Roger,

That was extremely cool of you to post the schematic and especially the board.

Everyone else: I'm going to be attaching a Sensirion SHT-15 digital temperature/humidity interface to my Gumstix shortly. No ADC required. Calibrated. Simple I2C-like interface. If you can bit-bang these with a BASICStamp, then using a userland GPIO program on Gumstix ain't gonna be a problem.

I'm also, still, going to try and get a decent 1-Wire driver going for Gumstix as I need a huge amount of 1-Wire work a few years back (I have designs for things such as airflow/thermal sensors built on 1-Wire parts -- your Gumstix could tell you if the computer room AC fails!).

-marc

On 11/14/06, Roger Venable <roger38@mdve.net> wrote:
Hi Daniel

There's probably other robotics sites that have ways to do this.  I've
been looking at the I2C bus for sensor and control.

Check out the SparkFun.com site, they have a few I2C access sensors.  I've
been playing with daughterboard designs using Eagle schematic and PCB
layout software using some of the chips there.  I'm getting back a proto
board this Friday with an accelerometer, real time clock, compass, and LED
controller, all I2C based.   If you're interested in designing a board for
your project I can help, and I could probably use help writing drivers for
them.  Temperature should be easy, smoke I don't know and humidity sounds
familiar.  http://www.sparkfun.com  Get a load of the battery stuff too,
very cool.

Here, I've attached Eagle schematic and PCB files I did for practice at
3AM this last Saturday.  (NO Warranty. This circuit needs and does not
work. Do not make this, your money will be gone. All applicable
disclaimers are hereby yelled by lawyers in army tanks. Et cetera ad
nauseum.)  Actually I think it will work but I haven't checked the
voltages, or the part spacing to see how it lines up with the motherboard,
and the sexy Honeywell compass chip is pricey, so, like, yeah, I warned
ya.  I think I'm getting better at board design, so you real EE's flame
away on what I messed up.

> I'm looking into purchasing gumstix with sensors on an academic project.
Ideally we would like to connect the sensors to the gumstix, then have
the
> gumstix use an existing WLAN to transmit data back for data collection.
>
> Does anyone have any recommendations on vendors that make sensors
(smoke,
> temperature, humidity etc.) that are compatible with gumstix?  Are there
any common mistakes that I can avoid when using gumstix with sensors?
>
> Thanks,
> Daniel
>
>
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