Arduino-Sensor-Shield-V5.0-Rotational-Sensor to turn on he LED. the sensor must have at least or greater than 500 value and output of 125 or greater. one can also use the Arduino IDE serial plotter to ...

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Because of the affordability and seeming ubiquity of the Arduino platform, they have been hard at work this last month trying to get their Geiger counter sensor board for an Arduino out the door.