Real Time Clock (PCF8523) with Arduino Uno
For more details: http://bit.ly/2vur9Fc
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The PCF8523 RTC module from Adafruit is Real-Time Clock (RTC) and calendar optimized for low power consumption. Data is transferred serially via the I2C-bus. Alarm and timer functions are available with the possibility to generate a wake-up signal on an interrupt pin.
The PCF8523 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply. It can be used in many applications such as data logging, clock-building, time stamping, timers, calendars and alarms.
Features
Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
3.3 or 5 V power supply voltage
Low power consumption
I2C Serial Interface
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