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Yes, you can replace the photoresistor with a reed switch (like thishttps://www.amazon.com/Directed-Electronics-8600-Magnetic-Switch/dp/B0009SUEZY) and read its state with the analog input of the Arduino.
3D Printing Class
Very beautiful execution!
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Yes, or where you don't want to injure any people. Like at the beach for example :)
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