Introduction
The CD4017 is a decade counter IC that can count from 0 to 10 and is commonly used in LED chaser circuits. In this experiment, we will use the 4017 decade counter to create an LED chaser effect, where the LEDs will light up sequentially in response to clock pulses.
Objective
The objective of this experiment is to demonstrate how to use the CD4017 decade counter to create a chaser effect with multiple LEDs.
Components Needed
- 1 x CD4017 Decade Counter IC
- 10 x LEDs (different colors)
- 10 x Resistors (220Ω for each LED)
- 1 x 555 Timer IC (for clock signal)
- 1 x Resistor (for 555 timer, e.g., 10kΩ)
- 1 x Capacitor (for 555 timer, e.g., 10µF)
- 1 x Breadboard
- Connecting Wires
- Power Supply (5V)
Circuit Diagram
Procedure
- Connect pin 1 (GND) of the CD4017 to the ground of the power supply.
- Connect pin 11 (VCC) of the CD4017 to the positive voltage supply (5V).
- Connect the output pins (Q0 to Q9) of the CD4017 to the anodes of the LEDs. Connect the cathodes of the LEDs to ground through a 220Ω resistor.
- Configure the 555 timer in astable mode to generate a clock pulse. Connect pin 1 (GND) to ground, pin 8 (VCC) to 5V, and connect a resistor (R) and capacitor (C) to set the frequency.
- Connect the output (pin 3) of the 555 timer to the clock input (pin 14) of the CD4017.
- Power the circuit. The LEDs will light up sequentially in response to the clock pulses generated by the 555 timer.
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Results
The LEDs should light up one after another, creating a chaser effect. Each LED corresponds to the output of the CD4017, and the sequence will continue cycling as long as the clock signal is present.
Conclusion
In this experiment, we successfully created an LED chaser circuit using the CD4017 decade counter. The combination of the 555 timer and the decade counter allowed us to produce a visually appealing sequence of lighting that can be used in various applications such as decorative lights and visual indicators.
