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Picture of Arduino Pillow Theremin
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Making a Theremin is much easier than you could guess.  It requires only a couple of materials that you can easily find, and it doesn't cost much, either.  

Materials: 

Arduino Uno
Breadboard
Speaker
Wire
10 K Ohm Resistor
Photocell
USB Cord for the Arduino
Power Source

Small Pillow
Needle
Thread
Scissors

Step 1: Assembling the Wires and Parts

Picture of Assembling the Wires and Parts
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The image is exactly how the wires should be placed and connected to the arduino. If you don't have a pair of headphones that you are willing to part with, you can use a small speaker. So that mine could be louder, I decided to go with the speaker.




 

Oh man, my cats would love this!