now it Looks better :-) reversed D2 and D6 D2 -> Input 10K resistor-> Output 10K Input Fork and A1-> Output fork -> D6 The values now makes sense :-) However...Would be great if someone can have a look on the Sketch because Ihave removed the OTA part and not sure If it was correct on this way. Many thanks Markus

@Teknor try clearing the EEprom from the problematic nodes.

@sundberg84 Thanks for your response. I am using an Arduino Nano connected to a RPI II (serial gateway). Using the sketch and have followed the guidelines in the build section here. No modifications in the serial sketch settings or configuration - using standard setup. I have a few other nodes up and running (light sensors, temp and humidity sensors) working perfectly.