esphome-docs/components/sensor/atm90e32.rst

ATM90E32 Power Sensor
=====================

.. seo::
    :description: Instructions for setting up ATM90E32 energy metering sensors
    :image: atm90e32.png
    :keywords: ATM90E32, CircuitSetup, Split Single Phase Real Time Whole House Energy Meter, Expandable 6 Channel ESP32 Energy Meter Main Board

The ``atm90e32`` sensor platform allows you to use your ATM90E32 voltage/current and power sensors
(`datasheet <http://ww1.microchip.com/downloads/en/devicedoc/Atmel-46003-SE-M90E32AS-Datasheet.pdf>`__) sensors with
ESPHome. This sensor is commonly found in CircuitSetup 2 and 6 channel energy meters.

Communication with the device is done via an :ref:`SPI bus <spi>`, so you need to have an ``spi:`` entry in your configuration
with both ``mosi_pin`` and ``miso_pin`` set.

The atm90e32 IC can measure up to three AC voltages although typically only one
voltage measurement would be used for the mains electricity phase of a
household. Three current measurements are read via CT clamps.

The `CircuitSetup 2-Channel Energy Monitor <https://circuitsetup.us/index.php/product/split-single-phase-real-time-whole-house-energy-meter-v1-2/>`__ can read 2 current channels and one voltage channel.

.. figure:: images/atm90e32-cs-2chan-full.jpg
    :align: center
    :width: 50.0%

    CircuitSetup Split Single Phase Real Time Whole House Energy Meter.

The `CircuitSetup 6-Channel Energy Monitor <https://circuitsetup.us/index.php/product/expandable-6-channel-esp32-energy-meter/>`__ can read 6 current channels and 2 voltage channels at a time, this board has two atm90e32 ICs and requires two sensors to be configured in ESPHome.

.. figure:: images/atm90e32-cs-6chan-full.jpg
    :align: center
    :width: 50.0%

    CircuitSetup Expandable 6 Channel ESP32 Energy Meter Main Board.

.. code-block:: yaml

    # Example configuration entry
    spi:
      clk_pin: 18
      miso_pin: 19
      mosi_pin: 23

    sensor:
      - platform: atm90e32
        cs_pin: 5
        phase_a:
          voltage:
            name: "EMON Line Voltage A"
          current:
            name: "EMON CT1 Current"
          power:
            name: "EMON Active Power CT1"
          gain_voltage: 41820
          gain_ct: 25498
        phase_b:
          current:
            name: "EMON CT2 Current"
          power:
            name: "EMON Active Power CT2"
          gain_voltage: 41820
          gain_ct: 25498
        frequency:
          name: "EMON Line Frequency"
        line_frequency: 50Hz
        gain_pga: 2X
        update_interval: 60s

Configuration variables:
------------------------

- **cs_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The pin CS is connected to.
- **line_frequency** (**Required**, string): The AC line frequency of the supply voltage. One of ``50Hz``, ``60Hz``.
- **phase_a** (*Optional*): The configuration options for the 1st phase.

  - **voltage** (*Optional*): Use the voltage value of this phase in V (RMS).
    All options from :ref:`Sensor <config-sensor>`.
  - **current** (*Optional*): Use the current value of this phase in amperes. All options from
    :ref:`Sensor <config-sensor>`.
  - **power** (*Optional*): Use the power value on this phase in watts. All options from
    :ref:`Sensor <config-sensor>`.
  - **gain_voltage** (*Optional*, int): Voltage gain to scale the low voltage AC power pack to household mains feed.
    Defaults to ``41820``.
  - **gain_ct** (*Optional*, int): CT clamp calibration for this phase.
    Defaults to ``25498``.

- **phase_b** (*Optional*): The configuration options for the 2nd phase. Same options as 1st phase.
- **phase_c** (*Optional*): The configuration options for the 3rd phase. Same options as 1st phase.
- **gain_pga** (*Optional*, string): The gain for the CT clamp, ``2X`` for 100A, ``4X`` for 100A - 200A. One of ``1X``, ``2X``, ``4X``.
  Defaults to ``2X`` which is suitable for the popular SCT-013-000 clamp.
- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the sensor. Defaults to ``60s``.
- **spi_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`SPI Component <spi>` if you want
  to use multiple SPI buses.

Calibration
-----------

This sensor needs calibration to show correct values. The default gain configuration is set to use the `SCT-013-000 <https://amzn.to/2E0KVvo>`__
current transformers, and the `Jameco Reliapro 9v AC transformer <https://amzn.to/2XcWJjI>`__. 
A load which uses a known amount of current can be used to calibrate. For for a more accurate calibration use a
`Kill-A-Watt <https://amzn.to/2TXT7jx>`__ meter or similar, mains voltages can fluctuate depending on grid load.

Voltage
^^^^^^^

Use the expected mains voltage for your region 110V/230V or plug in the Kill-A-Watt and select voltage. See what 
value the ATM90E32 sensor reports for voltage. To adjust the sensor use the calculation:

``New gain_voltage = (your voltage reading / ESPHome voltage reading) * existing gain_voltage value``

Update **gain_voltage** for all phases in your ESPHome yaml, recompile and upload. Repeat as necessary.

Current
^^^^^^^

Switch on the current load and see what value the ATM90E32 sensor reports for
current on the selected phase. Using the known or measured current adjust the
sensor using calculation:

``New gain_ct = (your current reading / ESPHome current reading) * existing gain_ct value``

Update **gain_ct** for the phase in your ESPHome yaml, recompile and upload. Repeat as necessary.

It is possible that the two identical CT current sensors will have different
**gain_ct** numbers due to variances in manufacturing although it will be
small. The current calibration can be done once and used on all sensors or
repeated for each one.

Additional Examples
-------------------

.. code-block:: yaml

    # Example CircuitSetup 6-channel entry
    spi:
      clk_pin: 18
      miso_pin: 19
      mosi_pin: 23
    sensor:
      - platform: atm90e32
        cs_pin: 5
        phase_a:
          voltage:
            name: "EMON Line Voltage A"
          current:
            name: "EMON CT1 Current"
          power:
            name: "EMON Active Power CT1"
          gain_voltage: 47660
          gain_ct: 12577
        phase_b:
          current:
            name: "EMON CT2 Current"
          power:
            name: "EMON Active Power CT2"
          gain_voltage: 47660
          gain_ct: 12577
        phase_c:
          current:
            name: "EMON CT3 Current"
          power:
            name: "EMON Active Power CT3"
          gain_voltage: 47660
          gain_ct: 12577
        frequency:
          name: "EMON Line Frequency"
        line_frequency: 50Hz
        gain_pga: 2X
        update_interval: 60s
      - platform: atm90e32
        cs_pin: 4
        phase_a:
          current:
            name: "EMON CT4 Current"
          power:
            name: "EMON Active Power CT4"
          gain_voltage: 47660
          gain_ct: 12577
        phase_b:
          current:
            name: "EMON CT5 Current"
          power:
            name: "EMON Active Power CT5"
          gain_voltage: 47660
          gain_ct: 12577
        phase_c:
          current:
            name: "EMON CT6 Current"
          power:
            name: "EMON Active Power CT6"
          gain_voltage: 47660
          gain_ct: 12577
        line_frequency: 50Hz
        gain_pga: 2X
        update_interval: 60s


See Also
--------

- :ref:`sensor-filters`
- :apiref:`atm90e32/atm90e32.h`
- :ghedit:`Edit`