temperature and humidity data logger

Benjamin Deering ben_deering at swissmail.org
Sat Nov 19 12:35:30 CET 2011

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

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 at lists.openmoko.org
> http://lists.openmoko.org/mailman/listinfo/community

More information about the community mailing list