Hi, this is my simple project with binary clock. There is used Arduino mega 2560 and RTC DS1302. Program work with Arduino UNO (Atmega328P) too - tested! But only need chagne the pin conection, for UNO : RTC is unchanged - myRTC(7, 6, 5); // CLK, DATA, RST Outputs column pins for LEDs - "LED 1"= pin 8; "LED 2"= pin 9; "LED 4"= pin 10; "LED 8"= pin 11; "LED 16"= pin 12; "LED 32"= pin 13; Outputs for rows is unchanged - 2 green seconds, 3 yellow minutes and 4 red hours. HEX file for MCUs and DS1302 is uploaded.

19.2.2019 - new firmware for UNO, added set up/down buttons on A0-A3 (connect AxGND)

I wish many fun! :-)

https://www.youtube.com/watch?v=kkWC_v7ntn4