Arduino Cookbook > Communicating Using I2C and SPI > Interfacing to an External Real-Time Clock

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Arduino Cookbook

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Preface

Ch. 1. Getting Started

Ch. 2. Making the Sketch Do Your Bidding

Ch. 3. Using Mathematical Operators

Ch. 4. Serial Communications

Ch. 5. Simple Digital and Analog Input

Ch. 6. Getting Input from Sensors

Ch. 7. Visual Output

Ch. 8. Physical Output

Ch. 9. Audio Output

Ch. 10. Remotely Controlling External Devices

Ch. 11. Using Displays

Ch. 12. Using Time and Dates

Ch. 13. Communicating Using I2C and SPI

recipe 13.1. Introduction

recipe 13.2. Controlling an RGB LED Using the BlinkM Module

recipe 13.3. Using the Wii Nunchuck Accelerometer

recipe 13.4. Interfacing to an External Real-Time Clock

recipe 13.5. Adding External EEPROM Memory

recipe 13.6. Reading Temperature with a Digital Thermometer

recipe 13.7. Driving Four 7-Segment LEDs Using Only Two Wires

recipe 13.8. Integrating an I2C Port Expander

recipe 13.9. Driving Multidigit, 7-Segment Displays Using SPI

recipe 13.10. Communicating Between Two or More Arduino Boards

Ch. 14. Wireless Communication

Ch. 15. Ethernet and Networking

Ch. 16. Using, Modifying, and Creating Libraries

Ch. 17. Advanced Coding and Memory Handling

Ch. 18. Using the Controller Chip Hardware

Appx. A. Electronic Components

Appx. B. Using Schematic Diagrams and Data Sheets

Appx. C. Building and Connecting the Circuit

Appx. D. Tips on Troubleshooting Software Problems

Appx. E. Tips on Troubleshooting Hardware Problems

Appx. F. Digital and Analog Pins

Appx. G. ASCII and Extended Character Sets

Colophon

Index

recipe 13.4. Interfacing to an External Real-Time Clock

13.4.1. Problem

You want to use the time of day provided by an external real-time clock (RTC).

13.4.2. Solution

This solution uses the Wire library to access an RTC. It uses the same hardware as in Section 12.7. Figure 13-7 shows the connections:

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Contents

Chapter 13. Communicating Using I2C and ... > Interfacing to an External Real-Time...

recipe 13.4. Interfacing to an External Real-Time Clock

13.4.1. Problem

13.4.2. Solution