Thursday, July 23, 2020

LED Chaser or Sequencer Using 555 & 4017 | Running LED

In this tutorial, I will show you how to make a simple LED Chaser or Sequencer using a 555 & 4017 circuits. 

If you prefer watching video mode or want to see the circuit working please click here to watch it on YouTube

Parts List
  • 1 * 555 Timer
  • 1 * 4017 Decade Counter
  • 5 * Blue LED
  • 5 * Green LED
  • 2 * 1.5k Ohm Resistor
  • 1 * 0.01uF Ceramic Capacitor
  • 1 * 4.7uF/50V Electrolytic Capacitor
  • 1 * 10k Potentiometer

    For this project, the main components are 555 Timer & 4017 Decade Counter. The 555 IC is a timer integrated circuit and can be operated in Astable or Monostable mode. The 4017 Decade counter is a 5-stage divide by 10 Johnson counter with 10 decoded outputs and a carry-out bit.

    In this project, The function of the 555 Timer is used to produce the stable clock pulse for the 4017 and it is constructed in Astable Mode.

    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 LEDs to the outputs you get the sequential glow.

    The duration of the glow of LEDs can also be altered by changing the value of the potentiometer (RV1) & the value of C2 Capacitor.or only by changing the value of the potentiometer (RV1).

Circuit Diagram

Side Note

In the circuit diagram, I showed the circuit which counts up to 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 connect only 6 LEDs
  • In that case, you only need to connect the LED from Q0 to Q5 & the Q6 to the Reset Pin15.
  • Remaining pins from Q7 to Q9 will be No Connection.

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