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Paulus Schoutsen 2015-10-24 21:44:04 -07:00
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---
layout: page
title: "Arduino"
description: "Instructions how to setup an Arduino boards within Home Assistant."
date: 2015-06-27 10:28
sidebar: false
comments: false
sharing: true
footer: true
---
<img src='/images/supported_brands/arduino.png' class='brand pull-right' />
The [Arduino](https://www.arduino.cc/) device family are microcontroller boards that are often based on the ATmega328 chip. They come with digital input/output pins (some can be used as PWM outputs), analog inputs, and a USB connection. The equipment depends on the [type](https://www.arduino.cc/en/Main/Products) of board. The most common ones are the Arduino Uno and the Arduino Leonardo with 14 digital input/output pins and 6 analog input pins.
There are a lot of extensions (so called [shields](https://www.arduino.cc/en/Main/ArduinoShields)) available. Those shields can be plugged-in into the existing connectors and stacked on top of each other. This makes it possible to expand the capabilities of the Arduino boards.
## Basic Configuration
The arduino component is designed to let you use a directly attached board to your Home Assistant host over USB.
You need to have the [Firmata firmware](https://github.com/firmata/) on your board. Please upload the `StandardFirmata` sketch to your board, please refer to the [Arduino documentation](https://www.arduino.cc/en/Main/Howto) for further information.
To integrate an Arduino boards with Home Assistant, add the following section to your `configuration.yaml` file:
```yaml
# Example configuration.yaml entry
arduino:
port: /dev/ttyACM0
```
Configuration variables:
- **port** (*Required*): The port where your board is connected to your Home Assistant host. If you are using an original Arduino the port will be named `ttyACM*`. The exact number can be determined with `ls /dev/ttyACM*`.
```bash
ls /dev/ttyACM*
```
If that is not working, check your `dmesg` or `journalctl -f` output. Keep in mind that Arduino clones are often using a different name for the port (e.g. `/dev/ttyUSB*`).
<p class='note warning'>
A word of caution: The Arduino boards are not storing states. This means that with every initialization the pins are set to off/low.
</p>
## Building on top of the Arduino component
- [Arduino Sensor](/components/sensor.arduino.html)
- [Arduino Switch](/components/switch.arduino.html)