Arduino DC Voltmeter (0-30V) with Lcd display

Overview

In this video tutorial, we will learn how to make a dc voltmeter using Arduino. This is very easy to make and useful project for the people of electronics lovers.

You can watch the following video below:-

Components Required

The required components list for this project given below:-

• Arduino Uno
• 16*2 Lcd Display 
• 10k Potentiometer
• 100k ohm Resistor
• 10k ohm Resistor
• 220-ohm Resistor
• Breadboard
• Some Jumper Wire

Pinout

Circuit Schematic

The circuit diagram of the Dc voltmeter using Arduino has been given below:-

Fig: Dc Voltmeter using Arduino

Circuit Description

Source Code

The source code is given below:-

 /*  
  DC Voltmeter  
  An Arduino based on voltage divider concept  
  Shahadat Hossen Razib  
  Youtube Channel: Razib Shahadat  
 */  
   
 #include <LiquidCrystal.h>  
 LiquidCrystal lcd(2, 3, 4, 5, 6, 7);  
 int analogInput = 0;  
 float vout = 0.0;  
 float vin = 0.0;  
 float R1 = 100000.0; // resistance of R1 (100K)  
 float R2 = 10000.0; // resistance of R2 (10K)  
 int value = 0;  
 int a[5] = {};  
 void setup() {  
  Serial.begin(9600);  
  pinMode(analogInput, INPUT);  
  lcd.begin(16, 2);  
  lcd.setCursor(2, 0);  
  lcd.print("DC VOLTMETER");  
  lcd.setCursor(0, 1);  
  lcd.print("-RAZIB SHAHADAT-");  
  delay(3000);  
  lcd.clear();  
   
 }  
 void loop() {  
  lcd.print("DC Voltmeter");  
  // read the value at analog input  
  value = analogRead(analogInput);  
  vout = (value * 5) / 1024.0;  
  vin = vout / (R2 / (R1 + R2));  
  Serial.println(vin);  
  if (vin < 0.09)  
  {  
   vin = 0.0;  
  }  
  lcd.setCursor(0, 1);  
  lcd.print("Voltage V :");  
  lcd.print(vin);  
  delay(3000);  
  lcd.clear();  
 }