I've note this ... randomly start to work again ... but I didn't know why ... I've tried in different way ... so the message start from the trasmitter but seems doesn't arrive to the receiver ... Maybe I've miss something but is strange ...
From the hardware stand point the 2 arduino are connected
transmitt receiver
pin 12 --> pin 11
pin 11 --> pin 12
gnd --> gnd
Vin --> +5V
usb cable to the computer
Andrea