Multiple keypad.

[fredericplante]

This is not really an issue, I was wondering if there were ways to scan 4 keypads, using your library?

[arduino12]

Each keypad needs clk_pin and data_pin, so for the price of 8 gpio pins you can,
But I think you can connect all clk_pins together to the same arduino pin- for a total of 5 pins for 4 keypads.

[fredericplante]

In any ways, it would require 4cs pin + clk and data, if I put some chip select on the 4 them, using a 74**00, for exemple,

[fredericplante]

Yeap, that would work.