DFR0386

  Raspberry Pi RTC Module SKU: DFR0386 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. NOTE: DO NOT power it again if the Raspberry Pi has been powered, or it will damage the module and Raspberry. 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 https://www.dfrobot.com/wiki/index.php/Raspberry_Pi_RTC_Module_SKU:_DFR0386 6-7-17