I have built an exact replica of the MQ2 Smoke Sensor Breadboard setup from Derek Erb's post on the forum: http://forum.arduino.cc/index.php?topic=150861.0
Here's where my problem lies:
* The values on my serial monitor are consistent, around 659 or so (assuming on analog scale of 0 to 1023) even when there is NO smoke in the room. It would put it on a scale of 60% smoke density in the air...which definitely is NOT the case.
* When I remove the A0 input wire to the Arduino, the values drop and hover around 400...but shouldn't they go to zero? Since there's no input?
I have my simple sketch below.
Serial.begin(9600); //Set serial baud rate to 9600 bps
val=analogRead(A0); //Read Gas value from analog 0
Serial.println(val,DEC);//Print the value to serial port
I feel like it's a hardware issue more than a software issue...anything see the problem? I've attached a picture of the breadboard setup to this as well.