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Provide link to How to enable i2c on HassOS instructions. (#11425)

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* Provide link to How to enable i2c on HassOS instructions.

* ✏️ Tweak


Co-authored-by: Franck Nijhof <frenck@frenck.nl>
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Jardi Martinez 2019-12-10 23:56:41 -08:00 committed by Franck Nijhof
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source/_integrations/mcp23017.markdown
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@ -14,6 +14,8 @@ The `mcp23017` integration is the base for all related mcp23017 platforms in Hom
For more details about the MCP23017 I2C I/O port expander you can find its datasheet here: [MCP23017](https://www.microchip.com/wwwproducts/en/MCP23017).
If you are using Hass.io on HassOS you can’t use existing methods to enable the I2C bus on a Raspberry Pi, you will have to [enable the I2C interface in the Hass.io configuration](https://github.com/home-assistant/hassos/blob/dev/Documentation/boards/raspberrypi.md#i2c) using a USB stick. To accomplish that, follow this step by step instructions: [Enable HassOS i2c](https://www.home-assistant.io/hassio/enable_i2c).
## Binary Sensor
The `mcp23017` binary sensor platform allows you to read sensor values from the I/O pins of your [MCP23017 I2C I/O expander](https://www.adafruit.com/product/732).