Troubleshooting help about dumbpad

[imchipwood]

So, keyboards measure keypresses in a row/column matrix. A single key press causes a voltage drop across a diode on two pins - a row pin, and a column pin. Multiple keypresses compound this - by measuring the voltage on each pin of the matrix, you can determine which key(s) were pressed.

Therefore, measuring the continuity from one pin doesn't really tell you much of anything. In order for a single key to work, continuity must be good between each key, diode, and microcontroller pin for the entire row and column.

I would open the schematic for the combo_oled board (download KiCAD), and check continuity between every single connection.

Or just resolder every single diode/switch/microcontroller pin..

[afishydeath]

Okay, I'll give that a try.

[imchipwood]

Closing issue due to no updates in a few months. Please reopen if you're still having issues.