ESPHome config for Dingtian 4CH Relay (dtwonder DT-R004) + Modbus NPN IO extender module

dingtian-4ch.yaml

esphome:
  name: dingtian-4ch
  friendly_name: Dingtian 4CH
  comment: "ESP32-D0WD v1.0"
  # Change NPN module modbus speed to 19200
  # Baud rate corresponds to the number: 0: 1200  1: 2400  2: 4800  3: 9600  4: 19200
  #on_boot:
  #  ## configure controller settings at setup
  #  ## make sure priority is lower than setup_priority of modbus_controller
  #  priority: -100
  #  then:
  #    - lambda: |-
  #        esphome::modbus_controller::ModbusController *controller = id(npn);
  #        esphome::modbus_controller::ModbusCommandItem cmd = esphome::modbus_controller::ModbusCommandItem::create_write_single_command(
  #          controller, 0x00FF, 0x0004);
  #        delay(200);
  #        controller->queue_command(cmd);
  #        ESP_LOGI("ModbusLambda", "New address set");

esp32:
  board: esp32dev
  framework:
    type: esp-idf

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: !secret encryption_key

ota:
  password: !secret ota_password

#wifi:
#  ssid: !secret wifi_ssid
#  password: !secret wifi_password

ethernet:
  type: JL1101
  mdc_pin: GPIO23
  mdio_pin: GPIO18
  phy_addr: 0
  clk_mode: GPIO17_OUT
  power_pin: GPIO0

uart:
  id: mod_bus
  tx_pin: 1
  rx_pin: 3
  baud_rate: 19200
  stop_bits: 1
  parity: NONE
  data_bits: 8
  debug:
    direction: BOTH

modbus:
  flow_control_pin: 13
  id: modbus1

modbus_controller:
  - id: npn
    address: 0x1
    modbus_id: modbus1
    setup_priority: -10
    update_interval: 500ms

status_led:
  pin:
    number: GPIO15
    inverted: true

sensor:
  - platform: modbus_controller
    modbus_controller_id: npn
    id: io_range_1
    name: "IO Range 1"
    address: 0x00C0
    register_type: holding
    value_type: U_WORD
    internal: true
  - platform: modbus_controller
    modbus_controller_id: npn
    id: io_range_2
    name: "IO Range 2"
    address: 0x00C1
    register_type: holding
    value_type: U_WORD
    internal: true

binary_sensor:
  - platform: gpio
    name: "Factory Button"
    internal: true
    pin:
      number: GPIO34
      inverted: true
    on_press:
      then:
        - switch.toggle: restart_switch

  - name: "Main Input 1"
    id: m_io_1
    platform: gpio
    pin:
      number: GPIO36
      inverted: true
  - name: "Main Input 2"
    id: m_io_2
    platform: gpio
    pin:
      number: GPIO39
      inverted: true
  - name: "Main Input 3"
    id: m_io_3
    platform: gpio
    pin:
      number: GPIO33
      inverted: true
  - name: "Main Input 4"
    id: m_io_4
    platform: gpio
    pin:
      number: GPIO35
      inverted: true

