ArduinoHA allows to integrate an Arduino/ESP based device with Home Assistant using MQTT. The library is designed to use as little resources (RAM/flash) as possible. Initially it was optimized to work on Arduino Uno with Ethernet Shield, but I successfully use it on ESP8266/ESP8255 boards in my projects.

Features

MQTT discovery (device is added to the Home Assistant panel automatically)
MQTT Last Will and Testament
Auto reconnect with MQTT broker

Examples

Tested boards

Arduino Uno
Arduino Mega
Controllino Maxi (standard/pure/automation/power)
Controllino Mega (standard/pure)
NodeMCU
ESP-01
Generic ESP8266/ESP8255
Arduino Nano 33 IoT (SAMD)

Tested Arduino Shields

Arduino Ethernet Shield (WizNet W5100)

Supported HA types

Binary sensors
Fans
Device triggers
Switches
Sensors
Tag scanner
HVACs (side note: HVACs requires more flash size than other HA types. It's not suitable for Arduino Nano/Uno)

Roadmap

FAQ + Home Assistant setup instructions
Documentation of the library
Unit tests
Reduce flash memory usage
Add support for HA covers
Add support for HA lights

Unsupported features

The library doesn't support all features of the MQTT integration. If you need support for a new feature please open a new issue in the repository.

License

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License v3.0 as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/gpl.html