Connect the alarm pin (named SQW) of the DS3231 module to a pin on the Arduino that can be used for interrupts. Set an alarm on the DS3231 clock. Enable the Arduino's main loop to ignore the clock ...

Connect the SDA pin on the RTC module to Pin 25 (A4/D18) on the Arduino Uno/Nano. Connect the SCL pin on the RTC module to Pin 24 (A5/D19) on the Arduino Uno/Nano. The connection detail is shown below ...

Digital pin-3,4 acts as alarm pin from the first arduino, The A3 pin on the 2nd arduino reads this status to process inside the 2nd arduino. TFT ILI9163 is connected on the 2nd arduino to display time ...

The most popular RTC for the Arduino is the DS1307. However, it does have some drawbacks, the most notable of which is that its operating voltage is 5v, which means it cannot be used with 3.3v ...

Posted in Arduino Hacks, clock hacks Tagged 1307 RTC, arduino nano, Berlin clock, blinkenlights, clock, set theory, set theory clock, shift registers Coin-Op Weather July 8, 2015 by Dan Maloney 1 ...