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miguel5612 2019-05-29 20:41:04 -05:00
parent 1a4c91528d
commit 1924e21e61
3 changed files with 24 additions and 5 deletions
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18
examples/MQ-2/MQ-2.ino
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@ -20,18 +20,32 @@
#define pin A0 //Analog input 0 of your arduino
#define type 2 //MQ2
/***************************** MQInicializar****************************************
Input: pin, type
Output:
Remarks: This function create the sensor object.
************************************************************************************/
//Declare Sensor
MQUnifiedsensor MQ2(pin, type);
void setup() {
//Init serial port
Serial.begin(115200);
/***************************** MQInicializar****************************************
Input:
Output:
Remarks: This function configure the pinMode
************************************************************************************/
//init the sensor
MQ2.inicializar();
}
void loop() {
void loop() {
/***************************** MQReadSensor ****************************************
Input: Gas - Serial print flag
Output: Value in PPM
Remarks: This function use readPPM to read the value in PPM the gas in the air.
************************************************************************************/
//Read the sensor and print in serial port
int lecture = MQ2.readSensor("", true);
delay(400);

3
src/MQUnifiedsensor.cpp
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@ -141,8 +141,7 @@ double MQUnifiedsensor::calibrate() {
float R0; //Define variable for R0
float sensorValue; //Define variable for analog readings
sensor_volt = this->getVoltage(); //Convert average to voltage
RS_air = (5.0-sensor_volt)/sensor_volt; // omit *RL
R0 = RS_air / _ratioInCleanAir; //Calculate R0
R0 = sensor_volt / _ratioInCleanAir; //Calculate R0
return R0;
}
double MQUnifiedsensor::getVoltage() {

8
src/MQUnifiedsensor.h
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@ -7,6 +7,8 @@
//Count of posible lectures
#define lecturesAvailable 19
/************************Hardware Related Macros************************************/
//Index in the nameLecture vector
#define defaultMQ2 "LPG" // LPG
#define defaultMQ3 "Alcohol" // Alcohol
@ -21,6 +23,7 @@
#define defaultMQ303 "Isobutano" //Isobutano
#define defaultMQ309 "CO" //CO
/*****************************Globals***********************************************/
#define RatioMQ2CleanAir 1
#define RatioMQ3CleanAir 2
#define RatioMQ4CleanAir 3
@ -34,12 +37,15 @@
#define RatioMQ303CleanAir 135
#define RatioMQ309CleanAir 303
/***********************Software Related Macros************************************/
#define ADC_RESOLUTION 10 // for 10bit analog to digital converter.
#define retries 50
#define retry_interval 20
//Values consolidated
/**********************Application Related Macros**********************************/
/* Gas, Value of m (Slope) and b (Cut on x axis) points */
//Values consolidated
const String PROGMEM _MQ2[18] = {"H2","-2.2459","2.9845","LPG","-2.2879","2.7901","CO","-2.6208","3.6075","Alcohol","-3.1157","4.5134","Propane","-2.7028","3.5595","Benzene","-2.2879","2.7901"};
const String PROGMEM _MQ3[18] = {"LPG","-3.1851","4.7048","CH4","-17.531","28.785","CO","-4.339","6.4432","Alcohol","-1.435","0.4103","Benzene","-2.7009","0.632","Hexane","-2.7268","3.6299"};
const String PROGMEM _MQ4[15] = {"LPG","-2.5818","3.6303","CH4","0.9873","2.6386","CO","-5.5945","5.6693","Alcohol","-11.89","9.0375","smoke","-11.189","9.0375"};