Subject:
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Re: Analog/Digital IO
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 3 Feb 2000 20:51:47 GMT
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Original-From:
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Jonathan Swaby <(jonathan.swaby@vpss.gatech.edu)ihatespam()>
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Viewed:
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1905 times
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Maxim sells a chip that I have connected to the parallel port on my PC and it seems to work well. I got the design from an article in Dr. Dobbs. The article was on using Linux to collect data. The author of the article has a book which has the circuit diagrams for the Maxim 186 and other ADC chips. The book also includes C source code. I compiled the source using djgpp. The book is Programming the Parallel Port; Interfacing the PC for Data Acquisition and Process Control
by Dhananjay V. Gadre
Also, check out http://www.controleverything.com . They sell some chips the connect to the serial port that do AtoD. I recently purchased their anabug chip that has 4 analog lnes and one digital line. I have not built the circuit yet, and they are no longer selling the chip, but they do sell others.
> On Thu, 3 Feb 2000, Mike Reiling wrote:
>
> > I know this question does not really relate to the handyboard, but does
> > anyone know of a cheap PCI or ISA card for a PC to read analog or
> > digital values?
>
> For digital values, you can use a parallel port card, or even
> handshake lines on a serial port.
>
> For analog, you can again use a parallel port, and hook up an external
> A/D chip. As long as you're not trying to get too many bits of
> resolution this method works well (like say 8-bits). There are a lot
> of chips out there that have many input pins for A/D. You select
> ahead of time which input you want to take a sample on.
>
> You might also try looking in Nuts and Volts magazine for cheap
> PCI/ISA cards. That's a reasonably good place to find such things.
>
> Curt Mills, WE7U hacker.NO_*SPAM@tc.fluke.com
> Senior Methods Engineer/SysAdmin
> "Lotto: A tax on people who are bad at math." -- unknown
> "Windows: Microsoft's tax on computer illiterates." -- WE7U
>
>
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