You could use a 12C671 PIC, which has an 8 bit A/D input.

--Lawrence

----- Original Message -----
From: "marco genovesi" <marco.genovesi@LIBERO.IT>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, February 21, 2002 9:36 AM
Subject: [EE]: A cheap A/D interface


> Hi all,
> I have to interface my 16F84 Datalogger ( 4.5V supply) with sensors that
> have a voltage output, but in my board I have only one free pin (RA4), so
> I'm thinking to a voltage-frequency converter. I need 8 bit resolution.
> For a lot of reasons, I would like a really cheap solution, preferably not
> over 2-3$.
> I have seen that a 4046 CMOS has a voltage-controlled oscillator, but I
> haven't never used it: can it be an acceptable solution for my specs or
I'm
> going in a wrong way? Have anyone any suggestion about 4046 VCO use or
other
> low cost alternatives?
> Thanks in advance
>
> Marco
>
> --
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> [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
>
>

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