Pages: [1]   Go Down
Author Topic: i2c external A/D converter instead of Arduino analog inputs?  (Read 1079 times)
0 Members and 1 Guest are viewing this topic.
Palermo
Offline Offline
Full Member
***
Karma: 0
Posts: 174
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I am having a hard time with Arduino's analogRead() on multiple pins at once. I am having cross intereference, so I'm considering a change in attacking the problem.

What about using an i2c a/d converter and let Arduino read the data over a 2 wire connection? I'll save some pins (I am going to read several analog signals anyway, my Uno does not provide enough analog pins) and will hopefully get no cross interference, will I?

Does anybody have any suggestions about a cheap and easy to purchase i2c a/d converter? I'm not looking for 16bit resolution, a 12bit res will be enough (in some cases even 6bits will suffice).
Logged

Global Moderator
Netherlands
Offline Offline
Shannon Member
*****
Karma: 216
Posts: 13663
In theory there is no difference between theory and practice, however in practice there are many...
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Something like - http://www.gravitech.us/i2c128anco.html - (12 bit)  or -  http://ics.nxp.com/products/adcs/ - (8 bit) ?

not used myself disclaimer applies but it sounds like something useful. However it does multiplexing too..

Quote
cheap and easy
define cheap & easy smiley-wink

Logged

Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

Palermo
Offline Offline
Full Member
***
Karma: 0
Posts: 174
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

define cheap & easy smiley-wink

That's cheap and easy to purchase: http://www.ebay.it/itm/ART-New-PCF8591P-DIP16-PHILIPS-PCF8591-/320850300752?pt=LH_DefaultDomain_212&hash=item4ab42b0f50
Counterfeit? Don't know ...  smiley-confuse

And it's even easy to integrate on a toner-transfered self made pcb since there's a DIP package too.

This: http://www.gravitech.us/i2c128anco.html ... I'd avoid that if I can; I'd prefer a DIP version.

I know I will have to pay something more for a 12bit res version of course.
Logged

Pages: [1]   Go Up
Jump to: