esphome/esphome/components/pmsx003/pmsx003.cpp

#include "pmsx003.h"
#include "esphome/core/log.h"

namespace esphome {
namespace pmsx003 {

static const char *TAG = "pmsx003";

void PMSX003Component::set_pm_1_0_sensor(sensor::Sensor *pm_1_0_sensor) { pm_1_0_sensor_ = pm_1_0_sensor; }
void PMSX003Component::set_pm_2_5_sensor(sensor::Sensor *pm_2_5_sensor) { pm_2_5_sensor_ = pm_2_5_sensor; }
void PMSX003Component::set_pm_10_0_sensor(sensor::Sensor *pm_10_0_sensor) { pm_10_0_sensor_ = pm_10_0_sensor; }
void PMSX003Component::set_temperature_sensor(sensor::Sensor *temperature_sensor) {
  temperature_sensor_ = temperature_sensor;
}
void PMSX003Component::set_humidity_sensor(sensor::Sensor *humidity_sensor) { humidity_sensor_ = humidity_sensor; }
void PMSX003Component::set_formaldehyde_sensor(sensor::Sensor *formaldehyde_sensor) {
  formaldehyde_sensor_ = formaldehyde_sensor;
}

void PMSX003Component::loop() {
  const uint32_t now = millis();
  if (now - this->last_transmission_ >= 500) {
    // last transmission too long ago. Reset RX index.
    this->data_index_ = 0;
  }

  if (this->available() == 0)
    return;

  this->last_transmission_ = now;
  while (this->available() != 0) {
    this->read_byte(&this->data_[this->data_index_]);
    auto check = this->check_byte_();
    if (!check.has_value()) {
      // finished
      this->parse_data_();
      this->data_index_ = 0;
    } else if (!*check) {
      // wrong data
      this->data_index_ = 0;
    } else {
      // next byte
      this->data_index_++;
    }
  }
}
float PMSX003Component::get_setup_priority() const { return setup_priority::DATA; }
optional<bool> PMSX003Component::check_byte_() {
  uint8_t index = this->data_index_;
  uint8_t byte = this->data_[index];

  if (index == 0)
    return byte == 0x42;

  if (index == 1)
    return byte == 0x4D;

  if (index == 2)
    return true;

  uint16_t payload_length = this->get_16_bit_uint_(2);
  if (index == 3) {
    bool length_matches = false;
    switch (this->type_) {
      case PMSX003_TYPE_X003:
        length_matches = payload_length == 28 || payload_length == 20;
        break;
      case PMSX003_TYPE_5003T:
        length_matches = payload_length == 28;
        break;
      case PMSX003_TYPE_5003ST:
        length_matches = payload_length == 36;
        break;
    }

    if (!length_matches) {
      ESP_LOGW(TAG, "PMSX003 length %u doesn't match. Are you using the correct PMSX003 type?", payload_length);
      return false;
    }
    return true;
  }

  // start (16bit) + length (16bit) + DATA (payload_length-2 bytes) + checksum (16bit)
  uint8_t total_size = 4 + payload_length;

  if (index < total_size - 1)
    return true;

  // checksum is without checksum bytes
  uint16_t checksum = 0;
  for (uint8_t i = 0; i < total_size - 2; i++)
    checksum += this->data_[i];

  uint16_t check = this->get_16_bit_uint_(total_size - 2);
  if (checksum != check) {
    ESP_LOGW(TAG, "PMSX003 checksum mismatch! 0x%02X!=0x%02X", checksum, check);
    return false;
  }

