mirror of https://github.com/esphome/esphome.git
109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
#include "sm300d2.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace sm300d2 {
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static const char *const TAG = "sm300d2";
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static const uint8_t SM300D2_RESPONSE_LENGTH = 17;
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void SM300D2Sensor::update() {
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uint8_t response[SM300D2_RESPONSE_LENGTH];
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uint8_t peeked;
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while (this->available() > 0 && this->peek_byte(&peeked) && peeked != 0x3C)
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this->read();
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bool read_success = read_array(response, SM300D2_RESPONSE_LENGTH);
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if (!read_success) {
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ESP_LOGW(TAG, "Reading data from SM300D2 failed!");
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status_set_warning();
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return;
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}
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if (response[0] != 0x3C || response[1] != 0x02) {
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ESP_LOGW(TAG, "Invalid preamble for SM300D2 response!");
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this->status_set_warning();
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return;
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}
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uint16_t calculated_checksum = this->sm300d2_checksum_(response);
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// Occasionally the checksum has a +/- 0x80 offset. Negative temperatures are
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// responsible for some of these. The rest are unknown/undocumented.
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if ((calculated_checksum != response[SM300D2_RESPONSE_LENGTH - 1]) &&
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(calculated_checksum - 0x80 != response[SM300D2_RESPONSE_LENGTH - 1]) &&
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(calculated_checksum + 0x80 != response[SM300D2_RESPONSE_LENGTH - 1])) {
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ESP_LOGW(TAG, "SM300D2 Checksum doesn't match: 0x%02X!=0x%02X", response[SM300D2_RESPONSE_LENGTH - 1],
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calculated_checksum);
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this->status_set_warning();
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return;
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}
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this->status_clear_warning();
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ESP_LOGW(TAG, "Successfully read SM300D2 data");
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const uint16_t co2 = (response[2] * 256) + response[3];
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const uint16_t formaldehyde = (response[4] * 256) + response[5];
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const uint16_t tvoc = (response[6] * 256) + response[7];
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const uint16_t pm_2_5 = (response[8] * 256) + response[9];
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const uint16_t pm_10_0 = (response[10] * 256) + response[11];
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// A negative value is indicated by adding 0x80 (128) to the temperature value
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const float temperature = ((response[12] + (response[13] * 0.1f)) > 128)
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? (((response[12] + (response[13] * 0.1f)) - 128) * -1)
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: response[12] + (response[13] * 0.1f);
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const float humidity = response[14] + (response[15] * 0.1f);
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ESP_LOGD(TAG, "Received CO₂: %u ppm", co2);
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if (this->co2_sensor_ != nullptr)
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this->co2_sensor_->publish_state(co2);
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ESP_LOGD(TAG, "Received Formaldehyde: %u µg/m³", formaldehyde);
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if (this->formaldehyde_sensor_ != nullptr)
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this->formaldehyde_sensor_->publish_state(formaldehyde);
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ESP_LOGD(TAG, "Received TVOC: %u µg/m³", tvoc);
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if (this->tvoc_sensor_ != nullptr)
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this->tvoc_sensor_->publish_state(tvoc);
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ESP_LOGD(TAG, "Received PM2.5: %u µg/m³", pm_2_5);
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if (this->pm_2_5_sensor_ != nullptr)
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this->pm_2_5_sensor_->publish_state(pm_2_5);
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ESP_LOGD(TAG, "Received PM10: %u µg/m³", pm_10_0);
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if (this->pm_10_0_sensor_ != nullptr)
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this->pm_10_0_sensor_->publish_state(pm_10_0);
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ESP_LOGD(TAG, "Received Temperature: %.2f °C", temperature);
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if (this->temperature_sensor_ != nullptr)
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this->temperature_sensor_->publish_state(temperature);
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ESP_LOGD(TAG, "Received Humidity: %.2f percent", humidity);
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if (this->humidity_sensor_ != nullptr)
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this->humidity_sensor_->publish_state(humidity);
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}
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uint16_t SM300D2Sensor::sm300d2_checksum_(uint8_t *ptr) {
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uint8_t sum = 0;
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for (int i = 0; i < (SM300D2_RESPONSE_LENGTH - 1); i++) {
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sum += *ptr++;
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}
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return sum;
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}
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void SM300D2Sensor::dump_config() {
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ESP_LOGCONFIG(TAG, "SM300D2:");
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LOG_SENSOR(" ", "CO2", this->co2_sensor_);
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LOG_SENSOR(" ", "Formaldehyde", this->formaldehyde_sensor_);
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LOG_SENSOR(" ", "TVOC", this->tvoc_sensor_);
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LOG_SENSOR(" ", "PM2.5", this->pm_2_5_sensor_);
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LOG_SENSOR(" ", "PM10", this->pm_10_0_sensor_);
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LOG_SENSOR(" ", "Temperature", this->temperature_sensor_);
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LOG_SENSOR(" ", "Humidity", this->humidity_sensor_);
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this->check_uart_settings(9600);
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}
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} // namespace sm300d2
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} // namespace esphome
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