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https://github.com/miguel5612/MQSensorsLib.git
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74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/*
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MQUnifiedsensor Library - reading an MQ3
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Demonstrates the use a MQ3 sensor.
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Library originally added 01 may 2019
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by Miguel A Califa, Yersson Carrillo, Ghiordy Contreras, Mario Rodriguez
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Added example
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modified 23 May 2019
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by Miguel Califa
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Updated library usage
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modified 26 March 2020
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by Miguel Califa
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This example code is in the public domain.
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*/
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//Include the library
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#include <MQUnifiedsensor.h>
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//Definitions
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#define placa "Arduino UNO"
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#define Voltage_Resolution 5
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#define pin A3 //Analog input 3 of your arduino
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#define type "MQ-3" //MQ3
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#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
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//#define calibration_button 13 //Pin to calibrate your sensor
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double alcoholPPM = 0;
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//Declare Sensor
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MQUnifiedsensor MQ3(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
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void setup() {
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//Init the serial port communication - to debug the library
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Serial.begin(9600); //Init serial port
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//Set math model to calculate the PPM concentration and the value of constants
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MQ3.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ3.setA(0.3934); MQ3.setB(-1.504); // Configurate the ecuation values to get Alcohol concentration
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/*
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Exponential regression:
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Gas | a | b
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LPG | 44771 | -3.245
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CH4 | 2*10^31| 19.01
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CO | 521853 | -3.821
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Alcohol| 0.3934 | -1.504
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Benzene| 4.8387 | -2.68
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Hexane | 7585.3 | -2.849
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*/
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// Calibration setup
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MQ3.setR0(3.86018237);
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/*
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//If the RL value is different from 10K please assign your RL value with the following method:
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MQ3.setRL(10);
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*/
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/***************************** MQ Init ********************************************/
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//Remarks: Configure the pin of arduino as input.
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/************************************************************************************/
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MQ3.init();
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}
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void loop() {
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MQ3.update(); // Update data, the arduino will be read the voltage on the analog pin
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alcoholPPM = MQ3.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
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Serial.print("Alcohol now (PPM): ");
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Serial.println(alcoholPPM);
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delay(500); //Sampling frequency
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}
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