add PCF8574(A) port expander as passive 4x4 keyboard

Open caveman99 opened this issue 1 year ago • 3 comments

untested for now, white collar code.

Mar 25 '24 23:03 caveman99

What kind of hardware would I need to test this?

May 23 '24 02:05 HarukiToreda

What kind of hardware would I need to test this?

i used https://aliexpress.com/item/1005006386752091.html for testing, but running into time constraints.

Jun 16 '24 09:06 caveman99

I've tested this this evening, and I get success finding the module:

DEBUG | ??:??:?? 1 I2C device found at address 0x20
INFO  | ??:??:?? 1 PCF8574A based keyboard found

but then I get failure to initialise it:

WARN  | ??:??:?? 7 [GPS] Failed to find GNSS Module (baudrate 9600)
ERROR | ??:??:?? 7 [matrixPE] Failed to initialize I2C keypad

So, help me @caveman99, you're my only hope!

Oct 19 '24 03:10 NomDeTom