GY-63_MS5611/libraries/MHZCO2/MHZCO2.cpp
2023-11-14 10:25:54 +01:00

215 lines
3.2 KiB
C++

//
// FILE: MHZCO2.cpp
// AUTHOR: Rob Tillaart
// VERSION: 0.1.4
// PURPOSE: Arduino Library for MHZ series CO2 sensors
// DATE: 2020-05-05
// URL: https://github.com/RobTillaart/MHZCO2
#include "MHZCO2.h"
MHZCO2::MHZCO2()
{
_startTime = millis();
}
void MHZCO2::begin(Stream * str)
{
_str = str;
_lastMeasurement = 0;
_PPM = 0;
_CO2 = 0;
_temperature = 0;
_accuracy = 0;
_minCO2 = 0;
}
uint32_t MHZCO2::uptime()
{
return millis() - _startTime;
}
void MHZCO2::setPPM(uint16_t PPM)
{
_PPM = PPM;
uint8_t data[9] = {0xFF, 0x01, 0x99, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
data[8] = PPM >> 8;
data[7] = PPM & 0xFF;
data[8] = checksum(data);
send(data, 9);
}
uint16_t MHZCO2::getPPM()
{
return _PPM;
}
int MHZCO2::measure()
{
_lastMeasurement = millis();
uint8_t data[9] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
data[8] = checksum(data);
send(data, 9);
int rv = receive(data);
// allow partial good data?
if ((rv == MHZCO2_OK) || (rv == MHZCO2_ERROR_CRC))
{
_CO2 = data[2] * 256 + data[3];
_temperature = data[4] - 40;
_accuracy = data[5];
_minCO2 = data[6] * 256 + data[7];
}
return rv;
}
uint32_t MHZCO2::lastMeasurement()
{
return _lastMeasurement;
}
int MHZCO2::getCO2()
{
return _CO2;
};
int MHZCO2::getTemperature()
{
return _temperature;
};
int MHZCO2::getAccuracy()
{
return _accuracy;
}
int MHZCO2::getMinCO2()
{
return _minCO2;
};
void MHZCO2::calibrateZero()
{
uint8_t data[9] = {0xFF, 0x01, 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
data[8] = checksum(data);
send(data, 9);
}
void MHZCO2::calibrateSpan(uint16_t span)
{
uint8_t data[9] = {0xFF, 0x01, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
data[3] = span >> 8;
data[4] = span & 0xFF;
data[8] = checksum(data);
send(data, 9);
}
void MHZCO2::calibrateAuto(bool mode)
{
uint8_t data[9] = {0xFF, 0x01, 0x79, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
if (mode) data[3] = 0xA0;
data[8] = checksum(data);
send(data, 9);
}
/////////////////////////////////////////////////
//
// PROTECTED
//
void MHZCO2::send(uint8_t * data, uint8_t len)
{
_str->write(data, len);
_str->flush();
}
int MHZCO2::receive(uint8_t * answer)
{
uint32_t start = millis();
while (_str->available() == 0)
{
if (millis() - start > 1000) return MHZCO2_TIMEOUT;
}
for (uint8_t i = 0; i < 9; i++)
{
answer[i] = _str->read();
}
// verify checksum
if (answer[8] != checksum(answer)) return MHZCO2_ERROR_CRC;
return MHZCO2_OK;
}
uint8_t MHZCO2::checksum(uint8_t *arr)
{
uint8_t sum = 0;
for (uint8_t i = 1; i < 8; i++)
{
sum += arr[i];
}
sum = 0xFF - sum;
return sum + 1;
}
/* slightly faster
uint8_t MHZCO2::checksum(uint8_t *arr)
{
uint8_t sum = 0xFF;
for (uint8_t i = 1; i < 8; i++) sum -= arr[i];
return sum + 1;
}
*/
/////////////////////////////////////////////////////////
//
// DERIVED CLASSES
//
MHZ1311A::MHZ1311A() : MHZCO2()
{
}
MHZ19::MHZ19() : MHZCO2()
{
}
MHZ19B::MHZ19B() : MHZCO2()
{
}
MHZ19C::MHZ19C() : MHZCO2()
{
}
MHZ19D::MHZ19D() : MHZCO2()
{
}
MHZ19E::MHZ19E() : MHZCO2()
{
}
// -- END OF FILE --