Arduino Voltmeter With OLED Display

Hello !

I’m going to show you how to make a voltmeter* with Arduino UNO, an OLED display, 2 resistors and 9 jumpers for less than 5 minutes. With it you will be able to measure Voltage from 0 to 50V (if you exceed it you may damage your Arduino !). Lets begin !

*”A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit” – Wikipedia

Step 1: Parts and Software

For the voltmeter you will need:

  • An Arduino UNO board
  • An OLED display – 1.3′ 132×64 with SH1106 controller
  • 2 resistors – 10 k and 100k
  • A breadboard
  • 9 jumper wires

You will need the Arduino IDE that you can get from:

and the U8glib library for the OLED that you can get from:


Step 2: Making the Voltmeter

I order to measure voltage we will a build a simple voltage divider, but first place the OLED board on the breadboard. Then connect pin 13 to CLK, pin 11 to DIN, pin 9 to CS, pin 8 to D/C and pin 7 to RES.

Pins: 13, 11, 9 are the SPI Bus of the Arduino UNO board.

Now we build the voltage divider, plug the resistors on the breadboard and connect them for each other, the other side of the 100k resistor connect to ground, the connection between both reistors to analog 0 and the other side of the 10k resistor to the source you wish to measure, like on the schematic above.

After that move to the next step.

Step 3: Code

In this step, we are going to see how to program the voltmeter that you just built. You can find the whole code for the voltmeter on the corresponding GitHub repository:…

We are now going to program the board. The first step is to plug in the USB cable in the board and the other side in your PC.

Read more: Arduino Voltmeter With OLED Display

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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