Air quality sensor: MQ135

This example is for Wiring version 1.0 build 0100+. If you have a previous version, use the examples included with your software. If you see any errors or have comments, please let us know.

Reading a SHARP GP2D12/120 Infrared Ranger by BARRAGAN

Demonstrates how to connect and read values from a SHARP GP2D12 and GP2D120 family of infrared Ranger sensors. The ranger is connected to analog input pin 0. The value read from the sensor is proportional to the distance to an object or obstacle The value read is printed to the serial monitor

int sensorValue;

void setup()
  Serial.begin(9600);  // sets the serial port to 9600

void loop()
  sensorValue = analogRead(0);       // read analog input pin 0
  Serial.println(sensorValue, DEC);  // prints the value read
  delay(100);                        // wait 100ms for next reading