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75 lines
2.4 KiB
ReStructuredText
75 lines
2.4 KiB
ReStructuredText
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MCP3008 I/O Expander
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====================
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.. seo::
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:description: Instructions for setting up MCP3008 10 Bit Analog to Digital Converter in ESPHome.
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:image: mcp3008.png
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.. note::
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This page is incomplete and could some work. If you want to contribute, please read the
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:doc:`contributing guide </guides/contributing>`. This page is missing:
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- An image for the front page.
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- Formal documentation of the mcp3008 sensor entry (parent, update_interval, number, etc.)
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- See Dallas sensor for reference model
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The Microchip Technology Inc. MCP3008
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devices are successive approximation 10-bit Analogto-Digital (A/D) converters with on-board sample and
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hold circuitry. Each pin will respond with a 0-1023 result depending on the voltage it is reading
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MCP3008
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-------
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The MCP3008 component allows you to use MCP3008 8-Channel 10-Bit A/D Converter
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(`datasheet <http://ww1.microchip.com/downloads/en/DeviceDoc/21295d.pdf>`__,
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`Adafruit <https://www.adafruit.com/product/856>`__) in ESPHome.
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It uses the :ref:`SPI Bus <spi>` for communication.
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Once configured, you can use any of the 8 pins as
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sensors for your projects.
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.. code-block:: yaml
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# Example configuration entry
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mcp3008:
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cs_pin: D8
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# Example config of sensors.
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# This is a NTCB3950 10K thermocoupler attached to pin 0
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# of the MCP3008 with a 10K resistor as a voltage divider.
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# See `resistance` and `ntc` platorms for other options
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sensor:
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- platform: mcp3008 # Attached to pin 0 of the MCP3008.
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# The result will be a reading from 0-1023
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update_interval: 1s
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id: freezer_temp_source
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number: 0 # pin number
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- platform: resistance
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id: freezer_resistance_sensor
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sensor: freezer_temp_source
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configuration: DOWNSTREAM
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resistor: 10kOhm
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- platform: ntc
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id: freezer_temp
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sensor: freezer_resistance_sensor
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calibration:
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b_constant: 3950
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reference_temperature: 25°C
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reference_resistance: 10kOhm
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name: Freezer Temperature
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Configuration variables:
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~~~~~~~~~~~~~~~~~~~~~~~~
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- **id** (**Required**, :ref:`config-id`): The id to use for this MCP3008 component.
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- **cs_pin** (**Required**, int): The SPI cable select pin to use
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See Also
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--------
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- :ref:`spi`
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- :apiref:`mcp3008/mcp3008.h`
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- :ghedit:`Edit`
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