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Extend API for optional correction factor

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Miguel Angel Califa Urquiza
2025-06-04 19:29:44 -05:00
parent 6f9b00666e
commit 30c0979cb4
30 changed files with 90 additions and 60 deletions
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5
examples/LinearVsExponential/LinearVsExponential.ino
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@ -81,17 +81,18 @@ void setup() {
void loop() {
MQ4.update(); // Update data, the arduino will read the voltage from the analog pin
float correctionFactor = 0; // Optional environmental correction
//https://jayconsystems.com/blog/understanding-a-gas-sensor
//Set math model to calculate the PPM concentration and the value of constants
MQ4.setRegressionMethod(0); //_PPM = pow(10, (log10(ratio)-b)/a)
MQ4.setA(-0.318); MQ4.setB(1.133); // A -> Slope, B -> Intersect with X - Axis
float LPG1 = MQ4.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
float LPG1 = MQ4.readSensor(false, correctionFactor); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
//Set math model to calculate the PPM concentration and the value of constants
MQ4.setRegressionMethod(1); //_PPM = a*ratio^b
MQ4.setA(1012.7); MQ4.setB(-2.786); // Configure the equation to to calculate CH4 concentration
float LPG2 = MQ4.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
float LPG2 = MQ4.readSensor(false, correctionFactor); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
// exposure to 2000 ppm of LPG gas is immediately dangerous to life and health. In this section
if(LPG1>=2000 || LPG2>=2000) Serial.println("Warning - Very high concentrations detected!");