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NEW PRODUCTS – Adafruit Real Time Clock Assembled Breakout Boards

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NEW PRODUCTS – Adafruit Real Time Clock Assembled Breakout Boards: PCF8523 / DS1307


These are great battery-backed real time clock (RTC) that allow your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. The DS1307 is the most popular RTC – but it requires 5V power to work (although we’ve used it with 5V power and 3.3V logic successfully). The PCF8523 RTC can run from 3.3V or 5V power & logic!

Works great with an Arduino using our RTC library or with a Raspberry Pi (or similar single board linux computer).

  • PCB & header are included
  • Plugs into any breadboard, or you can use wires
  • Two mounting holes
  • Will keep time for 5 years or more

3296 kit ORIG

3295 kit ORIG

Note: These products do not come with a CR1220 coin cell battery. We recommend you purchase a coin cell battery to use with these products.

The PCF8523 and DS1307 are simple and inexpensive but not high precision devices. They may lose or gain up to 2 seconds a day. For a high-precision, temperature compensated alternative, please check out the DS3231 precision RTC.

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In stock and shipping now: PCF8523 / DS1307


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