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That is an easy one.
Diodes are needed to isolate two or more keys down at the same time.
With diodes you can still tell what key is down, even if more that one.
Ray


On Thu, 13 Mar 2008 14:43:54 -0700, Andre Abelian wrote:
>=A0Hi to all,
>
>=A0I put together prototype project using keypad with individual
>=A0diodes added to each key and wrote the code every things working
>=A0fine now other group took my project and took all diodes off
>=A0"bypassed" and same project is working fine too I do not see any
>=A0problem. My question is what's the real reason to use diodes with
>=A0keypad?
>
>=A0thanks
>
>=A0Andre





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