  # Modbus NPN module inputs
  # Range 1
  - platform: template
    id: io_01
    name: "Input 01"
    lambda: |-
      return ((int(id(io_range_1).state) >> 0) & 1);
  - platform: template
    id: io_02
    name: "Input 02"
    lambda: |-
      return ((int(id(io_range_1).state) >> 1) & 1);
  - platform: template
    id: io_03
    name: "Input 03"
    lambda: |-
      return ((int(id(io_range_1).state) >> 2) & 1);
  - platform: template
    id: io_04
    name: "Input 04"
    lambda: |-
      return ((int(id(io_range_1).state) >> 3) & 1);
  - platform: template
    id: io_05
    name: "Input 05"
    lambda: |-
      return ((int(id(io_range_1).state) >> 4) & 1);
  - platform: template
    id: io_06
    name: "Input 06"
    lambda: |-
      return ((int(id(io_range_1).state) >> 5) & 1);
  - platform: template
    id: io_07
    name: "Input 07"
    lambda: |-
      return ((int(id(io_range_1).state) >> 6) & 1);
  - platform: template
    id: io_08
    name: "Input 08"
    lambda: |-
      return ((int(id(io_range_1).state) >> 7) & 1);
  - platform: template
    id: io_09
    name: "Input 09"
    lambda: |-
      return ((int(id(io_range_1).state) >> 8) & 1);
  - platform: template
    id: io_10
    name: "Input 10"
    lambda: |-
      return ((int(id(io_range_1).state) >> 9) & 1);
  - platform: template
    id: io_11
    name: "Input 11"
    lambda: |-
      return ((int(id(io_range_1).state) >> 10) & 1);
  - platform: template
    id: io_12
    name: "Input 12"
    lambda: |-
      return ((int(id(io_range_1).state) >> 11) & 1);
  - platform: template
    id: io_13
    name: "Input 13"
    lambda: |-
      return ((int(id(io_range_1).state) >> 12) & 1);
  - platform: template
    id: io_14
    name: "Input 14"
    lambda: |-
      return ((int(id(io_range_1).state) >> 13) & 1);
  - platform: template
    id: io_15
    name: "Input 15"
    lambda: |-
      return ((int(id(io_range_1).state) >> 14) & 1);
  - platform: template
    id: io_16
    name: "Input 16"
    lambda: |-
      return ((int(id(io_range_1).state) >> 15) & 1);
  # Range 2
  - platform: template
    id: io_17
    name: "Input 17"
    lambda: |-
      return ((int(id(io_range_2).state) >> 0) & 1);
  - platform: template
    id: io_18
    name: "Input 18"
    lambda: |-
      return ((int(id(io_range_2).state) >> 1) & 1);
  - platform: template
    id: io_19
    name: "Input 19"
    lambda: |-
      return ((int(id(io_range_2).state) >> 2) & 1);
  - platform: template
    id: io_20
    name: "Input 20"
    lambda: |-
      return ((int(id(io_range_2).state) >> 3) & 1);
  - platform: template
    id: io_21
    name: "Input 21"
    lambda: |-
      return ((int(id(io_range_2).state) >> 4) & 1);
  - platform: template
    id: io_22
    name: "Input 22"
    lambda: |-
      return ((int(id(io_range_2).state) >> 5) & 1);
  - platform: template
    id: io_23
    name: "Input 23"
    lambda: |-
      return ((int(id(io_range_2).state) >> 6) & 1);
  - platform: template
    id: io_24
    name: "Input 24"
    lambda: |-
      return ((int(id(io_range_2).state) >> 7) & 1);
  - platform: template
    id: io_25
    name: "Input 25"
    lambda: |-
      return ((int(id(io_range_2).state) >> 8) & 1);
  - platform: template
    id: io_26
    name: "Input 26"
    lambda: |-
      return ((int(id(io_range_2).state) >> 9) & 1);
  - platform: template
    id: io_27
    name: "Input 27"
    lambda: |-
      return ((int(id(io_range_2).state) >> 10) & 1);
  - platform: template
    id: io_28
    name: "Input 28"
    lambda: |-
      return ((int(id(io_range_2).state) >> 11) & 1);
  - platform: template
    id: io_29
    name: "Input 29"
    lambda: |-
      return ((int(id(io_range_2).state) >> 12) & 1);
  - platform: template
    id: io_30
    name: "Input 30"
    lambda: |-
      return ((int(id(io_range_2).state) >> 13) & 1);
  - platform: template
    id: io_31
    name: "Input 31"
    lambda: |-
      return ((int(id(io_range_2).state) >> 14) & 1);
  - platform: template
    id: io_32
    name: "Input 32"
    lambda: |-
      return ((int(id(io_range_2).state) >> 15) & 1);

switch:
  - name: "Relay 4"
    platform: gpio
    pin: GPIO12
  - name: "Relay 3"
    platform: gpio
    pin: GPIO32
  - name: "Relay 2"
    platform: gpio
    pin: GPIO2
  - name: "Relay 1"
    platform: gpio
    pin: GPIO16
  
  - platform: restart
    name: "Restart"
    internal: true
    id: restart_switch

ok, found this answer on serveral other locations now. Well I do have some blank ESP32 laying arround. So I need to swap...