Introduction

The RTC module is specifically designed for Raspberry Pi. It communicated with Raspberry Pi through I2C bus. There is a Maxim DS1307 and CR1220 button cell on the board to keep the real time for a long time after the Raspberry Pi has it's powerdown. Set a serial port, TTL convenient way online debugging.

Specification

• RTC module: DS1307
• Battery model: CR1220 button cell
• Opearting Voltage: 5V
• I2C address: 0x68
• Clock precision: ±2ppm (0~40°C)
• Unit information: Second, Minute, Date, Week, Month and Year
• Two calendar clock
• Operating temperature: -10°C至+85°C
• Compatible with Raspberry Pi B/A+/B+/2B
• Interface: 2*5p 2.54mm

Dimension

HOW TO USE

Connection

• Connect the module to your Pi

• The module leads to the TX&RX pins, you could set the information via this port.

Test

• 1. Input "sudo raspi-config" to Open Raspberry Pi I2C interface

• 2. Select "Advanced Options"

• 3. Select "I2C"

• 4. Select "YES"

• 5. Input "sudo vim.tiny /etc/modules" to add the module

• 6. Add "i2c-dev" device

• 7. Install I2C tools, input "sudo apt-get install i2c-tools"

• 8. Input "sudo reboot" to reboot Raspberry Pi; Input "sudo i2cdetect-y1" after a reboot. If everything goes well, the module will be detected normally.

• 9. Input "sudo su--" to get "root"; input "modprobe i2c-dev" to load I2C device.

• 10. Input "echo "ds1307 0x68" >/sys/class/i2c-adapter/i2c-1/new_device" to load to Raspberry Pi system I2C device.

• 11. Now you can use "hwclock" command to use this module, refer to "man hwclock" for more details.

"hwclock -r" Get RTC module time
"hwclock -w" Set system time

More Documentation

• Data sheet & Schematics