MIDI to PWM player
This project allows you to play a MIDI file from a SD card. The MIDI file is parsed and hen primary tone is played as PWM signal, which is driving a peizo or a motor.
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Stumbled across this in Codeshare… I love the motor music!
That comes from piezo 
O Rly? Looks like a big stepper motor spinning around in that video 
“primary tone is played as PWM signal, which is driving a peizo or a motor”
Hmm, I guess you are right. I thought it was and .