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improved CO2 code (details https://forum.airgradient.com/t/s8-co2-reading-of-1/69/15)

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Achim
2022-01-20 08:26:27 +07:00
parent ff34d2c143
commit 0b8408ef13
1 changed files with 17 additions and 37 deletions
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54
AirGradient.cpp
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@ -607,47 +607,27 @@ const char* AirGradient::getCO2(int retryLimit) {
return Char_CO2;
}
int AirGradient::getCO2_Raw(){
int retry = 0;
CO2_READ_RESULT result;
const byte CO2Command[] = {0xFE, 0X44, 0X00, 0X08, 0X02, 0X9F, 0X25};
byte CO2Response[] = {0,0,0,0,0,0,0};
const byte CO2Command[] = {0xFE, 0X44, 0X00, 0X08, 0X02, 0X9F, 0X25};
byte CO2Response[] = {0,0,0,0,0,0,0};
while(!(_SoftSerial_CO2->available())) {
retry++;
// keep sending request until we start to get a response
_SoftSerial_CO2->write(CO2Command, 7);
delay(50);
if (retry > 10) {
return -1;
}
}
int timeout = 0;
while (_SoftSerial_CO2->available() < 7) {
timeout++;
if (timeout > 10) {
while(_SoftSerial_CO2->available())
_SoftSerial_CO2->read();
break;
}
delay(50);
}
_SoftSerial_CO2->write(CO2Command, 7);
delay(100); //give the sensor a bit of time to respond
if (_SoftSerial_CO2->available()){
for (int i=0; i < 7; i++) {
int byte = _SoftSerial_CO2->read();
if (byte == -1) {
result.success = false;
return -1;
}
CO2Response[i] = byte;
}
int valMultiplier = 1;
int high = CO2Response[3];
int low = CO2Response[4];
unsigned long val = high*256 + low;
int byte = _SoftSerial_CO2->read();
CO2Response[i] = byte;
if (CO2Response[0] != 254) {
return -1; //error code for debugging
}
}
unsigned long val = CO2Response[3]*256 + CO2Response[4];
return val;
}
else
{
return -2; //error code for debugging
}
}
//END CO2 FUNCTIONS //