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BeagleBone: Creative Projects for Hobbyists by Richard Grimmett, Rodolfo Giometti, Charles Hamilton

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Controlling external LEDs

In the last chapter, we looked at a quick blink recipe on how to control our on board LEDs. Now, the objective is to have an external LED on a breadboard blink. First, we will take a look at the circuit symbol of a basic LED so that we can recognize its proper usage, as shown in the following diagram:

Controlling external LEDs

The typical symbol for a light-emitting diode (LED)

In the following image, you will see what a real-life LED actually looks like. Not so straightforward as looking at the symbol, right?

Controlling external LEDs

Note

With LEDs, polarity matters to have ...

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