7 Segment Display Clock with DS1307
Arduino UNO (Kuman UNO)
Électronique / Electronic
Connect the USB to Arduino and make sure that time on your computer is correct because the time on the computer will be set to the RTC.
Upload the code to Arduino.
Once the time has been set:
You can set the 9V battery to ON and disconnect USB From Arduino.
7 Segment Display Clock with DS1307 Code