The line of LEDs takes the inverted signals from a CD4017 counter, so that each LED generates light when the related outputs go to a low level. It works in bidirectional sequence. A 555 timer chip, in astable multivibrator mode, generates the clock signal.
Projects from Make: Magazine
LED Shift Register
Blinking a line of six LEDs in bidirectional sequence.
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Steps
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Step #1:
- The CD4017 integrated circuit may be damaged by static electricity.
- Use an antistatic workbench.
- Be connected to ground while you work.