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67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
#include "gp2y1010au0f.h"
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#include "esphome/core/hal.h"
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#include "esphome/core/log.h"
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#include <cinttypes>
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namespace esphome {
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namespace gp2y1010au0f {
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static const char *const TAG = "gp2y1010au0f";
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static const float MIN_VOLTAGE = 0.0f;
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static const float MAX_VOLTAGE = 4.0f;
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void GP2Y1010AU0FSensor::dump_config() {
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LOG_SENSOR("", "Sharp GP2Y1010AU0F PM2.5 Sensor", this);
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ESP_LOGCONFIG(TAG, " Sampling duration: %" PRId32 " ms", this->sample_duration_);
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ESP_LOGCONFIG(TAG, " ADC voltage multiplier: %.3f", this->voltage_multiplier_);
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LOG_UPDATE_INTERVAL(this);
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}
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void GP2Y1010AU0FSensor::update() {
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is_sampling_ = true;
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this->set_timeout("read", this->sample_duration_, [this]() {
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this->is_sampling_ = false;
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if (this->num_samples_ == 0)
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return;
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float mean = this->sample_sum_ / float(this->num_samples_);
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ESP_LOGD(TAG, "ADC read voltage: %.3f V (mean from %" PRId32 " samples)", mean, this->num_samples_);
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// PM2.5 calculation
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// ref: https://www.howmuchsnow.com/arduino/airquality/
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int16_t pm_2_5_value = 170 * mean;
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this->publish_state(pm_2_5_value);
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});
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// reset readings
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this->num_samples_ = 0;
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this->sample_sum_ = 0.0f;
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}
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void GP2Y1010AU0FSensor::loop() {
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if (!this->is_sampling_)
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return;
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// enable the internal IR LED
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this->led_output_->turn_on();
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// wait for the sensor to stabilize
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delayMicroseconds(this->sample_wait_before_);
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// perform a single sample
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float read_voltage = this->source_->sample();
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// disable the internal IR LED
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this->led_output_->turn_off();
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if (std::isnan(read_voltage))
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return;
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read_voltage = read_voltage * this->voltage_multiplier_ - this->voltage_offset_;
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if (read_voltage < MIN_VOLTAGE || read_voltage > MAX_VOLTAGE)
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return;
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this->num_samples_++;
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this->sample_sum_ += read_voltage;
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}
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} // namespace gp2y1010au0f
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} // namespace esphome
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