<a href="http://www.esacademy.com/en/library/technical-articles-and-documents/miscellaneous/i2c-bus/frequently-asked-questions/i2c-faq.html">http://www.esacademy.com/en/library/technical-articles-and-documents/miscellaneous/i2c-bus/frequently-asked-questions/i2c-faq.html</a> says 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.<br>
<br><div class="gmail_quote">On Sat, Nov 19, 2011 at 9:35 PM, Benjamin Deering <span dir="ltr"><<a href="mailto:ben_deering@swissmail.org">ben_deering@swissmail.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
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: <a href="http://www.sparkfun.com/products/9418" target="_blank">http://www.sparkfun.com/<u></u>products/9418</a><br>
<br>
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.<br>
<br>
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.<div class="HOEnZb"><div class="h5"><br>
<br>
<br>
<br>
On 11/19/2011 01:54 AM, Hans Zimmerman wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hey all,<br>
<br>
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?<br>
What kind of devices would be connectible (usb, bluetooth, other) to do that?<br>
<br>
Hans<br>
<br>
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