Question

Design a circuit in which you have 14 LEDs lined up in a straight line. The LEDs should light up, one at a time, in order starting from left to right. When the light reaches the end (the 14th LED), they should reverse order and light up in order, one at a time, from right to left. When the light reaches the beginning (the 1st LED), the circuit should loop and and continue to light up from left to right and so on forever.

Answer 1

the circuit which can do this forever is a simple shift left and right register with automatic control.

the circuit is shown below:

the diagram shown is for 4 Led bt the concept is the same and can be repeated to make a 14 led system

the t flip flop is a counter in the above it counts for 0 to 3. the select toggle to left and right is taken from another flip

i,e if you want14 repitions u will have to get another flip flop which toggles every time 14 is reached in the counter.

that output is connected to select operation for left and right.

the shifting occurs.

the input at 1 should changes its value for 1 to zero since we just want a single led to be on at a time.

repeat the above to get the final circuit.