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Updated basic examples

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miguel5612
2020-03-27 22:03:29 -05:00
parent d0f49fa4f0
commit 9a1974033e
12 changed files with 274 additions and 27 deletions
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26
examples/MQ-2/MQ-2.ino
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@ -26,7 +26,7 @@
#define pin A0 //Analog input 0 of your arduino
#define type "MQ-2" //MQ2
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
//#define calibration_button 13 //Pin to calibrate your sensor
#define RatioMQ2CleanAir 9.83 //RS / R0 = 9.83 ppm
//Declare Sensor
MQUnifiedsensor MQ2(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
@ -48,9 +48,27 @@ void setup() {
Propane| 658.71 | -2.168
*/
// Calibration setup
MQ2.setR0(9.659574468);
/***************************** MQ CAlibration ********************************************/
// Explanation:
// In this routine the sensor will measure the resistance of the sensor supposing before was pre-heated
// and now is on clean air (Calibration conditions), and it will setup R0 value.
// We recomend execute this routine only on setup or on the laboratory and save on the eeprom of your arduino
// This routine not need to execute to every restart, you can load your R0 if you know the value
// Acknowledgements: https://jayconsystems.com/blog/understanding-a-gas-sensor
Serial.print("Calibrating please wait.");
int calcR0 = 0;
for(int i = 0; i<=10; i ++)
{
MQ2.update(); // Update data, the arduino will be read the voltage on the analog pin
calcR0 += MQ2.calibrate(RatioMQ2CleanAir);
Serial.print(".");
}
MQ2.setR0(calcR0/10);
Serial.println(" done!.");
if(isinf(calcR0)) {Serial.println("Warning: Conection issue founded, R0 is infite (Open circuit detected) please check your wiring and supply"); while(1);}
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 ********************************************/
/*
//If the RL value is different from 10K please assign your RL value with the following method:
MQ2.setRL(10);