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Modified fctn to get voltage

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miguel5612
2019-06-01 18:00:10 -05:00
parent 74e8f045aa
commit 434e454688
3 changed files with 37 additions and 16 deletions
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25
src/MQUnifiedsensor.cpp
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@ -527,7 +527,7 @@ int MQUnifiedsensor::readPPM(int m, int b) {
double ppm = pow(10, ppm_log); //Convert ppm value to log scale
return floor(ppm);
}
float MQUnifiedsensor::calibrate(boolean print) {
long MQUnifiedsensor::calibrate(boolean print) {
//More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
/*
V = I x R
@ -541,9 +541,8 @@ float MQUnifiedsensor::calibrate(boolean print) {
RS = [(VC x RL) / VRL] - RL
*/
_sensor_volt; //Define variable for sensor voltage
float RS_air; //Define variable for sensor resistance
float R0; //Define variable for R0
float sensorValue; //Define variable for analog readings
long RS_air; //Define variable for sensor resistance
long R0; //Define variable for R0
_sensor_volt = this->getVoltage(); //Convert average to voltage
RS_air = ((_VOLT_RESOLUTION*_RLValue)/_sensor_volt)-_RLValue; //Calculate RS in fresh air
R0 = RS_air/_ratioInCleanAir; //Calculate R0
@ -560,15 +559,17 @@ float MQUnifiedsensor::calibrate(boolean print) {
}
return R0;
}
double MQUnifiedsensor::getVoltage() {
double avg = 0.0;
for (int i = 0; i < retries; i ++) {
avg += analogRead(this->_pin) / retries;
delay(retry_interval);
double MQUnifiedsensor::getVoltage(int read) {
double voltage = _sensor_volt;
if(read)
{
double avg = 0.0;
for (int i = 0; i < retries; i ++) {
avg += analogRead(this->_pin) / retries;
delay(retry_interval);
}
voltage = avg * _VOLT_RESOLUTION / (pow(2, ADC_RESOLUTION) - 1);
}
double voltage = avg * _VOLT_RESOLUTION / (pow(2, ADC_RESOLUTION) - 1);
return voltage;
}
void MQUnifiedsensor::setR0(double R0) {

4
src/MQUnifiedsensor.h
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@ -274,8 +274,8 @@ class MQUnifiedsensor
int readSensor(String nameLectureRequeired = "", bool print = false);
int readPPM(int m, int b);
float calibrate(boolean print = false);
double getVoltage();
long calibrate(boolean print = false);
double getVoltage(int read = true);
double stringToDouble(String & str);
String getnameLecture();