[sdiy] Microchip PIC 5 x 4 matrix

[Rick Jansen]

True, but the 9575 is not available in DIP packages, and I'm not into those smaller packages. My reading glasses don't handle those.  :-)

Rick

> On 08 Oct 2015, at 17:51, MTG <grant at musictechnologiesgroup.com> wrote:
> 
> NXP (and probably TI) make these 16-bit versions too: PCA9575 for instance. Does this PIC have I2C? Adding a bit-bang *and* a chip do the scanning is probably not the most economical for either time or money.
> 
> GB
> 
>> On 10/8/2015 1:57 AM, john slee wrote:
>>> 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
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