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Updated examples (Issue 26)

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miguel5612
2020-04-20 19:23:45 -05:00
parent a906388c5c
commit b9a5e62899
3 changed files with 82 additions and 10 deletions
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36
examples/MQ-7/MQ-7.ino
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@ -13,6 +13,10 @@
modified 26 March 2020
by Miguel Califa
Updated example of MQ-7 AND MQ-309A
modified 20 April 2020
by Miguel Califa
Wiring:
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
@ -31,14 +35,16 @@
#define type "MQ-7" //MQ7
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
#define RatioMQ7CleanAir 27.5 //RS / R0 = 27.5 ppm
//#define calibration_button 13 //Pin to calibrate your sensor
#define PWMPin 5 // Pin connected to mosfet
//Declare Sensor
MQUnifiedsensor MQ7(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
unsigned long oldTime = 0;
void setup() {
//Init the serial port communication - to debug the library
Serial.begin(9600); //Init serial port
pinMode(PWMPin, OUTPUT);
//Set math model to calculate the PPM concentration and the value of constants
MQ7.setRegressionMethod(1); //_PPM = a*ratio^b
@ -87,8 +93,28 @@ void setup() {
}
void loop() {
MQ7.update(); // Update data, the arduino will be read the voltage on the analog pin
MQ7.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ7.serialDebug(); // Will print the table on the serial port
delay(500); //Sampling frequency
// 60s cycle
oldTime = millis();
while(millis() - oldTime <= (60*1000))
{
// VH 5 Volts
analogWrite(5, 255); // 255 is DC 5V output
MQ7.update(); // Update data, the arduino will be read the voltage on the analog pin
MQ7.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ7.serialDebug(); // Will print the table on the serial port
delay(500); //Sampling frequency
}
// 90s cycle
oldTime = millis();
while(millis() - oldTime <= (90*1000))
{
// VH 1.4 Volts
analogWrite(5, 20); // 255 is 100%, 20.4 is aprox 8% of Duty cycle for 90s
MQ7.update(); // Update data, the arduino will be read the voltage on the analog pin
MQ7.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ7.serialDebug(); // Will print the table on the serial port
delay(500); //Sampling frequency
}
// Total: 60 + 90s = 2.5 minutes.
}