As a project for a class of my master’s degree (I’m pursuing a master’s degree in IT), I want to show the data that is sent over the IR signal the remote control of my TV outputs (Daewoo CRT flat-screen TV). I basically want to explain how IR remote controls work and how the data is transmitted asynchronously. Actually, that’s the main point, to explain asyncronous communication and give an example of it.

I was given the option to use something like Matlab to perform a simulation, do the same in a custom app or use some hardware to present the project. I picked the last option because it was easier, more interesting and had everything I needed on hand.

To perform the project I’m using one of those IR sensors with integrated filtering (38 KHz band), I’m adding a regulated power supply and connecting one oscilloscope channel to the output of the sensor.

My TV is a Daewoo, so I searched a little and I was able to find the format of the data output by the remote.

I performed a little test by hooking everything together. Looked at a sample captured by my digital oscilloscope and it seemed to match with the described format, as expected.

I may also add something more to my little project. I’m planning to add a USB to TTL converter along with a PIC MCU (to modulate and the carrier wave) to send data (just like a remote control) by using a PC as a terminal. That will happen if I have enough time… I have to present it early in the morning on next Saturday.

Working with this simple “project” makes think about doing something related in the future

Tags: Electronics, Projects