Arduino UNO voltmeter

ArduinoUnoProjex November 30, 2024

Description of the Arduino Voltmeter Code

This Arduino code creates a simple voltmeter capable of measuring voltages from 0 to 5 volts using an LCD 1602 display with I2C communication. The program utilizes the Wire library for I2C communication and the LiquidCrystal_I2C library to manage the LCD display. The positive side of the voltage is connected to analog input A3, where the Arduino reads the voltage value.

In the setup() function, serial communication is initialized at 9600 baud, the LCD display is set up, and the backlight is turned on. The loop() function continuously reads the analog voltage from pin A3, calculates the corresponding voltage (with 1023 representing 5 volts), and displays this value on both the Serial Monitor and the LCD. The readings are updated every half second, with the LCD cleared between updates to ensure clarity.

This project is an excellent introduction to using Arduino for voltage measurement and LCD display interfacing, making it a valuable resource for electronics enthusiasts and beginners.

SCHEMATIC:

schematic

CODE:

/*

  In this example, we’ll use an Arduino to create

  a simple voltmeter with a range of 0 to 5 volts.

*/

#include <Wire.h> // library for controlling devices via I2C

#include <LiquidCrystal_I2C.h> // library for using an LCD 1602 display

LiquidCrystal_I2C lcd(0x27,16,2); // define lcd variable for a 16x2 display

int Vpin = A3; // connect the positive side of the voltage to analog input A3

float voltage; // variable to hold raw analog value

float volts;   // variable to hold calculated voltage value

void setup() // setup procedure runs once when the program starts

{

  Serial.begin(9600); // initialize serial communication at 9600 baud rate

  lcd.init();      // initialize the LCD display

  lcd.backlight(); // turn on the LCD backlight

}

void loop() // loop procedure runs continuously

{

  voltage = analogRead(Vpin); // read the voltage at pin A3

  // calculate voltage based on the analog read (1023 corresponds to 5V)

  volts = voltage / 1023 * 5.0;

  Serial.println(volts); // print the voltage value to the Serial Monitor

  lcd.print("Voltage = "); // display label for voltage reading

  lcd.print(volts); // display calculated voltage on LCD

  delay(500);       // delay for half a second to stabilize the reading

  lcd.clear();      // clear LCD display for the next reading

}

  • Arduino projects
  • Voltmeter tutorial
  • Voltage measurement with Arduino
  • LCD 1602 display
  • I2C communication
  • DIY electronics projects
  • Arduino programming for beginners
  • Analog input reading
  • LiquidCrystal_I2C library
  • Electronics projects for beginners
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