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IR REMOTE-CONTROLLED VIDEO MULTIPLEXER

by Peter Gibbs

Start ý The Objectives ý Circuit Operation ý Decoding the URIC ý Short Program ý The Multiplexer Design ý Software ý Sources and PDF

THE OBJECTIVES

The main design objectives were to provide remote control of a multi-channel video system that was low-cost, had minimum components, and was expandable.

To achieve these goals, I used a Radio Shack 3-in-1 universal infrared remote controller (UIRC), normally used to control a TV, VCR, or standard household cable receiver, eliminating the need to build a hand-held control unit.

To decode the infrared signals from the UIRC, I used a low-cost Basic Stamp I microcontroller from Parallax Inc. The Stamp would also be used to control the video multiplexer and provide minimum visual and audible indication of the systemýs status.

The Basic interpreter language and the small RAM (256 bytes) on the Stamp I provided a challenge to fit the application software into the available space, but unique statements in the Stampýs Basic language came to the rescue.

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