Arduino based Volt Meter 0-50V DC

 Arduino based Volt Meter 0-50V DC

0-50V DC Voltmeter using Arduino & Seven Segement Display

---

Introduction:

This time we will be interfacing Arduino to measure voltage ranging from 0-50V with almost no error at all. This DC voltmeter is linear with voltage and shows linear characteristics from 0.01 Volt to 50 Volt. Voltage beyond 50 Volt isn’t measurable by it. The above figure shows the 0-50V DC Voltmeter using Arduino and Seven Segment Display.

The Arduino inbuilt 10 bit ADC, can be used for measuring the 0-50V.  measured DC voltage can be seen on Serial monitor

---

Parts & Components:

1. Arduino UNO Board
2. Bread Board
3. Resistors – 10K & 100K

Design & Explanation:

The voltage divider circuit is used to divide voltage into two parts, out of which one is fed to the input analog terminal of Arduino. Internal reference voltage as Vref 1.1V of Arduino is selected for measurement.

The resistor R1and R2 forms the voltage divider which is connected to analog input pin A0 of Arduino.
 at the A0 pin, is used for high voltage protection for Arduino.

Vout = (R2 / R1+R2 ) * Vin.

 

If Vin is 50V then

 val = analogRead(A0);//reads the analog input

   Vout = (val * 5.00) / 1024.00; // formula for calculating voltage out i.e. V+, here 5.00

   Vin = Vout / (R2/(R1+R2)); // formula for calculating voltage in i.e. GND

---

---

The same project can also be implemented using Atmega328 micro-controller. All you need to do is replace the Arduino Board with Atmega328 micro-controller, with addition of few more components as in the circuit diagram below.

---

Programming & Source Code:

Here is a code for 0-50V DC Voltmeter using Arduino. The programming is written in the Arduino language and the same program is applicable for both circuits. For the first circuit, you can directly upload the program. And for the 2nd circuit, you need to upload the program to ATmega328. This is done by replacing the ATmega328 microcontroller on Arduino Uno Board with a fresh ATmega328 micro-controller. Before uploading you need to upload bootloader, then the only program can be successfully uploaded.

float Vout = 0.00;

float Vin = 0.00;

float R1 = 100000.00; // resistance of R1 (100K) 

float R2 = 10000.00; // resistance of R2 (10K) 

int val = 0;

void setup(){

   Serial.begin(9600); //BaudRate

}

void loop(){

   

   val = analogRead(A0);//reads the analog input

   Vout = (val * 5.00) / 1024.00; // formula for calculating voltage out i.e. V+, here 5.00

   Vin = Vout / (R2/(R1+R2)); // formula for calculating voltage in i.e. GND

Serial.print("\t Voltage of the given source = ");

Serial.println(Vin);

delay(1000); //for maintaining the speed of the output in serial moniter

}