Introduction: Running LED | LED Chaser or Sequencer Using 555 & 4017

In this tutorial i will show you how to make simple a LED Chaser or Sequencer using 555 & 4017 circuit. You can watch the video which is embedded in this step for construction, parts list, circuit diagram & testing or you can continue reading the post for further details.

Step 1: Parts & Affiliate List

Picture of Parts & Affiliate List

***Parts List & Affiliate Links***


***Affiliate & Support Links***
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Step 2: Circuit Diagram & Other Details

Picture of Circuit Diagram & Other Details

Construct the circuit as shown in the circuit diagram.

For making the LED Chaser you require 555 Timer & 4017 Counter. The 555 Timer is used to produce the clock pluse for the 4017. The 4017 is constructed in a Astable configuration.

When the clock pulse produced by the 555 timer is fed to the 4017, it starts counting in the upward direction for each pulse. Now when you connect the LED's to the outputs you get the sequential glow.

The duration of the glow of led's can be altered by changing the value of pot (RV1) & the value of C2 Capacitor. or only by changing the value of pot (RV1).

Extra Info :

In the circuit diagram i showed the circuit which counts upto the value 10. You can change the value of count by simply connecting the last sequence to the reset pin. For example

  • Let say you want the count to be 6
  • Then you need to connect the Q0 to Q5 to the LED's & the Q6 to the Reset Pin 15.
  • Remaining pins from Q7 to Q9 will be No Connection.

The testing of the circuit can watched in the video attached in the first step or you can CLICK HERE

Thank You for reading & watching
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