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Fixed MQ-131 Issue

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miguel5612 2020-04-20 19:40:27 -05:00
parent b9a5e62899
commit 688827ffb4
3 changed files with 23 additions and 1 deletions
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5
examples/MQ-131/MQ-131.ino
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@ -17,6 +17,8 @@
https://github.com/miguel5612/MQSensorsLib_Docs/blob/master/static/img/MQ_Arduino.PNG
Please take care, arduino A0 pin represent the analog input configured on #define pin
Note: high concentration MQ-131 sensor.
This example code is in the public domain.
*/
@ -83,11 +85,12 @@ void setup() {
if(calcR0 == 0){Serial.println("Warning: Conection issue founded, R0 is zero (Analog pin with short circuit to ground) please check your wiring and supply"); while(1);}
/***************************** MQ CAlibration ********************************************/
MQ131.serialDebug(true);
Serial.println("Ignore Ratio = RS/R0, for this example we will use readSensorR0Rs, the ratio calculated will be R0/Rs. Thanks :)");
}
void loop() {
MQ131.update(); // Update data, the arduino will be read the voltage on the analog pin
MQ131.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ131.readSensorR0Rs(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ131.serialDebug(); // Will print the table on the serial port
delay(500); //Sampling frequency
}

18
src/MQUnifiedsensor.cpp
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@ -143,6 +143,24 @@ float MQUnifiedsensor::readSensor()
//if(_PPM > 10000) _PPM = 99999999; //No negative values accepted or upper datasheet recomendation.
return _PPM;
}
float MQUnifiedsensor::readSensorR0Rs()
{
//More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
_RS_Calc = ((_VOLT_RESOLUTION*_RL)/_sensor_volt)-_RL; //Get value of RS in a gas
if(_RS_Calc < 0) _RS_Calc = 0; //No negative values accepted.
_ratio = this->_R0/_RS_Calc; // Get ratio RS_air/RS_gas <- INVERTED for MQ-131 issue 28 https://github.com/miguel5612/MQSensorsLib/issues/28
if(_ratio <= 0) _ratio = 0; //No negative values accepted or upper datasheet recomendation.
if(_regressionMethod == 1) _PPM= _a*pow(_ratio, _b); // <- Source excel analisis https://github.com/miguel5612/MQSensorsLib_Docs/tree/master/Internal_design_documents
else
{
// https://jayconsystems.com/blog/understanding-a-gas-sensor <- Source of linear ecuation
double ppm_log = (log10(_ratio)-_b)/_a; //Get ppm value in linear scale according to the the ratio value
_PPM = pow(10, ppm_log); //Convert ppm value to log scale
}
if(_PPM < 0) _PPM = 0; //No negative values accepted or upper datasheet recomendation.
//if(_PPM > 10000) _PPM = 99999999; //No negative values accepted or upper datasheet recomendation.
return _PPM;
}
float MQUnifiedsensor::calibrate(float ratioInCleanAir) {
//More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
/*

1
src/MQUnifiedsensor.h
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@ -30,6 +30,7 @@ class MQUnifiedsensor
//user functions
float calibrate(float ratioInCleanAir);
float readSensor();
float readSensorR0Rs();
float validateEcuation(float ratioInput = 0);
//get function for info