Circular LED Chaser using 555 timer & CD4017

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A circular LED chaser is a simple electronic sequencer usually designed by combining a clock-generating device with a counter. the input clock can be of any type such as an astable multivibrator, an inverter, logic gates, a pushbutton, or a dedicated timer IC. The counter can be any of several types including 4-bit, 8-bit, decade, or shift registers, depending on the number of outputs and other features. So, In this project, we are going to build a simple Circular LED chaser circuit using a CD4017 Decade counter IC.

CD4017 IC is a 16-pin CMOS decade counter/Divider with 10 outputs. It is also known as the ‘Johnson 10 stage decade counter’. It has 10 decoded outputs that give output signals one by one in sequence when a clock signal from the clock input is given.

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5$ PCB Prototype

https://youtu.be/YjFJODsS6qI

Hardware Components

The following components are required to make Circular LED Chaser Circuit

S. no	Component	Value	Qty
1.	Decade Counter IC	CD4017	1
2.	LEDs	–	11
3.	IC	NE555 Timer	1
4.	Potentiometer	10K	1
5.	DC power jack	3.5mm	1
6.	Capacitors	1µF, 0.01µF	1
7.	Resistors	10K, 680	1, 2
8.	Battery	9V	1
9.	Battery clips	–	1
10.	Breadboard	–	1
11.	Connecting Wires	–	1

555 IC Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of NE555

CD4017 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of CD4017

Circular LED Chaser Circuit

Steps

Working Explanation

A NE555 timer is connected to the clock input of the CD4017 decade counter IC. The timer IC provides the CLK input of the decade counter with square wave input. CD4017 has 10 output pins and each pin joins to an LED. By default, the first output pin is on or high and the rest are off.

Each time the clock input pin of 4017 IC detects a rise in voltage (from low to high), it turns off the current output and turns on the next sequential output. This swapping of outputs which looks like the LEDs are chasing each other, continues until the last LED and then the output resets back to the first LED.

Applications

Widely used in places such as advertising displays and in running-light ‘rope’ displays in small discos, etc.
Useful in various projects such as Light Chaser, Remote controlled Switch, Alarm, Touch ON-OFF switch, Clap switch, Matrix Die.