Running LEDs / LED Sequencer Using 555 timer IC

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In this Running LED circuit, the LEDs turn ON and OFF in a steady progression one by one or in a sequential fashion. The circuit is quite simple to fabricate with a low budget. All the mentioned components are easily accessible in the market.

Right now, the NE555 timer IC wires as a multivibrator oscillator. The oscillator wires are in self-activated mode and the 100k potentiometer utilizes for controlling the speed of the running lights.

The NE555 timer IC is an adaptable chip and it can play a vital role in electronic circuit applications. It may utilize easy to complex circuits. For instance, from a basic multivibrator to robotics. Right now, it employs to generate a running LED effect utilizing 10 LEDs of different shadings. Each LED is associated with its own 1K current constraining resistor.

Hardware Components

The following components are required to make LED Sequencer Circuit

S.no	Components	Value	Qty
1.	IC	NE555 timer	1
2.	Potentiometer	100k	1
3.	LEDs	–	10
4.	Resistors	1kΩ, 10kΩ	10, 1
5.	Electrolytic Capacitor	10µF	1
6.	Ceramic Capacitor	10nF	1
7.	Battery	4.5V – 12V	1

555 IC Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer

LED Sequencer Circuit

Working Explanation

The working of this DIY circuit is quite simple and straightforward. The NE555 timer IC is powered by a DC battery. And the voltage range of the battery ought to be 4.5V – 12V. The 555 timer IC enacts the LEDs associated with its output pins through 1kΩ resistors in a sequential fashion.

The number of LEDs can likewise be expanded by interfacing more LEDs in the circuit in a similar way. The 100K variable resistor is utilized to change the pace of glimmering LEDs. The working voltage of the circuit is 4.5V to 12V DC battery. On the off chance if you are powering the circuit with 4.5V to 6V, at that situation replace the 1K current constraining resistors of all LEDs with 470 ohms resistors.