Is Serial debugging blocking my program?

Using Arduino Project Guidance
1

Hello,

I am close to going nuts! :0

I've spent hours trying to debug my wireless transmission and am close to giving up. It all was finally working with my Arduinos connected to my PC with Serial port, but when I took them mobile, they let me down.

Can it be that Serial.println() is blocking the execution if no data cable is connected?

When connected to the PC, the first arduino is reading the movements of the WiiNunchuck and outputting them to Serial. Then it transfers them with a nRF24L01+ module to the second arduino.
The second arduino (connected to the PC as well) receives them (received codes are put out to Serial for debugging) and sets some servos accordingly.

When I wire both Arduinos to battery packs, the servos stay dead. And of course I cannot see where the failure is. :frowning:

Can someone help to get my Arduino into the air?

Cheers,
Robert

2

start with showing how you have them wired and posting your code...

It's hard to see from here.

3

I am close to going nuts! smiley-mad

If you're here, your already there.... XD