ESPHome CANopen external component

This project provides ESPHome external_component named canopen for easy conversion of ESPHome entities into CANopen nodes. It allows to map selected entities to CANopen object dictionary. It also allows to define TPDOs for sending entity state on change. Currently following entity types are supported: sensor, number, binary_sensor, switch, cover, light and alarm_control_panel. Entity metadata are also published in Object Dictionary enabling autodiscovery.

The can2mqtt project provides can2mqtt bridge exposing ESPHome CANopen entities onto MQTT topics. It follows MQTT Discovery protocol, so entities appear automatically in HomeAssistant.

How to start

Hardware requirements

• any ESP8266/ESP32 board with CAN controller. ESP32 boards are preferred, as they have integrated can controller (but still cheap external CAN transceiver is needed). For ESP8266 external MCP2515 CAN controller can be used.

Software requirements

• ESPHome installed

Configure ESPHome with canopen external_component

Example configuration for esp32dev board:

esphome:
  name: can-node-1

external_components:
  - source: github://mrk-its/esphome-canopen

# Enable logging
logger:

# Enable Home Assistant API
api:
  password: ""
  reboot_timeout: 0s

ota:
  password: ""

esp32:
  board: esp32dev
  framework:
    type: arduino

wifi:
  <<: !include {file: wifi.yaml}

canbus:
  - platform: esp32_can
    id: can_bus
    rx_pin: GPIO22
    tx_pin: GPIO23
    can_id: 0
    bit_rate: 125kbps

canopen:
  id: can_gate
  canbus_id: can_bus
  node_id: 1
  entities:
    - id: boot
      index: 1
      tpdo: 0
    - id: blue_led
      index: 2
      tpdo: 0
    - id: uptime_sensor
      index: 3
      tpdo: 0
    - id: cover1
      index: 4
      tpdo: 1
    - id: cover2
      index: 5
      tpdo: 1

sensor:
  - platform: uptime
    id: uptime_sensor
    name: "Uptime 1"
    update_interval: 5sec
    internal: true

binary_sensor:
  - platform: gpio
    name: "Boot 1"
    id: boot
    internal: true
    pin:
      number: 0
      inverted: true

switch:
  - platform: gpio
    name: "Led 1"
    id: blue_led
    internal: true
    pin: 2

cover:
  - platform: time_based
    name: "Cover 1"
    id: cover1
    internal: true
    device_class: shutter
    has_built_in_endstop: true
    open_action:
      - logger.log: open_action
    open_duration: 10s
    close_action:
      - logger.log: close_action
    close_duration: 10s
    stop_action:
      - logger.log: stop_action

Support

Community

• Discord Server