esphome:
  name: pt100-4ch

esp32:
  board: esp32-s3-devkitc-1
  framework:
    type: esp-idf

logger:
api:
ota:
  - platform: esphome

wifi:
  ssid: "YOUR_WIFI_SSID"
  password: "YOUR_WIFI_PASSWORD"

external_components:
  - source:
      type: local
      path: ../components
    components: [nx3l4051, nx3l4051_max31865]

# The two NX3L4051 chips share these select lines. The 20ms delay lets
# the analog paths settle before starting a MAX31865 conversion.
nx3l4051:
  - id: pt100_mux
    pin_s1: GPIO7
    pin_s2: GPIO21
    pin_s3: LOW
    delay: 20ms

sensor:
  - platform: nx3l4051_max31865
    id: pt100_reader
    mux_id: pt100_mux
    internal: true
    clk_pin: GPIO11
    mosi_pin: GPIO10
    miso_pin: GPIO12
    cs_pin: GPIO14
    reference_resistance: 400 ohm
    rtd_nominal_resistance: 100 ohm
    rtd_wires: 3
    mains_filter: 50 Hz
    update_interval: never

  - platform: template
    id: pt100_1
    name: "PT100 1"
    unit_of_measurement: "°C"
    device_class: temperature
    state_class: measurement
    accuracy_decimals: 2

  - platform: template
    id: pt100_2
    name: "PT100 2"
    unit_of_measurement: "°C"
    device_class: temperature
    state_class: measurement
    accuracy_decimals: 2

  - platform: template
    id: pt100_3
    name: "PT100 3"
    unit_of_measurement: "°C"
    device_class: temperature
    state_class: measurement
    accuracy_decimals: 2

  - platform: template
    id: pt100_4
    name: "PT100 4"
    unit_of_measurement: "°C"
    device_class: temperature
    state_class: measurement
    accuracy_decimals: 2

globals:
  - id: pt100_channel
    type: uint8_t
    restore_value: no
    initial_value: "0"

interval:
  - interval: 10s
    then:
      - repeat:
          count: 4
          then:
            - nx3l4051.select:
                id: pt100_mux
                channel: !lambda "return id(pt100_channel);"
            - component.update: pt100_reader
            # MAX31865 completes a 50Hz one-shot conversion asynchronously in
            # at most 66ms. This non-blocking delay lets its callback run.
            - delay: 70ms
            - lambda: |-
                const float value = id(pt100_reader).state;
                switch (id(pt100_channel)) {
                  case 0: id(pt100_1).publish_state(value); break;
                  case 1: id(pt100_2).publish_state(value); break;
                  case 2: id(pt100_3).publish_state(value); break;
                  case 3: id(pt100_4).publish_state(value); break;
                }
                id(pt100_channel) = (id(pt100_channel) + 1) % 4;