122 lines
3.9 KiB
ReStructuredText
122 lines
3.9 KiB
ReStructuredText
cd74hc4067 Analog Multiplexer
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=============================
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.. seo::
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:description: Instructions for setting up cd74hc4067 Analog Multiplexer and sensors.
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:image: cd74hc4067.jpg
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The ``cd74hc4067`` Analog Multiplexer component allows you to attach up to 16 analog input sensors to a single ADC pin.
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The component is used to activate the right multiplexer pin for each of the defined cd74hc4067 sensors.
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For further information about the cd74hc4067 chip see the `spec sheet <https://www.ti.com/lit/ds/symlink/cd74hc4067.pdf>`__
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and there are also some guides around like the one from `Adam Meyer <http://adam-meyer.com/arduino/CD74HC4067>`__.
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Actually, the chip is bidirectional and could also be used as output, but this is not supported by the component yet.
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First, you need to configure the component with the digital pins that control the multiplexer.
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Then you need to set up a voltage sensor source (e.g. :doc:`ADC sensor <adc>`) and pass it to the cd74hc4067 sensors with the ``sensor`` option.
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Each cd74hc4067 sensor is configured for one of the 16 input pins of the multiplexer.
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.. code-block:: yaml
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# Example configuration entry
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cd74hc4067:
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- id: cd74hc4067_1
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pin_s0: D0
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pin_s1: D1
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pin_s2: D2
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pin_s3: D3
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sensor:
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- platform: adc
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id: adc_sensor
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pin: A0
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- platform: cd74hc4067
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id: adc_0
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number: 0
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sensor: adc_sensor
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- platform: cd74hc4067
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id: adc_1
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number: 1
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sensor: adc_sensor
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Component/Hub
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-------------
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Configuration Variables:
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************************
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- **pin_s0** to **pin_s3** (**Required**, :ref:`config-pin`): The I/O pins connected to the S0 to S3 channel selection pins
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- **delay** (*Optional*, :ref:`config-time`): A small delay duration needed for the chip to switch inputs, defaults to 2ms.
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Sensor
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------
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Configuration Variables:
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************************
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- **sensor** (**Required**, :ref:`config-id`): The source sensor to measure voltage values from, e.g. :doc:`ADC sensor <adc>`.
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- **cd74hc4067_id** (**Required**, :ref:`config-id`): The id of the cd74hc4067 component to use for this sensor.
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- **number** (*Required*, int): The number of the cd74hc4067 input pin (0-15)
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- All other options from :ref:`Sensor <config-sensor>`.
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Application Example
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-------------------
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In this example, the component is used to measure the AC power output of two solar inverters to integrate them
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as energy sources in `Home Assistant <https://www.home-assistant.io/docs/energy/solar-panels/>`__.
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For this purpose, :doc:`CT clamp sensors <ct_clamp>` are attached on each of the sensors.
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Filters are needed to calibrate the output and cut off the noise of near-zero values.
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The ``adc`` and ``cd74hc4067`` sensors updates are triggered by the ``ct_clamp`` sensors and have a very high internal update frequency.
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.. code-block:: yaml
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cd74hc4067:
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- id: cd74hc4067_1
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pin_s0: D0
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pin_s1: D1
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pin_s2: D2
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pin_s3: D3
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sensor:
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- platform: adc
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id: adc_sensor
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pin: A0
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update_interval: 3600s
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- platform: cd74hc4067
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id: solar_1_raw
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number: 0
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sensor: adc_sensor
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update_interval: 3600s
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- platform: cd74hc4067
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id: solar_2_raw
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number: 1
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sensor: adc_sensor
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update_interval: 3600s
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- platform: ct_clamp
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name: "SolarPower1"
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sensor: solar_1_raw
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update_interval: 5s
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unit_of_measurement: "W"
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device_class: "power"
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filters:
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- lambda: "return x > 0.001 ? x * 56221 : 0;"
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- platform: ct_clamp
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name: "SolarPower2"
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sensor: solar_2_raw
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update_interval: 5s
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unit_of_measurement: "W"
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device_class: "power"
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filters:
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- lambda: "return x > 0.001 ? x * 57519 : 0;"
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See Also
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--------
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- :doc:`adc`
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- :doc:`ads1115`
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- :doc:`ct_clamp`
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- :ghedit:`Edit`
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