Re: Interface to 4x4 Keypad
Since I set the columns high and rows as input but each row has a pull-up resistor. So the inputs of row would be high. When key is depressed, say 1. The software will carry algorithm such as setting column to zero one by one. For example:
0111
1011
1101
1110
While key "1" is depressed and column number 1 set to zero which will override row 1 to zero. As button 1 releases, the 1st row will go back to one due to a pull-up resistor. Is that correct?
MM