MQ-135 Sensor (CO2, Benzyne) with Arduino | Sheekar Banerjee

1//Coded and tested by: 
2//Sheekar Banerjee, AI-ML-IOT Solution Engineer
3  and Researcher
4
5void setup() {
6  // initialize serial communication at
7  9600 bits per second:
8  Serial.begin(9600);
9}
10
11void loop() {
12  //
13  read the input on analog pin 0:
14  int sensorValue = analogRead(A0);
15  Serial.println("The
16  amount of CO2 (in PPM): ");
17  Serial.println(sensorValue);
18  delay(2000);
19}

1//Coded and tested by:
2//Sheekar Banerjee, AI-ML-IOT Solution Engineer  and Researcher
3
4int R0 = 176;
5int R2 = 1000;
6float RS;
7float PPM_acetone;
8  
9void setup() {
10   Serial.begin(9600);
11}
12 
13void loop() {
14   //  read the input on analog pin 0:
15   int sensorValue = analogRead(A0);
16   //  convert to voltage:
17   float volts = sensorValue * 5;
18   volts = volts / 1023;
19   // calculate RS
20   RS = R2 * (1-volts);
21   RS = RS/volts;
22   // calculate  acetone PPM
23   PPM_acetone = 159.6 - 133.33*(RS/R0);
24   // print out the acetone  concentration:
25   Serial.println("Acetone (C3H6O) Value: ");
26   Serial.println(PPM_acetone);
27   delay(3000); // delay in between reads for stability
28}

1//Coded and tested by: 
2//Sheekar Banerjee, AI-ML-IOT Solution Engineer  and Researcher
3
4void setup() {
5  // initialize serial communication at  9600 bits per second:
6  Serial.begin(9600);
7}
8
9void loop() {
10  //  read the input on analog pin 0:
11  int sensorValue = analogRead(A0);
12  Serial.println("The  amount of CO2 (in PPM): ");
13  Serial.println(sensorValue);
14  delay(2000);
15}