ESPHome - save/restore counters for restart

substitutions:
  name_1: main
  friendly_name_1: "Licznik główny"
  name_2: garden
  friendly_name_2: "Licznik ogrodowy"

esphome:
  name: esp-woda
  comment: Odczyt liczników wody
  on_boot:
    then:
      - script.execute: restore_states
  on_shutdown:
    then:
      - script.execute: backup_states

# Enable Home Assistant API
api:
  services:
    - service: backup_data
      then:
        - script.execute: backup_states
    - service: restore_data
      then:
        - script.execute: restore_states
    - service: set_${name_1}_water_counter
      variables:
        new_total: int
      then:
        - pulse_counter.set_total_pulses:
            id: ${name_1}_water_pulse_counter
            value: !lambda 'return new_total;'
    - service: set_${name_2}_water_counter
      variables:
        new_total: int
      then:
        - pulse_counter.set_total_pulses:
            id: ${name_2}_water_pulse_counter
            value: !lambda 'return new_total;'

#################################################################
# Globals
globals:
  - id: ${name_1}_water_total_backup
    type: int
    restore_value: true
  - id: ${name_2}_water_total_backup
    type: int
    restore_value: true

#################################################################
# Scripts
script:
- id: backup_states
  then:
    - globals.set:
        id: ${name_1}_water_total_backup
        value: !lambda 'return id(${name_1}_water_total).state;'
    - globals.set:
        id: ${name_2}_water_total_backup
        value: !lambda 'return id(${name_2}_water_total).state;'
- id: restore_states
  then:
    - pulse_counter.set_total_pulses:
        id: ${name_1}_water_pulse_counter
        value: !lambda 'return id(${name_1}_water_total_backup);'
    - pulse_counter.set_total_pulses:
        id: ${name_2}_water_pulse_counter
        value: !lambda 'return id(${name_2}_water_total_backup);'

#################################################################
# Buttons
button:
  - platform: template
    name: "Backup counters"
    icon: "mdi:content-save-all"
    on_press:
      - script.execute: backup_states

  - platform: template
    name: "Restore backup"
    icon: "mdi:backup-restore"
    on_press:
      - script.execute: restore_states
#################################################################
# Sensors
sensor:
  - platform: pulse_counter
    name: '${friendly_name_1} - przepływ'
    id: ${name_1}_water_pulse_counter
    pin: GPIO13
    unit_of_measurement: "L/min"
    accuracy_decimals: 0
    update_interval: 1min
    total:
      name: '${friendly_name_1}'
      id: ${name_1}_water_total
      unit_of_measurement: 'L'
      accuracy_decimals: 0
      icon: "mdi:water"
      device_class: water
      state_class: total

  - platform: pulse_counter
    name: '${friendly_name_2} - przepływ'
    id: ${name_2}_water_pulse_counter
    pin: GPIO14
    unit_of_measurement: "L/min"
    accuracy_decimals: 0
    update_interval: 1min
    total:
      name: '${friendly_name_2}'
      id: ${name_2}_water_total
      unit_of_measurement: 'L'
      accuracy_decimals: 0
      icon: "mdi:water"
      device_class: water
      state_class: total

# Check battery level of 18650 Li-Ion (3.7V) connected to the LOLIN32 by using voltage divider
# Resistors used: R1=47k and R2=100k, so max Vout is 4,2*R2/(R1+R2) == 2.857 (max 3.3v is allowed)
# see: https://www.mischianti.org/2019/06/15/voltage-divider-calculator-and-application
#ESP32: GPIO32 through GPIO39 can be used.
  - platform: adc
    id: battery_voltage
    pin: GPIO34
    attenuation: auto
    name: Battery Voltage
    update_interval: 15min
    accuracy_decimals: 2
    filters:
      - multiply: 1.47 #revert to real voltage
      - delta: 0.1 #send values if changed
#Convert the Voltage to the battery level (%)
  - platform: copy
    source_id: battery_voltage
    id: battery_level
    icon: "mdi:battery"
    name: Battery Level
    device_class: battery
    unit_of_measurement: '%'
    accuracy_decimals: 1
    filters:
      - calibrate_linear:
      # Map from voltage to Battery level
          - 3.0 -> 0 #min for ESP32
          - 4.2 -> 100 #max for 18650 3,7v battery
      #Handle/cap boundaries
      - lambda: |
          if (x < 0) return 0;
          else if (x > 100) return 100;
          else return (x);
      - delta: 1 #send values if changed