  return {};
}

void PMSX003Component::parse_data_() {
  switch (this->type_) {
    case PMSX003_TYPE_X003: {
      uint16_t pm_1_0_concentration = this->get_16_bit_uint_(10);
      uint16_t pm_2_5_concentration = this->get_16_bit_uint_(12);
      uint16_t pm_10_0_concentration = this->get_16_bit_uint_(14);
      ESP_LOGD(TAG,
               "Got PM1.0 Concentration: %u µg/m^3, PM2.5 Concentration %u µg/m^3, PM10.0 Concentration: %u µg/m^3",
               pm_1_0_concentration, pm_2_5_concentration, pm_10_0_concentration);
      if (this->pm_1_0_sensor_ != nullptr)
        this->pm_1_0_sensor_->publish_state(pm_1_0_concentration);
      if (this->pm_2_5_sensor_ != nullptr)
        this->pm_2_5_sensor_->publish_state(pm_2_5_concentration);
      if (this->pm_10_0_sensor_ != nullptr)
        this->pm_10_0_sensor_->publish_state(pm_10_0_concentration);
      break;
    }
    case PMSX003_TYPE_5003T: {
      uint16_t pm_2_5_concentration = this->get_16_bit_uint_(12);
      float temperature = this->get_16_bit_uint_(24) / 10.0f;
      float humidity = this->get_16_bit_uint_(26) / 10.0f;
      ESP_LOGD(TAG, "Got PM2.5 Concentration: %u µg/m^3, Temperature: %.1f°C, Humidity: %.1f%%", pm_2_5_concentration,
               temperature, humidity);
      if (this->pm_2_5_sensor_ != nullptr)
        this->pm_2_5_sensor_->publish_state(pm_2_5_concentration);
      if (this->temperature_sensor_ != nullptr)
        this->temperature_sensor_->publish_state(temperature);
      if (this->humidity_sensor_ != nullptr)
        this->humidity_sensor_->publish_state(humidity);
      break;
    }
    case PMSX003_TYPE_5003ST: {
      uint16_t pm_1_0_concentration = this->get_16_bit_uint_(10);
      uint16_t pm_2_5_concentration = this->get_16_bit_uint_(12);
      uint16_t pm_10_0_concentration = this->get_16_bit_uint_(14);
      uint16_t formaldehyde = this->get_16_bit_uint_(28);
      float temperature = this->get_16_bit_uint_(30) / 10.0f;
      float humidity = this->get_16_bit_uint_(32) / 10.0f;
      ESP_LOGD(TAG, "Got PM2.5 Concentration: %u µg/m^3, Temperature: %.1f°C, Humidity: %.1f%% Formaldehyde: %u µg/m^3",
               pm_2_5_concentration, temperature, humidity, formaldehyde);
      if (this->pm_1_0_sensor_ != nullptr)
        this->pm_1_0_sensor_->publish_state(pm_1_0_concentration);
      if (this->pm_2_5_sensor_ != nullptr)
        this->pm_2_5_sensor_->publish_state(pm_2_5_concentration);
      if (this->pm_10_0_sensor_ != nullptr)
        this->pm_10_0_sensor_->publish_state(pm_10_0_concentration);
      if (this->temperature_sensor_ != nullptr)
        this->temperature_sensor_->publish_state(temperature);
      if (this->humidity_sensor_ != nullptr)
        this->humidity_sensor_->publish_state(humidity);
      if (this->formaldehyde_sensor_ != nullptr)
        this->formaldehyde_sensor_->publish_state(formaldehyde);
      break;
    }
  }

  this->status_clear_warning();
}
uint16_t PMSX003Component::get_16_bit_uint_(uint8_t start_index) {
  return (uint16_t(this->data_[start_index]) << 8) | uint16_t(this->data_[start_index + 1]);
}
void PMSX003Component::dump_config() {
  ESP_LOGCONFIG(TAG, "PMSX003:");
  LOG_SENSOR("  ", "PM1.0", this->pm_1_0_sensor_);
  LOG_SENSOR("  ", "PM2.5", this->pm_2_5_sensor_);
  LOG_SENSOR("  ", "PM10.0", this->pm_10_0_sensor_);
  LOG_SENSOR("  ", "Temperature", this->temperature_sensor_);
  LOG_SENSOR("  ", "Humidity", this->humidity_sensor_);
  LOG_SENSOR("  ", "Formaldehyde", this->formaldehyde_sensor_);
}

}  // namespace pmsx003
}  // namespace esphome