Our project is work like this:
We are going to implement 3 units (3 is prototype, but it require 100,000+ eventually). Each unit has at least 3 RGB LEDs. The unit can be controlled by a PC base station. The PC is going to pass the message (turn on/off LED and LED color) to at least one of the units. Then the unit can pass the message to another unit.
We plan to use USB2 for PC. However, we were not sure the components require for the units. The base idea is to have (MCU+tranceiver+battery board) for every unit. Is there any off-the-shell solution for the unit?