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189 lines
5.2 KiB
189 lines
5.2 KiB
// -----------------------------------------------------------------------------
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// T6613 CO2 sensor
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// https://www.amphenol-sensors.com/en/telaire/co2/525-co2-sensor-modules/321-t6613
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// Uses SoftwareSerial library
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// Copyright (C) 2017-2019 by Xose Pérez <xose dot perez at gmail dot com>
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// -----------------------------------------------------------------------------
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#if SENSOR_SUPPORT && T6613_SUPPORT
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#pragma once
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#include <Arduino.h>
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#include <SoftwareSerial.h>
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#include "BaseSensor.h"
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#define T6613_REQUEST_LEN 5
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#define T6613_RESPONSE_LEN 5
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#define T6613_TIMEOUT 1000
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#define T6613_GETPPM 0x020203
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class T6613Sensor : public BaseSensor {
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public:
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// ---------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------
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T6613Sensor(): BaseSensor() {
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_count = 1;
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_sensor_id = SENSOR_T6613_ID;
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}
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~T6613Sensor() {
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if (_serial) delete _serial;
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}
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// ---------------------------------------------------------------------
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void setRX(unsigned char pin_rx) {
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if (_pin_rx == pin_rx) return;
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_pin_rx = pin_rx;
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_dirty = true;
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}
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void setTX(unsigned char pin_tx) {
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if (_pin_tx == pin_tx) return;
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_pin_tx = pin_tx;
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_dirty = true;
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}
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// ---------------------------------------------------------------------
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unsigned char getRX() {
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return _pin_rx;
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}
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unsigned char getTX() {
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return _pin_tx;
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}
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// ---------------------------------------------------------------------
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// Sensor API
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// ---------------------------------------------------------------------
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// Initialization method, must be idempotent
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void begin() {
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if (!_dirty) return;
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if (_serial) delete _serial;
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_serial = new SoftwareSerial(_pin_rx, _pin_tx, false, 32);
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_serial->enableIntTx(false);
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_serial->begin(19200);
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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() {
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char buffer[28];
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snprintf(buffer, sizeof(buffer), "T6613 @ SwSerial(%u,%u)", _pin_rx, _pin_tx);
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return String(buffer);
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}
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// Descriptive name of the slot # index
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String slot(unsigned char index) {
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return description();
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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) {
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char buffer[8];
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snprintf(buffer, sizeof(buffer), "%u:%u", _pin_rx, _pin_tx);
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return String(buffer);
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}
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// Type for slot # index
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unsigned char type(unsigned char index) {
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if (index == 0) return MAGNITUDE_CO2;
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return MAGNITUDE_NONE;
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}
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void pre() {
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_read();
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}
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// Current value for slot # index
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double value(unsigned char index) {
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if (index == 0) return _co2;
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return 0;
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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 _write(unsigned char * command) {
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_serial->write(command, T6613_REQUEST_LEN);
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_serial->flush();
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}
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void _write(unsigned int command, unsigned char * response) {
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unsigned char buffer[T6613_REQUEST_LEN] = {0};
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buffer[0] = 0xFF;
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buffer[1] = 0xFE;
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buffer[2] = command >> 16;
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buffer[3] = (command >> 8) & 0xFF;
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buffer[4] = command & 0xFF;
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_write(buffer);
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if (response != NULL) {
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unsigned long start = millis();
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while (_serial->available() == 0) {
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if (millis() - start > T6613_TIMEOUT) {
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_error = SENSOR_ERROR_TIMEOUT;
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return;
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}
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yield();
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}
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_serial->readBytes(response, T6613_RESPONSE_LEN);
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}
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}
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void _write(unsigned int command) {
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_write(command, NULL);
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}
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void _read() {
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unsigned char buffer[T6613_RESPONSE_LEN] = {0};
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_write(T6613_GETPPM, buffer);
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// Check response
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if ((buffer[0] == 0xFF)
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&& (buffer[1] == 0xFA)
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&& (buffer[2] == 0x02)) {
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unsigned int value = buffer[3] * 256 + buffer[4];
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if (0 <= value && value <= 5000) {
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_co2 = value;
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_error = SENSOR_ERROR_OK;
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} else {
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_error = SENSOR_ERROR_OUT_OF_RANGE;
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}
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} else {
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_error = SENSOR_ERROR_CRC;
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}
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}
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double _co2 = 0;
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unsigned int _pin_rx;
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unsigned int _pin_tx;
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SoftwareSerial * _serial = NULL;
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};
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#endif // SENSOR_SUPPORT && T6613_SUPPORT
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