I am going to make an intercom design. It's my first time of doing something like this. The final system will always consist of only 2 terminals connected with a wire. There is a need of using as less as possible number of cables for the 2 terminals interconnection. The power supply has to be from 8 up to 30Vdc. Also, there is no need for the products to be compatible with any similar comercial product.
Is there any opinion or eperienced freak to help me make the begining ? Is there a need of a microcontroller that could make the system more robust (in noise) or even that could limit the number of cables or to reduce the final price ?
Any links, topics, ideas are wellcome.
Thank you in advance.