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Behavioral Box Miniature Electronics
There are several different types of miniature electronics- all of which are used in creating the water/food dispersal system.
One group is primarily used for the beam breaks, while the other group is used for the transduction of the beam break signal from the food/water signal to the solenoid.
The only mini-electronics used here is a 220-Ohm resistor, which is inserted through the Photo Interrupter Board.
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MOSFET: A through-hole transistor that controls the voltage passing between the Arduino/Motorshield and the solenoid.
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10K Ohm Resistor: Resistor that attenuates voltage that passes between the Arduino/Motorshield and the solenoid.
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Zener Diode: Diode that protects the Solenoids from any excessive voltage, causing current flow to reverse in case of this.