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The circuit originally ran from the through the resistors into the switches in the center and back out into the desired port on the Arduino. The code provided read input from the switches and played a buzz on the speaker. To add the LEDs into the circuit I placed them in a way that they would be after the switches in the circuit and before the wires running back to the ports. Certain colors of LEDs took too much to light which possibly kept the speaker from buzzing sometimes, but aside from that the addition was smooth and simple.
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Diagram:
