Hi Andre,

If you push multiple buttons it can cause two or more outputs to short
together.

Cheerful regards,

Bob

On Thu, 13 Mar 2008 14:43:54 -0700, "Andre Abelian"
<aabelian@mason-electric.com> said:
> I put together prototype project using keypad with
> individual diodes added to each key and wrote the code
> every things working fine now other group took my project
> and took all diodes off "bypassed" and same project is 
> working fine too I do not see any problem. My question is
> what's the real reason to use diodes with keypad? 

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