Inexpensive Personal Response System. a. c. d. a. c. d. a. a. 30-35 units operating at same time in same room. The goal will be to take inexpensive TV remotes and install a chip that will communicate to a reciever the console number and the response.. Infrared Reciever connects to computer via USB. Hopefully reciever will not require batteries.. Would it be cheaper to build such a device from scratch or would it be be easier to modify an existing . '. remote controller. '. to perform this task or should I focus on the software and find the cheapest infrared devices I can find that offer a simple keyboard.. There are companies that sell . '. clickers. '. i.e. infrared controllers, for 75$ a piece. I want to know if I can use off the shelf devices with or without mods with my infra red ready PC. I know I. '. d need special software to handle the infra red signals... something that would help me differentiate one infra red controller from another.. My brother, experienced, advised: . ". Each transmitter would need a coded ship, like a mac address to be able to differentiate between responders. Very expensive unless you order 5000 or so.. ". Are there ways to write a new address to a chip cheaply?.