Homemade MIDI turntable
Cheap and simple homemade MIDI turntable with GPL2 license. Using a ATmega, a HDNS-2000 optical mouse encoder, GCC-AVR, AVR-Libc and FreeRTOS.The microcontroller ATmega16 is the brain. As inputs, there is only two, the YA and YB from HDNS-2000 IC, which reside inside the optical mouse. With this two inputs, we can know the direction of movement and velocity of the turntable.As outputs, the microcontroller output information for MIDI and for three LEDs. It sends by MIDI information about the movement of turntable. One LED flash just for show activity of the microcontroller, and the other two, turn on when there is movement of the turntable.
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