LED Chaser using 555 IC and 4017 IC

LED Chaser 555 timer IC 4017 IC

555 Modes

Basically 555 timer IC can be used in 3 modes 1. Monostable Mode 2. Bistable Mode 3. Astable Mode.

In this blog we discussed about how 555 Timer can be used as LED Chaser using Astable Multivibrator mode of 555 Timer lC and 4017 IC.

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555 Timer Pin Diagram

PIN 1 is Ground Pin, Pin 2 is the Trigger Pin, PIN 3 is Output Pin, Pin 4 represents Reset Pin, Pin 5 is the Control Voltage, PIN 6 is Threshold, PIN 7 is the Discharge PIN and PIN 8 represents Power Supply or Vcc.

555 Pin Diagram

555 Timer Internal Architecture

555 Timer is divided into 5 parts. First part is voltage divider circuit, second comparator block, third flip-flop circuit, fourth discharge circuit and last output driver circuit.

555 internal block diagram

What is an IC 4017

The CD4017 IC is a Decade Counter, it will count from 0 to 10 as it includes 10 separate outputs and is frequently used in designing the 10 LEDs based circuits to run the chaser light.

4017 Pin Diagram

PIN 8 is Ground PinPIN 12 is Carry Out Pin, Pin 14 is the Clock Pin, Pin 15 represents Reset Pin, PIN 16 represents Power Supply or Vcc and Pin 3 (Q0) – Pin 2 (Q1) – Pin 4 (Q2) – Pin 7 (Q3) – Pin 10 (Q4) – Pin 1 (Q5) – Pin 5 (Q6) – Pin 6 (Q7) – Pin 9 (Q8) – Pin 11 (Q9) are all Output Pins.

4017 Pin Diagram

LED Chaser Schematics Circuit Diagram

4017 IC and 555 Timer schematic circuit diagram

LED Chaser Circuit Diagram

555 timer’s PIN2 is connected to PIN6 and a capacitor(Here we used 4.7microF) is connected with PIN2 & Ground. PIN6 is also connected to PIN7 with a 100Kohm resistance. PIN7 is connected to PIN8 with a 10Kohm resistor as PIN8 is the Power Supply or VCC. 555 Timer’s PIN3 is connected to PIN14 of 4017 IC. PIN8 and PIN13 of 4017 IC is connected to Ground. PIN16 of 4017 IC is connected to Positive Terminal.

555 timer and 4017 ic led chaser

PIN1 (Output 5) is connected to PIN15 (Reset) of 4017 IC because when Ouput 5 (PIN1) Triggers, 4017 IC resets and stats from Ouput 0 (PIN 3) and goes on.



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