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Raspberry Pi Pico DIY Workshop

You're reading from   Raspberry Pi Pico DIY Workshop Build exciting projects in home automation, personal health, gardening, and citizen science

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Product type Paperback
Published in May 2022
Publisher Packt
ISBN-13 9781801814812
Length 376 pages
Edition 1st Edition
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Authors (2):
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Sai Yamanoor Sai Yamanoor
Author Profile Icon Sai Yamanoor
Sai Yamanoor
Srihari Yamanoor Srihari Yamanoor
Author Profile Icon Srihari Yamanoor
Srihari Yamanoor
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Table of Contents (17) Chapters Close

Preface 1. Section 1: An Introduction to the Pico
2. Chapter 1: Getting Started with the Raspberry Pi Pico FREE CHAPTER 3. Chapter 2: Serial Interfaces and Applications 4. Chapter 3: Home Automation Projects 5. Chapter 4: Fun with Gardening! 6. Section 2: Learning by Making
7. Chapter 5: Building a Weather Station 8. Chapter 6: Designing a Giant Seven-Segment Display 9. Chapter 7: Designing a Visual Aid for Tracking Air Quality 10. Section 3: Advanced Topics
11. Chapter 8: Building Wireless Nodes 12. Chapter 9: Let's Build a Robot! 13. Chapter 10: Designing TinyML Applications 14. Chapter 11: Let's Build a Product! 15. Chapter 12: Best Practices for Working with the Pico 16. Other Books You May Enjoy

Interfacing sensors using the I2C interface

In this section, we will make use of the I2C (pronounced I-squared-C) interface to read temperature and humidity from the HTU21D sensor. We will read the temperature and display it on an OLED display.

Introduction to the I2C interface

In the previous section, we discussed the UART interface, which is asynchronous; that is, there is no reference clock signal. Now, we are going to discuss the I2C interface, which is synchronous and typically consists of a clock pin (for the reference clock signal) and a data pin. The following figure shows a schematic representation of devices on an I2C bus where we have a host device, which is usually a microcontroller such as the RP2040, and the sensors interface using the clock and data lines. Each sensor on the bus has a unique address that enables the host to communicate with the devices present on the bus. The following figure shows the host and peripheral devices on an I2C bus.

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