it's pretty much what the title says, i've like 5 pins left and i need 7 for 4x3 keypad i know how it works with scanning that's why an encoder won't really work here, i've seen a solution where they use variable resistances on the columns with common cathode and the rows are common anode (or rows …

decreasing keypad pins

CrossRoads May 16, 2014, 4:24am 3

Can you add a shift out register and a shift in register to your project?

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