This is a great battery-backed real time clock (RTC) that allows 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. Equipped with PCF8523 RTC - it can run from 3.3V or 5V power & logic!
Works great with an Arduino using this RTC library, with CircuitPython 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
Note: This product does not come with a CR1220 coin cell battery. We recommend you purchase a coin cell battery to use with this product.
The PCF8523 is simple and inexpensive but not a high precision device. It may lose or gain up to 2 seconds a day. For a high-precision, temperature compensated alternative, please check out the DS3231 precision RTC.
Check out this detailed guide for code, libraries, schematics, Fritzing object and more!
Technical Details
Check out this detailed guide for code, libraries, schematics, Fritzing object and more!
Revision History:
As of March 25, 2022, this board now may come with a PCB version that has HVSON or SOIC-8 chip package depending on what chip is available in the market. Both are identical functionality!
As of Aug 30, 2017 we have updated the design to have an RC filter on the power supply to reduce accidental resetting if power drops too fast!
Mounting holes are 2.2mm (0.086in) diameter, 25mm (0.98in) apart
This board/chip uses I2C 7-bit address 0x68
Product Dimensions: 25.5mm x 21.7mm x 4.8mm / 1.0" x 0.9" x 0.2"
Product Weight: 1.2g / 0.0oz
Learn
Adding a Real Time Clock to Raspberry Pi - Keep time at all times with a real time clock
I2C addresses! - I2C addresses from 0x00 to 0x7F (inclusive)
Adafruit PCF8523 Real Time Clock - Tick tock, got a clock?
MacroPad 2FA TOTP Authentication Friend - Easy keeb access to your TOTP keys.
