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Made in reply for hackn101.
To make this as simple as possible I used a single AND gate to check the current count of the first counter(this counter is checking for the hex value of A). Once the gate returns true it resets the first counter and increments the second counter.
Remember these counter count up to 0-F(in the decimal system F is equal to 15). This number system is called Hexadecimal.
There are 4 main number systems used in electronics. Listed here.
Binary - (Base 2 : 0,1)
Octal - (Base 8 : 0,1,2,3,4,5,6,7)
Decimal - (Base 10 : 0-10)
Hexadecimal - (Base 16 : 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,D)
These are the most used, that I can currently recall. There are others I'm sure but these are the most common.
NOTES: I've done my best to explain this the best way I possibly could if any one had any additional comments or corrections please leave a comment. Thanks!
EDIT: Updated the counter to reset once the maximum value was reached.
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