MQ-7 carbon-monoxide shield not working


co sensor shield gives out to high values when breathing in the sensor.

guess, that you also have to measure the temperature and the air humidity to calculate the co-ppm value.

am i right?

code is:

const int AOUTpin=0; int value;

void setup() { Serial.begin(9600); } void loop() { value= analogRead(AOUTpin); Serial.println(value); delay(500); }

You probably don't have any CO ppm in your breath, unless you area smoker and recently inhaled the smoke.

According to the data sheet there are no gases in your breath that the MQ-7 will detect. So, seems the device is operating correctly.