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Internet of Things Programming Projects

You're reading from   Internet of Things Programming Projects Build exciting IoT projects using Raspberry Pi 5, Raspberry Pi Pico, and Python

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Product type Paperback
Published in Jun 2024
Publisher Packt
ISBN-13 9781835082959
Length 458 pages
Edition 2nd Edition
Languages
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Author (1):
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Colin Dow Colin Dow
Author Profile Icon Colin Dow
Colin Dow
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Table of Contents (21) Chapters Close

Preface 1. Part 1: Setting Up the Raspberry Pi for IoT Development FREE CHAPTER
2. Chapter 1: Understanding the Raspberry Pi 3. Chapter 2: Harnessing Web Services with the Raspberry Pi 4. Chapter 3: Building an IoT Weather Indicator 5. Chapter 4: Building an IoT Information Display 6. Part 2: Building an IoT Home Security Dashboard
7. Chapter 5: Exploring the GPIO 8. Chapter 6: Building an IoT Alarm Module 9. Chapter 7: Building an IoT Button 10. Chapter 8: Creating an IoT Alarm Dashboard 11. Part 3: Creating a LoRa-Enabled IoT Monitoring Station
12. Chapter 9: Understanding LoRa 13. Chapter 10: Integrating LoRa with the Internet 14. Part 4: Building an IoT Robot Car
15. Chapter 11: Introducing ROS 16. Chapter 12: Creating an IoT Joystick 17. Chapter 13: Introducing Advanced Robotic Eyes for Security (A.R.E.S.) 18. Chapter 14: Adding Computer Vision to A.R.E.S. 19. Index 20. Other Books You May Enjoy

Exploring LEDs

LEDs were first developed in the early 1960s. The first LEDs were red and were first used as indicators in seven-segment displays. Today, LEDs are virtually everywhere – from indicator lights on our electronic devices and home appliances to the screens of our televisions and smartphones.

An LED is a simple semiconductor device. It has two leads – an anode (positive) and a cathode (negative). When a forward current passes through the diode from the anode to the cathode, it emits light. The color of the light depends on the materials that are used to make the diode and can range from infrared to ultraviolet, including all the colors of the visible spectrum.

LEDs come in various types, including single-color LEDs, RGB LEDs, which are capable of producing a multitude of colors, infrared LEDs, which are used in remote controls and night-vision systems, and bi-color LEDs, which can emit two different colors. Figure 3.6 shows an array of LEDs ranging from...

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