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Raspberry Pi 2
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A rather hard-to-break box
Be careful to choose one with a large enough opening for the Pi’s power cable as well as sufficient space so that the solenoid can be attached such that it blocks the door when it's closed.
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A small protoboard
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Resistors
We used three 10 ohm resistors in parallel to obtain 3.3 ohms resistance (which we recommend to have a greater max current) and two 470 ohm resistors to obtain 235 ohms for R2 (though here a single 220 ohms would work)
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1N4148 diode
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2N2222 transistor
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Assorted protoboard wires
Male-male and male-female
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5V Solenoid
https://www.sparkfun.com/products/11015
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