29 Nov 0 ShareShare onLikeTweet Arduino Tutorial – Turn on / off anything at a specific time. (Trigger a Relay with DS3231 RTC) In Arduino, Atal Tinkering Labs ATL, More Info In this tutorial we will learn how to turn on / off anything at a specific time. For this we will use DS3231 RTC module and Relay module. Like time switch. Trigger a Relay with DS3231 Real Time Clock.