LED Chaser Circuit (555 Timer + CD4017) – KiCad Project

A classic LED chaser circuit designed using KiCad, powered by a 555 timer and CD4017 decade counter IC. It lights up a series of LEDs one-by-one in sequence, creating a "running light" or "Knight Rider" effect.

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🎯 What This Project Does

• Generates a continuous sequence of LED flashes (like chasing lights)
• Uses simple and easily available ICs: 555 Timer & CD4017
• Adjustable speed using a timing resistor/capacitor combo
• Designed as a KiCad project with proper PCB layout and schematic
• Great for learning KiCad, PCB design, or digital electronics

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📦 Features

• 10 output LEDs (can be reduced as needed)
• 555 Timer in astable mode for clock generation
• CD4017 Decade Counter to handle sequencing
• Clean PCB layout with labeled connectors and components
• Optional trimmer resistor to control LED chasing speed

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🧰 Components Used

Component	Quantity
555 Timer IC	1
CD4017 IC	1
LEDs	10
1kΩ Resistors	10
10kΩ potentiometer	1
100nF Capacitor	1
10µF Capacitor	1
Power Source (5V–9V)	1

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🚀 How to Use

1. Open the project in KiCad 7.x or newer.
2. View/edit the schematic in the .kicad_sch file.
3. Open the .kicad_pcb file to view or modify the PCB layout.
4. Export Gerber files if you want to fabricate the board.
5. Assemble the board using through-hole components.
6. Power it up and enjoy the chasing LED effect!

🔧 Tuning the Speed

You can control how fast the LEDs chase using the 10k potentiometer connected to the 555 timer. The values used are:

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💡 Educational Value

This is a beginner-friendly project that introduces:

• Basic timer circuits
• Counter IC operation
• Sequential logic
• KiCad schematic and PCB design

Perfect for hobbyists, students, or anyone getting started with PCB design!

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Credits

Circuit concept inspired by the classic LED chaser project found in many electronics books. This version was fully re-created in KiCad by Shiva Projects for educational use.

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📄 License

Open-source hardware. You are free to modify, improve, or manufacture the board for personal or educational use.