Arduino 5: TKThermosensor w/ Alarm, Airflow Sensor

I used the same circuit arrangement as in the last video but with the addition of a piezo speaker element. A negative-coefficient thermistor is used along with a 1K resistor as the “potentiometer” sensor input to the Arduino. Using the same code as in the Voltmeter video, I set the sensitivity of the system to be very sensitive… but nowhere nearly as sensitive as it could be. I then demonstrate the functioning using the heat from my fingers, friction heating, and the heat from my breathing. The program sketch can be downloaded from: www.mediafire.com

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