temperature and humidity data logger

[Dave]

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_deering at 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
>>
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>
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