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75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
#include "ct_clamp_sensor.h"
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#include "esphome/core/log.h"
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#include <cinttypes>
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#include <cmath>
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namespace esphome {
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namespace ct_clamp {
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static const char *const TAG = "ct_clamp";
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void CTClampSensor::dump_config() {
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LOG_SENSOR("", "CT Clamp Sensor", this);
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ESP_LOGCONFIG(TAG, " Sample Duration: %.2fs", this->sample_duration_ / 1e3f);
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LOG_UPDATE_INTERVAL(this);
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}
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void CTClampSensor::update() {
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// Update only starts the sampling phase, in loop() the actual sampling is happening.
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// Request a high loop() execution interval during sampling phase.
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this->high_freq_.start();
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// Set timeout for ending sampling phase
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this->set_timeout("read", this->sample_duration_, [this]() {
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this->is_sampling_ = false;
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this->high_freq_.stop();
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if (this->num_samples_ == 0) {
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// Shouldn't happen, but let's not crash if it does.
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this->publish_state(NAN);
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return;
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}
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const float rms_ac_dc_squared = this->sample_squared_sum_ / this->num_samples_;
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const float rms_dc = this->sample_sum_ / this->num_samples_;
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const float rms_ac_squared = rms_ac_dc_squared - rms_dc * rms_dc;
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float rms_ac = 0;
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if (rms_ac_squared > 0)
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rms_ac = std::sqrt(rms_ac_squared);
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ESP_LOGD(TAG, "'%s' - Raw AC Value: %.3fA after %" PRIu32 " different samples (%" PRIu32 " SPS)",
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this->name_.c_str(), rms_ac, this->num_samples_, 1000 * this->num_samples_ / this->sample_duration_);
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this->publish_state(rms_ac);
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});
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// Set sampling values
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this->last_value_ = 0.0;
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this->num_samples_ = 0;
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this->sample_sum_ = 0.0f;
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this->sample_squared_sum_ = 0.0f;
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this->is_sampling_ = true;
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}
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void CTClampSensor::loop() {
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if (!this->is_sampling_)
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return;
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// Perform a single sample
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float value = this->source_->sample();
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if (std::isnan(value))
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return;
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// Assuming a sine wave, avoid requesting values faster than the ADC can provide them
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if (this->last_value_ == value)
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return;
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this->last_value_ = value;
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this->num_samples_++;
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this->sample_sum_ += value;
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this->sample_squared_sum_ += value * value;
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}
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} // namespace ct_clamp
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} // namespace esphome
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