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Arduino Internals by Dale Wheat

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Other Uses for a Blinking LED

LED lighting is one of the more fascinating applications of blinking LED technology. On a smaller scale, some other uses can prove handy, as well. One of them is using LEDs for communication.

Infrared Remote Control

It's quite possible that you've already used an LED to send a message today. Most consumer electronic devices that support a remote control use one or more variations of infrared (IR) remote-control protocols. These devices blink an infrared LED on and off quickly, using different timing patterns to convey different commands.

The typical IR remote control uses a 940nm IR LED. This wavelength is just past the red end of the spectrum that is visible to humans. You don't see any flashes of light coming from ...

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