I have an idea about sending sound (through PWM) with this schema from 1 Arduino to another Arduino:
Arduino -> walkie talkie tx --------- air ------- Walkie talkie rx -> Arduino.
After reading http://www.arduino.cc/en/Tutorial/PlayMelody
, I think it is possible. What I actually want is sending data, not sound, from 1 room to another room. I know for most walkie-talkies (frs/gmrs) this is not allowed, but since the Walkie-talkies I will be using are really toys, I don't see much of a problem.
The first Arduino is offering sound (data through PWM) to the first Walkie talkie microphone. The 2nd Walkie-talkie receives sound and offers the sound to a 2nd Arduino, 2nd Arduino reads it through Analogread() and converts it back to data.
Any ideas if this is doable?