Hi,
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);
}