I am wanting to take two "arduino duemilanove" one being the Master and the other(s) being a slave and then use
either two cell phone audio jacks (Basicly I dial the other phone, a person answers and then plugs in his Arduino) to
connect for communication.
#1. Is this possible
#2. Has anyone done this, if so where can i start or get your code or direction on where to go next..
Thanks in advance.
Your project means modulating your data on an audio layer which is then digitized using lossy compression, transmitted and brought back to analog audio again.
The information in the Arduino can be represented by hexadecimal numbers. The DTMF (aka 'TouchTone) standard has 16 tone pairs which means that the information in his 'Master' Arduino can be converted, on a one-for-one basis, into DTMF tones which the phone or radio can easily transmit. The 'Slave' Arduino could then convert the received DTMF tones back into hexadecimal numbers.