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58 lines
2.0 KiB
ReStructuredText
58 lines
2.0 KiB
ReStructuredText
Analog To Digital Sensor
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========================
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The Analog To Digital (``adc``) Sensor allows you to use the built-in
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ADC in your device to measure a voltage on certain pins. On the ESP8266
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only pin A0 (GPIO17) supports this. On the ESP32 pins GPIO32 through
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GPIO39 can be used.
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|image0|
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.. code:: yaml
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# Example configuration entry
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sensor:
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- platform: adc
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pin: A0
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name: "Living Room Brightness"
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update_interval: 15s
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Configuration variables:
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~~~~~~~~~~~~~~~~~~~~~~~~
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- **pin** (**Required**,
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`pin </esphomeyaml/configuration-types.html#pin>`__): The pin to
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measure the voltage on.
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- **name** (**Required**, string): The name of the voltage sensor.
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- **attenuation** (*Optional*): Only on ESP32. Specify the `ADC
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attenuation <http://esp-idf.readthedocs.io/en/latest/api-reference/peripherals/adc.html#_CPPv225adc1_config_channel_atten14adc1_channel_t11adc_atten_t>`__
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to use. One of ``0db``, ``2.5db``, ``6db``, ``11db``. Defaults to
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``0db``.
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- **update_interval** (*Optional*,
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`time </esphomeyaml/configuration-types.html#time>`__): The interval
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to check the sensor. Defaults to ``15s``.
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- **id** (*Optional*,
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`id </esphomeyaml/configuration-types.html#id>`__): Manually specify
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the ID used for code generation.
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- All other options from
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`Sensor </esphomeyaml/components/sensor/index.html#base-sensor-configuration>`__
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and `MQTT
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Component </esphomeyaml/components/mqtt.html#mqtt-component-base-configuration>`__.
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.. |image0| image:: /esphomeyaml/components/sensor/adc.png
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:class: align-center
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:width: 80.0%
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ESP32 Attenuation
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~~~~~~~~~~~~~~~~~
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On the ESP32, the voltage measured with the ADC caps out at 1.1V by default as the sensing range
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or the attenuation of the ADC is set to ``0db`` by default.
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To measure voltages higher than 1.1V, set ``attenuation`` to one of the following values:
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- ``0db`` for a full-scale voltage of 1.1V (default)
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- ``2.5db`` for a full-scale voltage of 1.5V
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- ``6db`` for a full-scale voltage of 2.2V
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- ``11db`` for a full-scale voltage of 3.9V
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