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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!
Pasta Making Class
Cake Decorating Class
Yes, or where you don't want to injure any people. Like at the beach for example :)
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re-foam your old speakers
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Audio Via Built In Bluetooth for any Speaker System
Raspberry Pi Temperature & Humidity Network Monitor
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Make your own cellphone from scratch.
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