Custom Keypad (matrix) Do we need diodes for this?

Other Hardware Sensors
1

Hello guys.
I will make 4 x 10 matrix keypad for use with arduino lonardo. But i saw some keypads have diodes. do i need this ?

{  1,  2,  3, 4, 5, 6, 7, 8, 9, 10 },
{  1,  2,  3, 4, 5, 6, 7, 8, 9, 10 },
{  1,  2,  3, 4, 5, 6, 7, 8, 9, 10 },
{  1,  2,  3, 4, 5, 6, 7, 8, 9, 10 },

Look that:

[img width=335 height=500]https://raw.githubusercontent.com/tttapa/MIDI_controller/master/doc/Images/Button-matrix.png[/img]
2

If you want to handle several buttons pressed at once, yes you need it. If only one or two, they
are optional.

3

MarkT:
If you want to handle several buttons pressed at once, yes you need it. If only one or two, they
are optional.

thank you for answer.

4

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