Would you need a diode if you made the PIC pin an input when not in use?

Thanks

Scott


-----Original Message-----
From: Roman Black [mailto:fastvid@EZY.NET.AU]
Sent: Monday, September 16, 2002 9:45 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Infrared Communications -- (variable freq 555 osc)


Smith,Steven W wrote:
>
> Maybe you could use a digital potentiometer controlled by the PIC to set
> the frequency of the 555.  Digikey has about 500 different flavors.


The 555 uses resistors to +ve to give the charge
time, with one resistor to its open collector pin
to give discharge time. To control its freq with a
PIC (in one or two freq steps) only requires a resistor
and diode to the PIC pin which will change the charge
time and hence freq. :o)
-Roman

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