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173 lines
4.8 KiB
173 lines
4.8 KiB
// -----------------------------------------------------------------------------
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// SmartMeasure SM300D2-VO2
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// https://es.aliexpress.com/item/32984571140.html
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// Copyright (C) 2021 by Xose Pérez <xose dot perez at gmail dot com>
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// -----------------------------------------------------------------------------
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#if SENSOR_SUPPORT && SM300D2_SUPPORT
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#pragma once
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#include "BaseSensor.h"
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class SM300D2Sensor : public BaseSensor {
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public:
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void setPort(Stream* port) {
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_serial = port;
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_dirty = true;
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}
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// ---------------------------------------------------------------------
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// Sensor API
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// ---------------------------------------------------------------------
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unsigned char id() const override {
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return SENSOR_SM300D2_ID;
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}
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unsigned char count() const override {
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return 7;
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}
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// Initialization method, must be idempotent
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void begin() override {
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if (!_dirty) return;
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_ready = true;
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_dirty = false;
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}
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// Descriptive name of the sensor
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String description() const override {
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return F("SM300D2");
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}
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// Address of the sensor (it could be the GPIO or I2C address)
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String address(unsigned char index) const override {
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return String(SM300D2_PORT, 10);
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}
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// Type for slot # index
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unsigned char type(unsigned char index) const override {
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if (index == 0) return MAGNITUDE_CO2;
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if (index == 1) return MAGNITUDE_CH2O;
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if (index == 2) return MAGNITUDE_TVOC;
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if (index == 3) return MAGNITUDE_PM2DOT5;
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if (index == 4) return MAGNITUDE_PM10;
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if (index == 5) return MAGNITUDE_TEMPERATURE;
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if (index == 6) return MAGNITUDE_HUMIDITY;
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return MAGNITUDE_NONE;
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}
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// Current value for slot # index
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double value(unsigned char index) override {
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if (index == 0) return _co2;
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if (index == 1) return _ch2o;
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if (index == 2) return _tvoc;
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if (index == 3) return _pm25;
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if (index == 4) return _pm100;
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if (index == 5) return _temperature;
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if (index == 6) return _humidity;
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return 0;
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}
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// Process sensor UART
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void tick() override {
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_read();
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}
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protected:
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// ---------------------------------------------------------------------
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// Protected
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// ---------------------------------------------------------------------
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void _parse() {
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#if SENSOR_DEBUG
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DEBUG_MSG_P(PSTR("[SENSOR] SM300D2: %s\n"), hexEncode(_buffer).c_str());
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#endif
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// check second header byte
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if (_buffer[1] != 0x02) {
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#if SENSOR_DEBUG
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DEBUG_MSG_P(PSTR("[SENSOR] SM300D2: Wrong header\n"));
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#endif
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return;
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}
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// check crc
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uint8_t crc = 0;
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for (unsigned char i=0; i<16; i++) crc += _buffer[i];
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if (crc != _buffer[16]) {
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#if SENSOR_DEBUG
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DEBUG_MSG_P(PSTR("[SENSOR] SM300D2: Wrong CRC\n"));
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#endif
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return;
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}
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// CO2
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_co2 = 256 * _buffer[2] + _buffer[3];
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// CH2O
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_ch2o = 256 * _buffer[4] + _buffer[5];
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// TVOC
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_tvoc = 256 * _buffer[6] + _buffer[7];
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// PM 2.5
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_pm25 = 256 * _buffer[8] + _buffer[9];
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// PM 10
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_pm100 = 256 * _buffer[10] + _buffer[11];
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// Temperature
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_temperature = (_buffer[12] & 0x7F) + (float) _buffer[13] / 10.0;
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if ((_buffer[12] & 0x80) == 0x80) {
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_temperature = -_temperature;
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}
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// Humidity
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_humidity = _buffer[14] + (float) _buffer[15] / 10.0;
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}
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void _read() {
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while(_serial->available()) {
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unsigned char ch = _serial->read();
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if ((_position > 0) || (ch == 0x3C)) {
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_buffer[_position] = ch;
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_position++;
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if (_position == 17) {
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_position = 0;
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_parse();
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}
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}
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yield();
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}
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}
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// ---------------------------------------------------------------------
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unsigned char _buffer[17] = {0};
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unsigned char _position = 0;
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double _co2 = 0;
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double _ch2o = 0;
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double _tvoc = 0;
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double _pm25 = 0;
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double _pm100 = 0;
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double _temperature = 0;
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double _humidity = 0;
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Stream* _serial { nullptr };
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};
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#endif // SENSOR_SUPPORT && SM300D2_SUPPORT
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