The binary counter IC is a 7-stage ripple counter, with each stage generating a binary digit.
Once you understand how to count in binary, you can see that each digit is created as a square wave signal. In the end, the ripple counter IC outputs a signal that randomly flashes the 7 LEDs ending in a die roll of a typically 6-sided die.
Bill of Material:
Hobby Project Kit, Electronic Dice, Single, Simulated Random Dice Roll