IoT & Hardware
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You're reading from  Mastering Internet of Things

Product typeBook
Published inMar 2018
PublisherPackt
ISBN-139781788397483
Edition1st Edition
Tools
Raspberry Pi
Concepts
IoT Development
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Author (1)
Peter Waher
Peter Waher
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Peter Waher

Peter Waher is the founder of Little Sister®, a standards-based distributed social network, based on the principles of edge computing, privacy & information ownership, for humans and machines. Currently, Peter advises companies on topics such as privacy, the IoT and Smart Cities. He has worked for 24 years with computers and device communication, including low-level development in assembler for resource-constrained devices to high-level system design and architecture. His award-winning applications has attracted global attention, and he has been invited to speak at prestigious events.
Read more about Peter Waher

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Connecting an LED

An alternative to working with the alternating current (AC) is to use a low-power direct current (DC) source and an LED to simulate a lamp. You can connect the COM connector to a resistor and an LED, and then to ground (GND) on one end, and the NO directly to the 5V or 3.3V source on the Raspberry Pi on the other end. The size of the resistor is determined by how much current the LED needs to light up, and the voltage source you choose. If the LED needs 20 mA, and you connect it to a 5V source, Ohms Law tells us we need an R = U/I = 5V/0.02A = 250 Ω resistor. The following figure illustrates this:

Connecting a LED

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Mastering Internet of Things
Published in: Mar 2018Publisher: PacktISBN-13: 9781788397483
© 2018 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Peter Waher

Peter Waher is the founder of Little Sister®, a standards-based distributed social network, based on the principles of edge computing, privacy & information ownership, for humans and machines. Currently, Peter advises companies on topics such as privacy, the IoT and Smart Cities. He has worked for 24 years with computers and device communication, including low-level development in assembler for resource-constrained devices to high-level system design and architecture. His award-winning applications has attracted global attention, and he has been invited to speak at prestigious events.
Read more about Peter Waher

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