MQ7 Sensor Help.

I am currently trying to learn how to use my MQ7 Standalone CO 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:

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);

  delay(100); //Just here to slow down the output.

I’m following the setup from this Instructables:

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.