This is a Windows application that communicates with the included Arduino code to control a PWM pin (pin 9). This is meant to be used in conjunction with a circuit controlling lights, but do whatever you want; I don't really care.
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Load the Arduino/CLC/CLC.ino program onto your Arduino
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Simply put the "CLC app" directory wherever you want and run CLC.exe
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Choose the sound device you want to monitor with the first dropdown
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Choose the COM port your arduino is on with the second dropdown