mirror of https://github.com/esphome/esphome.git
54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
#pragma once
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#include "esphome/core/component.h"
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#include "esphome/core/hal.h"
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#include "esphome/components/sensor/sensor.h"
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#include "esphome/components/voltage_sampler/voltage_sampler.h"
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namespace esphome {
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namespace ct_clamp {
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class CTClampSensor : public sensor::Sensor, public PollingComponent {
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public:
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void update() override;
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void loop() override;
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void dump_config() override;
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float get_setup_priority() const override {
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// After the base sensor has been initialized
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return setup_priority::DATA - 1.0f;
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}
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void set_sample_duration(uint32_t sample_duration) { sample_duration_ = sample_duration; }
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void set_source(voltage_sampler::VoltageSampler *source) { source_ = source; }
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protected:
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/// High Frequency loop() requester used during sampling phase.
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HighFrequencyLoopRequester high_freq_;
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/// Duration in ms of the sampling phase.
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uint32_t sample_duration_;
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/// The sampling source to read values from.
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voltage_sampler::VoltageSampler *source_;
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/** The DC offset of the circuit.
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*
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* Diagram: https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/interface-with-arduino
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*
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* The current clamp only measures AC, so any DC component is an unwanted artifact from the
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* sampling circuit. The AC component is essentially the same as the calculating the Standard-Deviation,
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* which can be done by cumulating 3 values per sample:
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* 1) Number of samples
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* 2) Sum of samples
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* 3) Sum of sample squared
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* https://en.wikipedia.org/wiki/Root_mean_square
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*/
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float sample_sum_ = 0.0f;
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float sample_squared_sum_ = 0.0f;
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uint32_t num_samples_ = 0;
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bool is_sampling_ = false;
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};
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} // namespace ct_clamp
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} // namespace esphome
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