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Developing IoT Projects with ESP32

You're reading from   Developing IoT Projects with ESP32 Unlock the full Potential of ESP32 in IoT development to create production-grade smart devices

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Product type Paperback
Published in Nov 2023
Publisher Packt
ISBN-13 9781803237688
Length 578 pages
Edition 2nd Edition
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Author (1):
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Vedat Ozan Oner Vedat Ozan Oner
Author Profile Icon Vedat Ozan Oner
Vedat Ozan Oner
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Table of Contents (15) Chapters Close

Preface 1. Introduction to IoT development and the ESP32 platform 2. Understanding the Development Tools FREE CHAPTER 3. Using ESP32 Peripherals 4. Employing Third-Party Libraries in ESP32 Projects 5. Project – Audio Player 6. Using Wi-Fi Communication for Connectivity 7. ESP32 Security Features for Production-Grade Devices 8. Connecting to Cloud Platforms and Using Services 9. Project – Smart Home 10. Machine Learning with ESP32 11. Developing on Edge Impulse 12. Project – Baby Monitor 13. Other Books You May Enjoy
14. Index

Integrating with SD cards over Serial Peripheral Interface (SPI)

Serial Peripheral Interface (SPI) is another serial communication protocol that can be used with devices. The main difference is that SPI requires at least four signal lines and one more each time when adding a new device to the bus.

Figure 3.6: SPI architecture

In this figure, the master node provides a clock over the CLK line,uses the Master-Out-Slave-In (MOSI) line to send data, and receives data over the Master-In-Slave-Out (MISO) line. It can communicate with a single slave node at a time. To select a slave node, it pulls the corresponding Chip-Select (CS) line to low.

Although SPI consumes more pin resources on an MCU, it achieves a higher data transfer rate compared to I2C. Therefore, in some applications, such as where SD-card integration is needed, it makes sense to prefer the SPI protocol over I2C.

In the next example, we will add SD card storage to our ESP32-C3-DevKitM-1 development kit...

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