“The IR Remote Wand is a universal remote control that you can program with up to five codes to control a variety of different products:
IR Remote Wand universal remote control based on an ATtiny85.
It supports some of the most popular IR remote control protocols: Philips RC-5, NEC, Samsung, and Sony. It’s based on an ATtiny85, and the circuit goes to sleep when you’re not using it, to avoid the need for an on-off switch and to prolong the battery life. You can use my earlier IR Remote Control Detective [Updated] to discover the codes for the functions you want to support.
Introduction
I need to use three different remote controls to operate my television, DVD player, and audio system. However, I typically only use one or two buttons on each remote control for the functions I need regularly. I therefore decided to design a smaller, more convenient, remote control that I could program with the essential functions from all the other remote controls.
Because I wanted relatively few functions I based the remote control on an ATtiny85; using one I/O line to drive the infrared LED left four I/O lines available for buttons, and the reset signal can be used as a fifth button. If you need more than five buttons you could make one button cycle between different options, or use one button to change modes.”