Home \ Help \ Search \ Login RSS

Welcome, Guest. Please Login

This forum is now READ-ONLY! Please visit http://forum.wiring.co/ for the new forum.

Wiring ForumWiring HardwareTangible computing › using a digitiser to increase the number of analog

Page Index Toggle Pages: 1
using a digitiser to increase the number of analog (Read 3196 times)
02/28/07 at 22:13:21

bostjan   Offline
YaBB Newbies

Posts: 4
*
 
I have a question. I would like to connect 10 joystick potentiometers to one wiring board but the thing is wiring only has 8 analog inputs and i would need 20. i know there are A/D chips out there and im wondering if its possible to use any of them and if anyone has any suggestions on which one to use and how the interface between it and the board would work.

The only thing i did so far was a 'hello world' kinda project where i used optocouplers to make the board type in numbers in an old calculator and print ascii art with it:). So this is a bit over my head for now.

any help with this would be greatly appreciated
 
IP Logged
 
Reply #1 - 03/01/07 at 18:53:58

bostjan   Offline
YaBB Newbies

Posts: 4
*
 
well i looked into this a bit more and i can see why no one responded (its kinda complicated). so im just gonna ask if its even possible at all?

this is the spec sheet for the A/D converter (i would want to use two of the 11 input types)
http://focus.ti.com/lit/ds/symlink/tlc540.pdf

and this is the doc for the potentiometers
http://www.ctscorp.com/components/Datasheets/252.pdf

im getting the 10 kOhm ones.

if its possible ill prolly get someone more knowledgeable to help me out because this doesnt look like something i can do with trial and error Smiley.

 
IP Logged
 
Reply #2 - 03/01/07 at 19:42:42

barragan   Offline
YaBB Administrator

Posts: 939
*****
 
hi, I'll look the datasheet you sent and I'll get back to you, I think I have a small one at home, and you can use it with a breadboard. Also it might worth to check at www.analog.com AD7812 10-Bit, 8-Channel, 350 kSPS, Serial A/D Converter, I think this one is very good. http://www.analog.com/UploadedFiles/Data_Sheets/AD7811_7812.pdf
 
IP Logged
 
Page Index Toggle Pages: 1