Re: [Gumstix-users] Help with Overo ADCr

[jkoenig1987 <jon...@gm...>]

asoe wrote:
> 
> 
> Hi 
> 
> I am a newbie to Gumstix Tobe and Overo Tide. 
> I wonder where can I find the specification 
> such as A/D sampling rate for Tobi hardware. 
> I understand that Tobi comes with 6 A/D chs
> of 10 bits each as per Gumstix.com, but not
> finding anywhere about sample rate, etc..
> 
> 

We were using the Verdex Pro and GPSstix as a datalogger on a previous
project.  After some kernel configuration and python/c code, we were able to
get the ADC working.  As far as sampling rate, with nothing else running on
the processor, we were able to sample 1 channel in C at ~3.5kHz.  Here's a
summary of the sampling rates that we obtained with other channels.

2 channels: Python – 400 Hz, C – 1500 Hz
3 channels: Python – 320 Hz, C – 1040 Hz
4 channels: Python – 250 Hz, C – 750 Hz
8 channels: Python – 120 Hz, C – 400 Hz

Note that these values are from the Verdex Pro, whose ADC was on an
expansion board with the UCB1400.  Since the Overo has the ADC built in
(with a faster processor), I'd expect it to be faster.  Won't have actual
speed test results until we get there on our project though, probably a few
weeks from now...

Hope that helps,
-Jonathon
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