Breakout Boards
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The Real-time clock & microSD breakout keeps accurate time and supports external memory through a microSD. The breakout features the DS1307 Real-time clock with battery holder for reliable time readings in case of breakout power outage. The RTC/SD Breakout also features a microSD card slot, adding external memory to read/write pictures, text files, audio and much more. Add accurate time measurement and external memory to your next Arduino project!


  • 100% Arduino Compatible
  • Operating voltage: 3.3V – 5V MAX
  • counts seconds, minutes, hours, date of the month, month, day of the week, and year with leap year compensation valid up to 2100
  • microSD card support
  • 5v to 3.3v regulator for SD card operation.
  • microSD SPI interface
  • DS1307 RTC I²C interface
  • CR1220 battery required (not included)


RTCSD Schematic
Osepp Real-time clock and microSD breakout code OSEPP zip files



Stock Code Product Name
RTCSD-01 Real-time clock and microSD breakout