[clug] Raspberry Pi WLAN issues

Stephen Gibson Stephen.Gibson at anu.edu.au
Tue May 27 18:24:07 MDT 2014

Not an IP camera, just the raspberry pi camera board (better than my 
Aldi Onix phone camera).
Yes, follow your ideas and use the Rpi. The sensors are cheap and 
trivial to monitor.

I purchased the 1-wire sensors from dealextreme (aud.dx.com):



These are plug and play(*) (no additional resistor requires = sort of 
cheating). Just connect to GPIO4 (and 5V, ground), load the modules 
w1-gpio  and w1-therm, and cat /sys/bus/w1/devices/28-xxxxxx/w1_slave
(where xxxxxxxx = your sensor). Use python code to read, average, and plot.

I am still waiting on the humidity sensor:




(*) I did manage to abuse this sensor, the 3 connections are not 
labelled and I missed the w1-therm module, and so tried reversing the 
power. This generated some heat. The sensor still operates, but appears 
to have lost its absolute calibration.

On 28/05/14 10:00, Jeff Stiff wrote:
> Following on.
> Actually I'd be really interested in more detail and results from both 
> your temp/humidity sensors and to some extent the ip camera.
> I've got a need to track temp/humidity in a small cabinet and trigger 
> heating/cooling based on set trigger values. Have been thinking of 
> maybe trying that out with the pi, or one of the kits from a past LCA.
> Cheers
> Jeff.

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