Simple Creation - Light Alarm
This experiment is really interesting – to apply a DIY phototransistor. DIY phototransistors use the glow effect and photoelectric effect of LEDs – they will generate weak currents when some light is shined on it. And we use a transistor to amplify the currents generated, so the Arduino Uno board ca...
By: primerobotics
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By: primerobotics
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[original story: Instructables]