Recently I buyed a EfComv1.2 shield for arduino, I proved it in my arduino mega and my arduino UNO, I proved it in diferent pins and serial ports, always with the same result.
In the serial monitor the outputs are repeated every second or less.
I upload a video in youtube:
Anyone can guide me to what is the problem? I think it's not a connection problem, I followed some tutorials with no result. How I can fix it?
Thank you very much in advance,