LED Chaser Circuit using NE555 & CD4017

If you're interested in creating impressive light displays, the LED chaser circuit is an excellent project to start with. In this Blog Post, we'll walk you through the process of building a mesmerizing LED Chaser Circuit using NE555 & CD4017 IC

 Overview of CD4017 IC

The CD4017 is a built-in 10-stage counter and decoder. It has 10 output pins that are sequentially turned on and off based on the clock input signal. The CD4017 counts from 0 to 9 and then resets to 0. Each rising edge of the clock signal advances the counter by one step. CD4017 widely used in various digital and analog applications, including sequential logic circuits, LED chasers and more.

Pin Configuration of CD4017 IC

Pin 14-Clock Input - This is where the clock signal is applied. Each rising edge of the clock signal advances the counter.

Pin 15-Reset Input - When this pin is set to a logic low (0), it resets the counter to 0.
Pins-1,2,3,4,5,6,7,9,10,11 :Output Pins - These pins correspond to the 10 different counter stages. They are sequentially activated based on the clock input.
Pin 16-Positive Supply - Connect to the positive power of the supply voltage
Pin 8-Ground - Connect to the ground of the power supply.

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Overview of NE555 IC

The NE555 IC commonly used in various electronic circuits for generating timing signals, pulse generation, oscillation and more.

Pin Configuration of NE555 IC

Pin 1: Ground-

 Connect with ground of the power supply.
Pin 2: Trigger-

- Input pin in monostable mode for triggering the timer .
- Used for control the charging of the external timing capacitor in adjustable mode .
Pin 3: Output Pin-
- Produces a square wave output in adjustable mode.
- Produces timing pulse in monostable mode.
Pin 4: Reset-
- Connect to ground for reset the timer.
Pin 5: Control Voltage-
- Control the Threshold and Trigger Voltages.
Pin 6:Threshold-
- In monostable mode control The input timing
- In adjustable mode used for set the upper threshold voltage.
Pin 7:Discharge-
- In adjustable mode Connects to an external resistor for discharge timing capacitor .
- In monostable mode discharge the timing capacitor during the timing cycle .
Pin 8: VCC-
- Connect to the positive supply voltage.

 

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Operation of LED Chaser Circuit using NE555 & CD4017

⇒The NE555 is a versatile timer IC.In this LED chaser circuit,When power is turn on it will function as generating a continuous square wave at it's output Pin(Pin3).
⇒Square Wave, providing clock pulses to the CD4017.
⇒The CD4017 is a 10-stage counter/divider that produces sequential high outputs for each clock pulse.
⇒The outputs are used to drive the LEDs sequentially.The LEDs are  sequentially lighting up in a chasing pattern as the clock pulses continue.

Components Needed for LED Chaser Circuit using NE555 & CD4017

⇒CD4017 decade counter IC
⇒NE555 timer IC
⇒LEDs -10 pcs
⇒Electrolytic Capacitors-10μF/25v
⇒Ceramic Disk-0.1uf(104)
⇒Resistors -680Ω,10kΩ
⇒Preset-10kΩ

Complete Circuit Diagram of LED Chaser Circuit using NE555 & CD4017

 

This circuit diagram provides a detailed overview of the connections and components involved in making a LED Chaser Circuit using NE555 & CD4017

Explanation of the Circuit

⇒Timing components (Capacitors & Resistors) connected to the Threshold Pin(Pin6) and Discharge Pin (Pin 7) of NE555 IC that determine the the clock signal's frequency.Larger resistor values or capacitors will result in a slower chase, while smaller values will speed it up.

⇒Turning the potentiometer adjusts the resistance in the circuit, thereby changing the charging and discharging times of the capacitor in the NE555 timer.This allows control the frequency of the square wave generated by the NE555 and influencing the speed of the LED chasing effect. 

⇒Pin 3 of the NE555 is connected to Pin 14 (CLK) of the CD4017 for receiving clock the pulses.

⇒Pins Q0 to Q9 (Pins-1,2,3,4,5,6,7,9,10,11) of the CD4017 are connected to individual LEDs,forming the chasing sequence. 

 

⇒Ensure that polarity of each LED is correct,the longer lead (anode) connected to the CD4017 output pin and the shorter lead (cathode) connected to the current-limiting resistor through ground. 

 

⇒Power up the circuit by connecting the 5 to 9V DC supply.

 

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Step by step video tutorial of LED Chaser Circuit using NE555 & CD4017

 

Complete setup of LED Chaser Circuit using NE555 & CD4017 

By understanding the detailed connections and functions of each component, you can now build and customize your own LED Chaser Circuit using NE555 & CD4017.

 

Customize the project for High-Power LED

If you want to use high-power LEDs that use more current than the IC can provide, consider adding transistors to each output.This transistors allow the LEDs to be powered directly from the power supply,with the CD4017 controlling the transistors.

 

 Frequently Asked Questions

Why NE555 Timer IC is use in LED Chaser Circuit ?

In the LED Chaser Circuit, The NE555 functions is generating a continuous square wave that provides clock the pulses to CD4017 is a decade counter/divider IC.

Why CD4017 IC is use in LED Chaser Circuit ?

In the LED Chaser Circuit,CD4017 IC activates its output pins sequentially creating the chasing effect by counts the clock pulses received from the NE555.

How does the LED Chaser Circuit work?

The NE555 generates a square wave, and the CD4017 divides the frequency, sequentially activating its output pins. Each output pin is connected to an LED, and the LEDs light up in sequence, creating the chasing pattern.

How does the LED Chaser Circuit work?

The NE555 generates a square wave, and the CD4017 divides the frequency, sequentially activating its output pins. Each output pin is connected to an LED, and the LEDs light up in sequence, creating the chasing pattern.

How to control the speed of the LED chasing effect?

By adding a potentiometer to the NE555, we can adjusting the resistance, control the speed of the LED chaser changing the frequency of the square wave that control the speed of the LED chaser.

How to use high-power LEDs in Chaser Circuit?

If using high-power LEDs, adding transistors (e.g.NPN transistors) to each output of the CD4017 to handle the higher current requirements.

 

 

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