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Bug 44 added heating flags

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miguel5612 2022-03-20 08:48:12 -05:00
parent c934152cd7
commit 6aa78fd575
1 changed files with 31 additions and 1 deletions
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32
examples/MQ-9/MQ-9.ino
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@ -25,12 +25,14 @@
#include <MQUnifiedsensor.h>
/************************Hardware Related Macros************************************/
#define Board ("Arduino UNO")
#define Pin (A9) //Analog input 4 of your arduino
#define Pin (A0) //Analog input 4 of your arduino
/***********************Software Related Macros************************************/
#define Type ("MQ-9") //MQ9
#define Voltage_Resolution (5)
#define ADC_Bit_Resolution (10) // For arduino UNO/MEGA/NANO
#define RatioMQ9CleanAir (9.6) //RS / R0 = 60 ppm
#define PreaheatControlPin5 (3) // Preaheat pin to control with 5 volts
#define PreaheatControlPin14 (4) // Preaheat pin to control with 1.4 volts
/*****************************Globals***********************************************/
//Declare Sensor
MQUnifiedsensor MQ9(Board, Voltage_Resolution, ADC_Bit_Resolution, Pin, Type);
@ -38,6 +40,8 @@ MQUnifiedsensor MQ9(Board, Voltage_Resolution, ADC_Bit_Resolution, Pin, Type);
void setup() {
//Init the serial port communication - to debug the library
Serial.begin(9600); //Init serial port
pinMode(PreaheatControlPin5, OUTPUT);
pinMode(PreaheatControlPin14, OUTPUT);
//Set math model to calculate the PPM concentration and the value of constants
MQ9.setRegressionMethod(1); //_PPM = a*ratio^b
@ -66,6 +70,26 @@ void setup() {
// 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
// ISSUE 44 - MQ9 needs a low/high temperature cycle like MQ7 #44
Serial.println("Preheating, please wait 2.5 minutes");
digitalWrite(PreaheatControlPin5, HIGH);
digitalWrite(PreaheatControlPin14, LOW);
delay(60000);
digitalWrite(PreaheatControlPin5, LOW);
digitalWrite(PreaheatControlPin14, HIGH);
delay(90000);
digitalWrite(PreaheatControlPin5, HIGH);
digitalWrite(PreaheatControlPin14, LOW);
delay(60000);
digitalWrite(PreaheatControlPin5, LOW);
digitalWrite(PreaheatControlPin14, HIGH);
delay(90000);
digitalWrite(PreaheatControlPin5, HIGH);
digitalWrite(PreaheatControlPin14, LOW);
// End pre-heat cycle
Serial.print("Calibrating please wait.");
float calcR0 = 0;
for(int i = 1; i<=10; i ++)
@ -84,6 +108,12 @@ void setup() {
}
void loop() {
digitalWrite(PreaheatControlPin5, LOW);
digitalWrite(PreaheatControlPin14, HIGH);
delay(90000);
digitalWrite(PreaheatControlPin5, HIGH);
digitalWrite(PreaheatControlPin14, LOW);
MQ9.update(); // Update data, the arduino will be read the voltage on the analog pin
MQ9.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ9.serialDebug(); // Will print the table on the serial port