Button matrix diode placement

[kolga]

Hi,

 

I am building a button box with a teensy ++ and mmjoy2 and have some wire and diodes on the way but i'm wondering the correct placement for diodes, i am seeing conflicting diagrams as far as where to put them. Is the picture on the mmjoy wiki correct?

 

Thanks!

[Sokol1_br]

Diode strip toward Row.

[Looney]

You mean this page: https://github.com/MMjoy/mmjoy_en/wiki/Connecting-basic-inputs-and-setting-up-software

 

?

 

If so than yes, the white stripe on the diode is on the side that has a lower potential as opposed to the other side, leading to current to flow through the body, to the stripe and out of the diode so to speak.

 

Why the diodes are there is to disable a current flow from a switch to another switch so current can only slow towards the microcontroller and not interfere with other parts connected.

[kolga]

Thanks so much guys! Yes that is the page.

 

 

P.S.

I am using an old housing from a truck radio and couldn't help but think of you Sokol when i looked on the side and saw "Made in Brazil" :)