Raspberry Pi (512 MB, slow processor) running Linux and Java to abuse the SPI pins to drive a chain of three Max 7219 modules (slightly out of spec), and abuse GPIO to multiplex scan a pair of 4x4 keypads.
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Java Pi Max 7219 modules

Uploaded 2 years ago

Raspberry Pi (512 MB, slow processor) running Linux and Java to abuse the SPI pins to drive a chain of three Max 7219 modules (slightly out of spec), and abuse GPIO to multiplex scan a pair of 4x4 keypads.