39 simple clock microcontroller n LED seven semen no componen 74xxx

unpacking PCB
https://www.youtube.com/embed/CLLF-XH58Hk

not yet build but i will ...


1. Board Arduino
2. RTC Ds3231
3. Led merah 2 biji
4. Resistor 220 ohm -1K
5. push button 2 buah


Reference n complete project downlod :

http://www.rokhmad.com/2017/07/simple-jam-4-digit-7-seven-segmen.html