USB Circuit Diagrams

USB LED Lamp Circuit

I’ll show you how to create a simple circuit in this project. This is a simple USB LED Lamp DIY circuit that may be used to give additional illumination for your laptop or tablet computer.


  • Introduction 
  • USB LED Lamp Circuit Diagram
  • USB LED Lamp Circuit Design
    • USB LED Lamp Circuit Simulation Video
  • How to Design the USB LED Lamp Circuit?
  • How to Operate USB LED Lamp Circuit?
  • USB LED Lights Circuit Advantages
  • Applications of USB LED Lamp Circuit


Universal Serial Bus (USB) is an acronym for Universal Serial Bus. The USB standard was created to make it easier to connect a computer to a device. In fact, the USB port is used to connect practically all external devices such as a keyboard, mouse, printer, DVD writer, hard disc drive, and so on.

NOTE: We are only referring to a generic USB port in this project because it is based on the USB port.

Now, when it comes to the project, you may not be able to see the keys on the keyboard correctly due to poor light or power shortages (not a problem if you have a back-lit keyboard). What if you could create a little USB-powered lamp that would solve this problem? A easy solution to this is a USB LED Lamp Circuit.

Because the USB port outputs 5V, it may be utilised to power the simple LED lighting circuit. Another benefit of this lamp is that it eliminates the need for large lamps because all you need is this little USB Powered LED Lamp.

USB LED Lamp Circuit Diagram

Circuit Components

  • USB Male Connector
  • Light Emitting Diodes – 5 X 5mm White LEDs
  • Resistors – 100Ω X 5
  • Perf Board

USB LED Lamp Circuit Design

The main component of the circuit is a male USB connector. USBs are primarily separated into two types: ‘A’ type and ‘B’ type. The shapes of the various types of USB connectors vary. Upstream devices, such as a USB hub or a host, can use Type ‘A’ USB. Downstream devices, such as printers, can use Type ‘B’ USB.

Although the cables will have the same number of pins, they will be mechanically different. Many USB versions have been released. The initial USB 1.0 and 1.1 versions had a transfer rate of 12 Mbps. The data rate of USB 2.0 is 480 Mbps. The data rate of USB 3.0 is projected to be 4.8 Gbps.

Do you know anything about the 3X3X3 LED Cube Circuit?

The type of USB utilised here is ‘A’. There are four pins on it. VCC, GND, D+, and D- are the pins in question. The data pins are the D+ and D- pins. The VCC pin generates a voltage of 5V. The USB LED Lamp with Type ‘A’ male USB connector may simply be plugged into a computer’s USB port.

A two-lead LED is a semiconductor device. LEDs were originally used for indicating, but they are increasingly becoming the primary source of illumination in homes, offices, streets, autos, and other places. A typical P-N junction diode is similar to an LED. The energy emitted is in the form of light when applied with the required voltage, while normal P-N junction diode emits energy in the form of heat.


The hue of light emitted is determined by the semiconductor’s band gap. The LEDs used in this project are standard white LEDs. They feature a 3.6V voltage drop. The LEDs require a current of 40mA. Initially, these LEDs were only available in red; however, high-power LEDs and other coloured LEDs, such as blue LEDs and white LEDs, were created subsequently.

NOTE: The forward voltage and current numbers should be found on the LED’s data sheet.

Between the Light Emitting Diode and the USB lies a 100 ohm resistor. This resistor serves as a current limiter. Because LEDs require a maximum current of 40mA to operate at full brightness, they must be protected from currents greater than this.

As a result, a resistor between the LED and the power source should be used to limit the amount of current passing through the LED. The current drop at the Light Emitting Diode is 40 milli amperes, while the supply voltage from the USB is 5V. The resistor value can be calculated using the formula below.

where, the value of V is 5 volts and the value of I is 40 mA.

So, R= 5V/0.04A =125 ohms

But generally, 125 ohm resistor does not exist in real time. Therefore a resistor of 100Ω is used instead of 125Ω. Though it gives an output current of 50 mA, this can be tolerated by the LED.

USB LED Lamp Circuit Simulation Video

How to Design the USB LED Lamp Circuit?

Take a small piece of perf board and solder the Male USB Connector. Then start soldering the LEDs and 100Ω Resistors. Scrape the edges to smoothen the perf board.

How to Operate USB LED Lamp Circuit?

  • Initially connect the circuit as shown in the circuit diagram.
  • Now insert the USB to the port of the computer.
  • You can observe the lamp glowing
  • Now remove the USB from port.
  • Now lamp is switched off.

USB LED Lights Circuit Advantages

  • This is simple and inexpensive.
  • This is a portable lamp.
  • No extra source is required.

Applications of USB LED Lamp Circuit

  • This can be used as a flashlight in an emergency. Get a sense of how the Automatic LED Emergency Lights Circuit works.
  • This can be used to work on a laptop or computer while the rest of the family sleeps.
  • This lamp can also be used as a reading light.


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