The DS3231-SN is a very useful and precise Real Time Clock (RTC). It comes in handy for all your projects in need of accurate timekeeping. Learn how to use the DS3231 on your Arduino (or any other microcontroller) without the use of extra RTC libraries! This way you can customize as you like and save precious memory on your microcontroller to do other tasks! A visual representation of the registers with LED's makes it easy to understand how the IC works and how to use it properly. We look at how to use Bitwise OR operation, Two’s compliment, and much more. I hope you enjoy the video! 00:00 - Intro DS3231 02:13 - Temperature-controlled RTC (TCXO) 02:56 - General info 03:46 - What to buy? 04:07 - SN vs M version 05:07 - Rechargeable battery on breakout board 06:05 - Pinout on the DS3231SN 09:00 - Connect to Arduino 09:35 - Coding 10:15 - Time/Date registers setup 12:55 - Binary Coded Decimal (BCD) 15:54 - Bitwise OR in Hours register 19:45 - ALARM 23:01 - Extra Settings 25:09 - Two's Compliment 29:05 - Extra info/tips GitHub code: