How to Make 4-Digit DC Volt Meter using Arduino


The Arduino board has revolutionized the world of electronics with its simplicity and versatility. It allows even beginners to create a wide range of projects with ease. In this article, we will explore how to make a 4-digit DC Volt Meter using Arduino. This volt meter can measure upto 100V DC. We will also discuss the components used in this project, namely Arduino Nano, 4-Digit 7 Segment (CA) display, and 10K Trimpot.

Introduction to Major Components:

Arduino Nano:

The Arduino Nano is a compact-sized board that is based on the ATmega328P microcontroller. It offers the same functionality as the larger Arduino boards, such as the Uno, but in a smaller form factor. The Nano has 14 digital input/output pins, 8 analog inputs, and a 16 MHz crystal oscillator. It is an ideal choice for projects where space is limited.

4-Digit 7 Segment (CA) Display:

The 4-Digit 7 Segment display (CA) is a common choice for projects that require numeric output. It consists of four individual 7-segment LED displays arranged in a single package. Each segment can be individually controlled to display any digit from 0 to 9. The display is connected to the Arduino using a combination of digital pins and current limiting resistors.

10K Trimpot:

The 10K trimpot, also known as a trimmer resistor or trim resistor, is a variable resistor used to adjust or fine-tune the resistance in a circuit. It consists of a resistive track with a wiper that can be adjusted to change the resistance value. In this project, the trimpot will be used to calibrate the voltage readings of the DC volt meter.

How to Make 4-Digit DC Volt Meter using Arduino
4-Digit DC Volt Meter using Arduino

Circuit Diagram of 4-Digit DC Volt Meter using Arduino

This project can be designed using a few basic components. The circuit diagram of this project is shown below.

How to Make 4-Digit DC Volt Meter Circuit Diagram
4-Digit DC Volt Meter Circuit Diagram

More Circuit Layouts

Components List of 4-Digit DC Volt Meter using Arduino

Following is the list of all components used in this project:

  • 1x 10K TRIMPOT
  • 1X 220K 3W Resistor

Project Code Files:

Arduino Code File:

Building the 4-Digit DC Volt Meter using Arduino

To build the 4-Digit DC Volt Meter, we will start by connecting the Arduino Nano to the 4-Digit 7 Segment display and the 10K Trimpot. Here are the steps:

  1. Insert the Arduino Nano and a 3 pin terminal block on the board and connect its center pin to GND of Arduino.
  2. Connect anode of 1n4007 diode to pin-1 of block terminal and connect its cathode to VIN pin of Arduino.
  3. Now connect a 220k resister to pin-3 of terminal block. Now insert a 10k trimpot and connect its pin-1 of the remaining pin of 10k resister. Its pin-3 to ground and center pin to A0 of the Arduino.
  4. Now insert a 10uf capacitor and connect its positive pin to pin-1 of 10k trimpot and negative pin to ground.
  5. Now insert a 4-digit 7 segment dispay. Connect its pin-1 to D6 of Arduino, pin-2 to D5, pin-3 to D9, pin-4 to D4 , pin-5 to D8, pin-6 to D10, pin-7 to D3, pin-8 to D11, pin-9 to D12, pin-10 to D7, pin-11 to D2, pin-12 to D13 of the Arduino.

So we have completed all the connections and we can now proceed to the software part of the project to upload the code to the Arduino Nano.

Programming the Arduino Nano:

To program the Arduino Nano for the 4-Digit DC Volt Meter, we will need to install the necessary libraries and write the code. We have already provided the code files above in the Project Code Files section for download. Upload the code to the Arduino Nano and test the project.

Conclusion of 4-Digit DC Volt Meter using Arduino

In conclusion, creating a 4-Digit DC Volt Meter using Arduino is a straightforward project that can be accomplished by anyone, even those with limited programming experience. With the Arduino Nano as the brain, the 4-Digit 7 Segment (CA) display for numeric output, and the 10K trimpot for calibration, this project allows you to measure and display DC voltages accurately.

The combination of these components, along with the programming skills required, opens up a world of possibilities for other electronic projects. The Arduino Nano, with its compact size, makes it suitable for projects where space is limited. The 4-Digit 7 Segment display provides a clear and concise way of showcasing numerical data, while the 10K trimpot allows for precise calibration.

Overall, building a 4-Digit DC Volt Meter using Arduino not only provides a hands-on experience in electronics but also serves as a stepping stone to more advanced projects. Whether you are a beginner or an experienced hobbyist, working with Arduino opens up endless opportunities to explore and create innovative electronic solutions.

More projects, You may like:

For more project and circuit diagrams, you can go through the Schematics in the main menu where you can find many interesting projects and circuit diagrams like audio amplifier circuits, voltage booster circuitbattery charger circuit and timer circuits etc., which are all beginner circuit projects. Feel free to check them out!

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