Digital Pots are cute, but be sure to notice that the current capabilities
of those pots is very small. Make sure that over the entire range of use
that the current is not exceeded. The other limit is the fact that they only
work within the GND-VCC range as it is connected.

Have been very happy with their except for these limitations.

This is my first posting to the PICLIST.

--Bob Axtell


----- Original Message -----
From: "Manu Nair" <mnair066@UOTTAWA.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, November 02, 2002 9:20 AM
Subject: Re: [PIC]: Controlling resistance


> You can control the resistance by using a digital pot. You just send the
> values of the resistance you want via SPI and then the digital pot will
> adjust to it. Microchip, among others, makes a variety of them. Their part
> number (Microchip's) starts with MCP41 /MCP42-then the value of the pot.
> Application note AN746 from Microchip's website shows you how to interface
a
> PIC16F876 to their digital pots. I am sure you can figure out how to port
it
> over to the 16F628. Hope this helps.
>
> AN746
> http://www.microchip.com/download/appnote/analog/mcp4xxxx/00746a.pdf
>
> \manu
> _______________________
> Manu Nair
> mnair@email.sae.org
>
>
>
>
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jai Dhar
> Sent: November 1, 2002 9:54 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: Controlling resistance
>
>
> Hello,
>
> I am looking to make a simple linear psu using lm317/337's adjustable
> regulators. Basically, they use a pot from 0 -> 5k to adjust the Vout. I
was
> wondering if there is a way I can control a resistance using a 16f628, so
I
> can incorporate a sort of digital feel to my psu. Thank you for your time,
>
> Jai
>
> ----------------------------------------
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