read about the idea of kbd using single i/o line. i think we can improve this by.

1. introducing an diode parallel to the Rs so that C charges rapidly when i/o line is at logic '1' bypassing the rs.

2. using resistances like we use in R2R ladder and connecting buttons to the junctions of resistances and the ground. this will resolve the problem of multiple key presses by only detecting a key nearest to Rs

will this work?


abhishek singh