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Internet of Things with Raspberry Pi 3

You're reading from   Internet of Things with Raspberry Pi 3 Leverage the power of Raspberry Pi 3 and JavaScript to build exciting IoT projects

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Product type Paperback
Published in Apr 2018
Publisher Packt
ISBN-13 9781788627405
Length 248 pages
Edition 1st Edition
Languages
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Author (1):
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Maneesh Rao Maneesh Rao
Author Profile Icon Maneesh Rao
Maneesh Rao
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Toc

Light-emitting diode

A Light-Emitting Diode (LED) is a particular type of diode that converts electrical energy into light energy. An LED emits visible light when an electric current passes through it. LEDs are very efficient in operation, consume less power, and have a very long life. They are generally used in applications such as indicator lights, LCDs, remote controls, and many such electronic devices.

The following figure shows an LED and an internal circuit as well:

Since an LED is a diode, it allows current to flow only in one direction and, if the opposite polarity is applied it won't break—it just won't work. The positive side is called the anode (+) and the negative side is called the cathode (-). The current always flows from positive to negative. In an LED, the anode side lead/leg is always longer and is a good way to identify the anode and cathode...

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