Hi Tony,

I liked the idea of using analog input.
if you use metal film resisters without LM317 and ziner
it should work ok .

open will be 5 Volts  0xFF


Andre


Tony Nixon wrote:

> Hi all,
>
> I just posted a simple circuit for reading a keypad with 1 PIC pin.
> Nothing too elaborate, but it will work with hobby projects etc.
>
> http://www.picnpoke.com/projects/keypad.html
>
> --
> Best regards
>
> Tony
>
> Multimedia 16F84 Beginners PIC Tools.
> ** NEW PicNPro Programmer and Port Interface **
>
> http://www.picnpoke.com
> Email picnpoke@cdi.com.au