[sdiy] Microchip PIC 5 x 4 matrix

[john slee]

On 8 October 2015 at 00:52, Jean-Pierre Desrochers <jpdesroc at oricom.ca> wrote:
> I'm about to build a MIDI foot controller
> using around 20 normally open footswitches
> with there respective state LEDs.

I've mentioned Microchip's MCP23017/23S17 here before so I'll be
brief. I like them! Similar principle to PCF8574 except 16 GPIO and
two interrupt pins. Three of those would give you 24 switches and 24
LEDs. They're quite pleasant to program, IMHO.

John