I've seen the technique - putting a resistive ladder on the Keypad - but you seem to be using a standard 4 x 4 keypad. Did you take the keypad to pieces and modify it?
@blahyourhamster - Nonsense! I wrote a database manager in assembler back in 1980 powered by a bottle of Bells Whisky! I still remember the night I spent 8 hours tracing a missing pair of brackets…..
….don't drink any more. Can't afford to lose any more brackets.
I've seen the technique - putting a resistive ladder on the Keypad - but you seem to be using a standard 4 x 4 keypad. Did you take the keypad to pieces and modify it?