Another hacking project... I took apart my old 2 1/2 octave keyboard, and it has an incredibly easy-to-hack mechanism, just a button for each key going to a 4x8 ribbon cable (for 32 keys). That is to say, there is a row of 32 buttons spit into 4 groups of 8. Each group is connected to the same pin o…

can I use a 74HC595 shift register instead of 8 transistors?

CrossRoads March 2, 2015, 12:19am 3

Use interrupt from the diodes to know when to sample.

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