Hi, Platform: ubuntu-core-12.04.4-core-armhf, board UDOO duo. I am strugling for a day or so to read the temperature humidity sensor SEN-10167 using bcm2835 and Adafruit taken from RPI. Also I tried the sample rht03 from wiringPI. SO far looks like none of the libraries above can conrol any of the GPIO's, though catting echoing in /sys/.../gpio137/<> works. I tried also mimic the SEN-10167 protocol, in a C program reading /sys/ files back and forward, but... dealing with files io seems to slow to process the serial 1 bit protocol. Looks like a fopen/fread/fclose takes much more Total time elapsed : 214 us Total time elapsed : 203 us than 28 us for reading a bit and does not catch the timeframe to detect 1-ns and 0-es. Keeping the FILE* open then reading fails in all subseqent reads, returning noting, so I have to open-read-close. Any ideas how the above libraries don't conplain with bcm controller on UDOO, or to performe a read from gpio file under 4 uSeconds ?. Any other work arounds, or drivers to access the GPIO as on RPI. The bcm lib along with and Adafruit works simless on RPI. I have to do this from Linux not from ardu schetch Thank you.