Reposting my question to more relevant forum.
I am new to this community, adriuno as well as to the whole world electronics and very recently started learning ardiuno and electronics out of interest to developing some fun projects, I hope you wouldn't mind answering my silli questions, I am looking forward to your help.
I am looking to control multiple device (motors) with one master (ATmega328P) and multiple slave (Attiny85) by using serial communication, I do not want to get into too much of complexity but still want to stay with minimal components.
I am thinking of using using multiples Attiny85 as slaves (with Softwareserial library) which would receive a messages (e.g some id) , if this ID belongs to a particular slave, only that slave would react (in my project It would then pass high to a motor driver to drive a motor) i am looking to share the same mesage (id) to all Attiny85 connected with a single bus (like one to many broadcast message) and only one of them would recognise that message. (I am thinking to avoid using RS485 or adding multiples of MAX485 with each Attiny85 )
Do you think it is possible (without any voltage drop) to send the same serial messge to 20 Or more slaves with a 20 meter wire, or is there any better approach, IC or library.
Please also suggest if any other low cost microcontroller available which supports hardware Tx, Rx pins and also suggest if any cheap motor driver could be used which could be programmed or support RS485 communication.
Thanks in advance.