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add arduino page
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source/components/arduino.markdown
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source/components/arduino.markdown
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---
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layout: page
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title: "Arduino"
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description: "Instructions how to setup an Arduino boards within Home Assistant."
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date: 2015-06-27 10:28
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sidebar: false
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comments: false
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sharing: true
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footer: true
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---
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<img src='/images/supported_brands/arduino.png' class='brand pull-right' />
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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.
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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.
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## Basic Configuration
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The arduino component is designed to let you use a directly attached board to your Home Assistant host over USB.
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To integrate an Arduino boards with Home Assistant, add the following section to your `configuration.yaml` file:
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```yaml
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# Example configuration.yaml entry
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arduino:
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port: /dev/ttyACM0
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```
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The port where is your board connected to your Home Assistant host. If you are using an original Arduino the port will be named `ttyACM*`. The exact
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number can be determined with `ls /dev/ttyACM*`.
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```bash
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ls /dev/ttyACM*
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```
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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*`).
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<p class='note warning'>
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A word of caution: The Arduino boards are not storing states. This means that with every initialization the pins are set to off/low.
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</p>
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## Switch Configuration
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Support for switching pins is limited to high/on and low/off of the digital pins. PWM (pin 3,5,6,9,10, and 11 on a Arduino Uno) is not supported yet.
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To enable the Arduino switch pins with Home Assistant, add the following section to your `configuration.yaml` file:
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```yaml
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# Example configuration.yaml entry
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switch:
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platform: arduino
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pins:
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11:
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name: Fan Office
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type: digital
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12:
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name: Light Desk
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type: digital
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```
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The digital pins are numbered from 0 to 13. The available pins are 2 till 13. For testing purposes you can use pin 13 because with that pin you can control the internal LED.
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The name field of the pins array will be used in the frontend.
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## Sensor Configuration
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The sensor platform allow you to get an numerical values from an analog input pin. Usually between 0 and 1024.
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To enable an Arduino sensor with Home Assistant, add the following section to your `configuration.yaml` file:
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```yaml
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# Example configuration.yaml entry
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sensor:
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platform: arduino
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pins:
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1:
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name: Door switch
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type: analog
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0:
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name: Brightness
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type: analog
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```
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The 6 analog pins are numbered from A0 to A5.
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The name field of the pins array will be used in the frontend.
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