calibrate_and_read.ino

/*******************************************************************************
 * Calibrate the MQ131 and start sampling every 60 seconds
 * 
 * Example code base on low concentration sensor (black bakelite)
 * and load resistance of 1MOhms
 * 
 * Schematics and details available on https://github.com/ostaquet/Arduino-MQ131-driver
 ******************************************************************************
 * MIT License
 *
 * Copyright (c) 2018 Olivier Staquet
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *******************************************************************************/

#include <MQ131.h>

void setup() {
  Serial.begin(115200);

  // Init the sensor
  // - Heater control on pin 2
  // - Sensor analog read on pin A0
  // - Model LOW_CONCENTRATION
  // - Load resistance RL of 1MOhms (1000000 Ohms)
  MQ131.begin(2,A0, LOW_CONCENTRATION, 1000000);  

  Serial.println("Calibration in progress...");
  
  MQ131.calibrate();
  
  Serial.println("Calibration done!");
  Serial.print("R0 = ");
  Serial.print(MQ131.getR0());
  Serial.println(" Ohms");
  Serial.print("Time to heat = ");
  Serial.print(MQ131.getTimeToRead());
  Serial.println(" s");
}

void loop() {
  Serial.println("Sampling...");
  MQ131.sample();
  Serial.print("Concentration O3 : ");
  Serial.print(MQ131.getO3(PPM));
  Serial.println(" ppm");
  Serial.print("Concentration O3 : ");
  Serial.print(MQ131.getO3(PPB));
  Serial.println(" ppb");
  Serial.print("Concentration O3 : ");
  Serial.print(MQ131.getO3(MG_M3));
  Serial.println(" mg/m3");
  Serial.print("Concentration O3 : ");
  Serial.print(MQ131.getO3(UG_M3));
  Serial.println(" ug/m3");

  delay(60000);
}