IR Transmitter

RAY MULKEY

I need a simple IR transmitter capable of sending two different IR Codes to a DVR. Each code would be sent when a corresponding input is pulled low. Can anyone help?

Mike Green

Have a look at "IR Remote for the BoeBot" here: www.parallax.com/detail.asp?product_id=28139.

This tutorial goes into detail about how IR remote control works and goes through a variety of examples using a Stamp.

The basic tutorial "What's a microcontroller?" discusses basic concepts like sensing switch closures, etc. here: www.parallax.com/detail.asp?product_id=28152.

stephenwagner

Ray,

This may also help.

Parallax, Resources, Customer Applications, IR Repeater.

http://www.parallax.com/html_pages/resources/custapps/app_irrepeater.asp

As the application states, the code was created prior to fully understanding the protocols involved.

The appendix discription is correct for the Magnavox TV and the RCA TV/satellite receiver.

For the best results, you will need a stable 38KHz/40KHz oscillator. The 555 arrangement has stability issues if you hant to communicate over a long distance. It is fine for the applications described by Parallax. I purchased the oscillator from http://www.rentron.com/PicBasic/RemoteControl.htm·and http://www.rentron.com/remote_control/TX-IR.htm·and http://www.rentron.com/Files/TX-IR.pdf.

I used the IR BOE BOT paper DEBUG and PULSIN 0 and then·1 to build a receiver to tertermine the on off times of the first few bursts and then then RCTIME to count the number of bursts/cycles.



Stephen

RAY MULKEY

Thanks for your help. Ray