http://www.esacademy.com/en/library/technical-articles-and-documents/miscellaneous/i2c-bus/frequently-asked-questions/i2c-faq.htmlsays bus length can be 9-12 ft. I would suspect capacitance between the wires is the major problem so I would look at that as the primary length limiting factor.
On Sat, Nov 19, 2011 at 9:35 PM, Benjamin Deering <ben_deer...@swissmail.org > wrote: > > When I was looking for temperature sensors to provide input for my ski wax > program, I found an I2C temperature and humidity sensor. Sparkfun has it > on a breakout board: > http://www.sparkfun.com/**products/9418<http://www.sparkfun.com/products/9418> > > I did some experiments earlier with using the BMP085 barometer's internal > temperature sensor for temperature monitoring, but heat from the freerunner > was throwing off the readings. If you can locate the sensor where it won't > be affected by the internal heat of the freerunner, I2C is not a bad way to > go. The installation instructions for the freerunner-navigation-board show > where to find the I2C connectors in the phone. If you choose a sensor that > already has linux drivers, you will be able to read temperature from /sys > and your logger program shouldn't be too difficult. > > If you are planning to place the sensor away from the phone, I2C may not > work, I don't know the maximum wire length for that bus. > > > > > On 11/19/2011 01:54 AM, Hans Zimmerman wrote: > >> Hey all, >> >> I would like to start logging the temperature and humidity inside our >> house. Are there people with experience in using the freerunner as a >> temperature and humidity data logger? >> What kind of devices would be connectible (usb, bluetooth, other) to do >> that? >> >> Hans >> >> ______________________________**_________________ >> Openmoko community mailing list >> community@lists.openmoko.org >> http://lists.openmoko.org/**mailman/listinfo/community<http://lists.openmoko.org/mailman/listinfo/community> >> >> > > ______________________________**_________________ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/**mailman/listinfo/community<http://lists.openmoko.org/mailman/listinfo/community> >
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