor:
  - platform: homeassistant
    id: prevent_deep_sleep
    entity_id: input_boolean.prevent_deep_sleep

# Every 15 this script seconds check if "Prevent Deep Sleep" 
# isn't "On", go to deep sleep sleep.
# During that 15 seconds normal operations occur including
# sending sensor data. 
# If this time is too small. prevent_deep_sleep won't 
# necessarily be updated and data may not be sampled/sent.
script:
  - id: consider_deep_sleep
    mode: queued
    then:
      - delay: 15s
      - if:
          condition:
            binary_sensor.is_on: prevent_deep_sleep
          then:
            - logger.log: "Staying awake because Prevent Deep Sleep is on."
          else:
            - logger.log: "Taking a nap."
            - deep_sleep.enter: deep_sleep_control
      - script.execute: consider_deep_sleep