Hi!

At this point the ec probe was in the 12.88 calibration solution  and the gave a 1,8v on the connector pins, but no ec. value on the serial monitor. 

(The red and black cut wires was earlier used for external power supply).

I am also able to print out the raw ec value,  I guess before calibration, and receives a uncalibrated EC value of 11,8 for the 12,88 solution.

What have I done wrong..? :-)

Thanks!