I need some help with a project I am doing involving the DS1307 RTC. I am trying to make what is essentially a way to mins quickly check the time which involves nine LEDs slowly lighting up every 10 so that I can quickly check time but looking at it. :Here is a rough 3D model of the housing of the arduino So far I've tried TimeAlarms but I can't figure out how to do this. I have a Arduino Uno by the way.

Can someone possibly help?

  • 2
    start by learning how to light up the LEDs .... then learn how to use the DS1307 RTC .... tutorials can be found on the web
    – jsotola
    Commented May 23, 2018 at 3:51
  • please explain what slowly lighting up actually means
    – jsotola
    Commented May 23, 2018 at 3:52

1 Answer 1


Use the SQW pin on the DS3231 or DS1307 to create 1sec pulse, read it on your Arduino. There are very good libraries are available (like RTClib from adafruit).

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