Push Button Switch

Projects General Guidance
1

Hi,
I was wondering, how I can connect a 400 Push Button Switch together using Arduino UNO board??
Thank you for helping

2

You can maybe use two of these 16-Bit Serial/Parallel-In, Serial-Out Shift Register with two 16-bit Shift-in Register and make a 20x20 keypad.

3

I was wondering, how I can connect a 400 Push Button Switch together using Arduino UNO board??

WHOUOOH 1
That's alot of soldering !

4

I hope I don't need more than that :slight_smile:

5

Try and buy either of those 16-bit parts.

Mega and Keypad.h could probably do 20x20 button matrix.
Otherwise, 3 shift-in registers and 3 shift-out registers, all daisy chained with SPI for fast writing & reading. Could scan continuously, or diode-AND the shift-in inputs to create an interrupt and just scan when a button was pressed.