CommentStreams:7f3d8f05f06118810b816e59e3517dfd

2nd board works flawless - first one didn't start up the Pi with jumpers on board and died in a little cloud of smoke after a few hours. 2nd one first tested without Pi as described works great and stable. Added a little alias at the end of bashrc :

sudo nano ~/.bashrc alias fan='sudo python /home/pi/x735-v2.5/read_fan_speed.py'

reboot

and now a simple "fan" displays the fan speed:

pi@RaspberryPi:~ $ fan 0 RPM 1781 RPM 1782 RPM