I am currently trying to learn how to use my MQ 7 CO Standalone to read CO in the air around the sensor. Currently Im using this circuit using my Arduino Uno. I get results of 900-1000. Here's a Fritzing Schematic on my setup.
Currently this is the code I am using on the arduino:
[code]
int mqx_analogPin = A0; // connected to the output pin of MQ-X
void setup(){
Serial.begin(9600); // open serial at 9600 bps
}
void loop()
{
// give ample warmup time for readings to stabilize
int mqx_value = analogRead(mqx_analogPin);
Serial.println(mqx_value);
delay(100); //Just here to slow down the output.
}
I'm following the setup from this Instructables: http://www.instructables.com/id/Smoke-Detector/?ALLSTEPS
However his readings are around 150-200ppm outside. I'm unsure how to reach these values since im following basically everything from the guide. Does anyone any experience with a MQ7 sensor?
I've been reading I need to preheat the sensor but I can't find any circuit that clearly shows how to preheat an MQ7 sensor or find any code for the arduino.