I have recently purchased a roboaudiostix in place of my robostix because
the analog sensors I need to interact with run off of 3.3v and the robostix
only supplies 5v. I was planning on using the UCB1400 A/D but now that I
have received it I realize there are only four usable pins. The sensor
breakout boards I need to interact with have a total of eight pins I am
There are two breakout boards that take 3.3v each; is it possible to run the
sensors off of the 3.3v rails from the UCB1400 and run the data through the
ATMega128 A/D? What are my options?
From: Dave Hylands <dhylands@gm...> - 2006-11-17 01:22:10
> There are two breakout boards that take 3.3v each; is it possible to run the
> sensors off of the 3.3v rails from the UCB1400 and run the data through the
> ATMega128 A/D? What are my options?
Yeah, the ADCs on the robostix can take anything upto 5v. If you feed
in a signal which only goes up to 3.3v it just reduces the range of
So, lets assume you're using 10-bit ADC values. These would range
0-1023 with inputs 0v to 5v. 0v to 3.3v would give values in the range
0 to 675 (approx).
Vancouver, BC, Canada
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