Datasheet

6
}
else digitalWrite(3,LOW);
delay(1000);
}
}
4. When the sensor is in air, the buzzer will not sound. You can blow toward the sensor, at this time, if
Oxygen concentration is lower than threshold we set, the Buzzer will sound. You can check the output
voltage (amplify 201) after opening the Serial Monitor.
We tested it in an office, so the concentration of O2 is about 20.5%.
Notice: We have adjusted the figure in a clear air, and we have updated it in the program, please refer to
the program instead of datasheet.