From 961bf338613424b3619b916b23b210d2c301abe5 Mon Sep 17 00:00:00 2001 From: Jesse Hills <3060199+jesserockz@users.noreply.github.com> Date: Wed, 29 May 2019 21:15:12 +1200 Subject: [PATCH] Add docs for CT Clamp (#256) * Add docs for CT Clamp * Fix title bar * Fix reference * 2 many changes * Update docs for new configuration * Compress index image * Update for config changes - Also remove 3.3V message, because if the user needs to calibrate anyway, then the 3.3V is also part of the calibration process. - Use calibrate_linear instead of multiply, more user-friendly - Update SEO image - Co-authored-by: Otto Winter <otto@otto-winter.com> --- components/sensor/ct_clamp.rst | 82 +++++++++++++++++++++++ components/sensor/images/ct_clamp-ui.png | Bin 0 -> 15051 bytes images/ct_clamp.jpg | Bin 0 -> 9009 bytes index.rst | 1 + 4 files changed, 83 insertions(+) create mode 100644 components/sensor/ct_clamp.rst create mode 100644 components/sensor/images/ct_clamp-ui.png create mode 100644 images/ct_clamp.jpg diff --git a/components/sensor/ct_clamp.rst b/components/sensor/ct_clamp.rst new file mode 100644 index 000000000..7ab9837d7 --- /dev/null +++ b/components/sensor/ct_clamp.rst @@ -0,0 +1,82 @@ +CT Clamp Current Sensor +======================= + +.. seo:: + :description: Instructions for setting up ct clamp sensors. + :image: ct_clamp.jpg + +The Current Transformer Clamp (``ct_clamp``) sensor allows you to hook up a CT Clamp to an analog +voltage sensor (like the :doc:`ADC sensor <adc>`) and convert the readings to measured single phase AC current. + +First, you need to set up a voltage sensor source (:doc:`ADC sensor <adc>`, but for example also +:doc:`ADS1115 <ads1115>`) and pass it to the CT clamp sensor with the ``sensor`` option. + +Please also see `this guide <https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/introduction>`__ +as an introduction to the working principle of CT clamp sensors and how to hook them up to your device. + +.. figure:: images/ct_clamp-ui.png + :align: center + :width: 80.0% + +.. code-block:: yaml + + # Example configuration entry + sensor: + - platform: ct_clamp + sensor: adc_sensor + name: "Measured Current" + update_interval: 60s + + # Example source sensor + - platform: adc + pin: A0 + id: adc_sensor + +Configuration variables: +------------------------ + +- **name** (**Required**, string): The name of the sensor. +- **sensor** (**Required**, :ref:`config-id`): The source sensor to measure voltage values from. +- **sample_duration** (*Optional*, :ref:`config-time`): The time duration to sample the current clamp + with. Higher values can increase accuracy. Defaults to ``200ms`` which would be 10 whole cycles on a 50Hz system. +- **update_interval** (*Optional*, :ref:`config-time`): The interval + to check the sensor. Defaults to ``60s``. +- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation. +- All other options from :ref:`Sensor <config-sensor>`. + +Calibration +----------- + +This sensor needs calibration to show correct values, for this you can use the +:ref:`calibrate_linear <sensor-filter-calibrate_linear>` sensor filter. First, hook up a known +current load like a lamp that uses a known amount of current. + +Then switch it on and see what value the CT clamp sensor reports. For example in the configuration below +a 4.0 A device is showing a value of 0.1333 in the logs. Now go into your configuration file + +.. code-block:: yaml + + # Example configuration entry + sensor: + - platform: ct_clamp + sensor: adc_sensor + name: "Measured Current" + update_interval: 60s + filters: + # Measured value of 0 maps to 0A + - 0 -> 0 + # Known load: 4.0A + # Value shown in logs: 0.1333A + - 0.1333 -> 4.0 + +Recompile and upload, now your CT clamp sensor is calibrated! + +See Also +-------- + +- `EMonLib <https://github.com/openenergymonitor/EmonLib>`__ +- `CT Clamp Guide <https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/introduction>`__ +- :doc:`adc` +- :doc:`ads1115` +- :apiref:`sensor/ct_clamp.h` +- :ghedit:`Edit` diff --git a/components/sensor/images/ct_clamp-ui.png b/components/sensor/images/ct_clamp-ui.png new file mode 100644 index 0000000000000000000000000000000000000000..92ff60eafc9c1934114e7212e356d28612ab62cd GIT binary patch literal 15051 zcmeIYg;yNS);>Bo!4oVvL4q?l!AWp}yK8WF*C4@3aDux-aCdhZ+}$l$@L%(u^ZU;G 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components/sensor/dallas, dallas.jpg DHT, components/sensor/dht, dht.jpg DHT12, components/sensor/dht12, dht12.jpg