Just so OP knows all the options available, you can also apply charlieplexing for the LEDs. ![:D]( "Very Happy")
https://en.wikipedia.org/wiki/Charlieplexing
The easiest route is to stick to a keyboard matrix, of course. But in the past, there are many cool tricks to conserve GPIO lines. Like using the ADC to read keyboard switches with very few pins...![:D]( "Very Happy")
![:D]( "Very Happy")
![:D]( "Very Happy")
Edit: Charlieplexing would be inconvenient because of multiple key presses. Two Picos is still cheap, but needs communications. Two 8-bit I/O expander breakout boards can also work in place of a second Pico. PCF8574 breakout boards that use I2C can be found. Straightforward to use those for lighting any combination of indicator LEDs.
https://en.wikipedia.org/wiki/Charlieplexing
The easiest route is to stick to a keyboard matrix, of course. But in the past, there are many cool tricks to conserve GPIO lines. Like using the ADC to read keyboard switches with very few pins...
Edit: Charlieplexing would be inconvenient because of multiple key presses. Two Picos is still cheap, but needs communications. Two 8-bit I/O expander breakout boards can also work in place of a second Pico. PCF8574 breakout boards that use I2C can be found. Straightforward to use those for lighting any combination of indicator LEDs.
Statistics: Posted by katak255 — Thu Aug 22, 2024 12:33 am