In the DIY electronics world,creating light displays always has been a fascinating Project.One such project is the Both-Way LED Chaser Circuit using the popular NE555 timer IC and the CD4017 decade counter.
Both side LED chaser circuit based on the 4017 IC refers to a circuit that creates a chasing or sequencing effect where LEDs light up in a pattern on both sides, usually in an alternating fashion.
In this blog post, we'll providing a comprehensive guide about how to make Both Way Led Chaser Circuit using NE555 & CD4017 with a detailed circuit diagram.
Components Needed for Both Way Led Chaser Circuit using NE555 & CD4017
⇒CD4017 decade counter IC⇒NE555 timer IC
⇒LEDs (12 pcs)
⇒Diode-IN4007(10 Pcs)
⇒Electrolytic Capacitors-10μF/63v
⇒Ceramic Disk-0.1uf(104)
⇒Resistors -100Ω,10kΩ
⇒Variable Resistor-10kΩ
CD4017 IC Overview
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
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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NE555 IC Overview and Pin Configuration
The NE555 IC commonly used in various electronic circuits for generating timing signals, pulse generation, oscillation and more.In the Both-Way LED Chaser Circuit,NE555 is used for astable mode to generate a continuous square wave signal.
Connect with ground of the power supply.
Pin 2: Trigger-
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.
- 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.
Both Way Led Chaser Circuit using NE555 & CD4017
NE555 Connection:
➡Place a resistor(10K) between pins 7 of NE555 and the positive supply voltage.
➡Place a capacitor(0.1uf) between pins 5 of NE555 and the Ground.
➡Place a capacitor(10uf) between 2 and 6 of the NE555 and the Ground.
➡Connect a potentiometer with pins 2 and 6 of the NE555 IC.This allows control the frequency of the square wave generated by the NE555
➡Place a resistor(10K) between pins 7 of NE555 and the positive supply voltage.
➡Place a capacitor(0.1uf) between pins 5 of NE555 and the Ground.
➡Place a capacitor(10uf) between 2 and 6 of the NE555 and the Ground.
➡Connect a potentiometer with pins 2 and 6 of the NE555 IC.This allows control the frequency of the square wave generated by the NE555
CD4017 Connection:
➡Connect the Q0 to Q9(Pins-1,2,3,4,5,6,7,9,10,11) outputs of the CD4017 to individual LEDs.Place a Diode-IN4007 between each led's anode lead and CD4017's outputs pins.
➡Connect pin 3 of the NE555 ic to the pin 14 of CD4017 for receiving clock the pulses from NE555 ic
Power Supply:
➡Connect pins 4 and 8 of NE555 to the positive supply voltage
➡Connect pin 1 of NE555 to the ground.
➡Connect pins 16 of CD4017 to the positive supply voltage
➡Connect pins 8,15 and 13 of CD4017 to the Ground
➡Power up the circuit by connecting the 5 to 9V DC supply.
Complete Circuit Diagram of Both Way Led Chaser Circuit using NE555 & CD4017
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Operation of Both Way 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).⇒Pin 3 of the NE555 is connected to Pin 14 (CLK) of the CD4017 for receiving clock the pulses.
⇒The CD4017 is a 10-stage counter/divider that produces sequential high outputs for each clock pulse.
⇒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.
⇒The outputs are used to drive the LEDs sequentially.The LEDs are sequentially lighting up in a chasing pattern as the clock pulses continue.
⇒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.
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Step by step video tutorial of Both Way Led Chaser Circuit using NE555 & CD4017 project
Complete setup of Both Way Led Chaser Circuit using NE555 & CD4017
Building a Both-Way LED Chaser Circuit using the NE555 and CD4017 is an exciting project for electronics enthusiasts.The combination of these two ICs allows you to create a dynamic light chasing effect that suitable for various applications.
Ensure that polarity of each LED is correct,the longer lead (anode) connected to the CD4017 output pin through Diode-IN4007 and the shorter lead (cathode) connected to the current-limiting resistor through ground.
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.
So, gather the components,follow the steps and make your own LED chaser circuit to achieved the LEDs chasing effect in both directions.
So, gather the components,follow the steps and make your own LED chaser circuit to achieved the LEDs chasing effect in both directions.
Frequently Asked Questions
How does the NE555 timer IC work in LED Chaser Circuit?
The NE555 is generating a continuous square wave output.This square wave serves as the clock pulse for the CD4017 decade counter that driving the LEDs in a sequence.
What is the role of the CD4017 decade counter in LED Chaser Circuit?
The CD4017 decade counter has ten output pins (Q0 to Q9) that sequentially go high with each clock pulse.These outputs are connected to individual LEDs, creating a chasing effect.
Can I customize the speed of the LED chaser?
Yes,you can customize the speed of the LED chaser by adding a potentiometer to the NE555. different resistor will alter the frequency of the square wave signal and, consequently, the speed of the LED chaser.
Happy building!
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