Adafruit PCF8523 Real Time Clock Assembled Breakout Board
Richard L'Abbé uOttawa Makerspace
$9.50
is on back order
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!