Make Arduino UNO Voltmeter Within 2 Minutes!

In this project you'll see how to make a voltmeter using an Arduino UNO

May 30, 2022

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voltmeter

arduino uno voltmeter

arduino uno projects

arduino voltmeter

Devices & Components

Arduino Uno Rev3

Resistor 1M ohm

Breadboard (generic)

Jumper wires (generic)

Through Hole Resistor, 33 kohm

Software & Tools

Arduino IDE

Project description

Code

arduino voltmeter code

arduino

this code will work only if the resistor value is approx. similar to the shown

1float input_volt = 0.0;
2float temp = 0.0;
3float r1 = 33000.0;
4float  r2 = 840000.0;
5
6void setup()
7{
8  Serial.begin(9600);
9}
10
11void  loop()
12{
13
14  int analogvalue = analogRead(A2);
15  temp = (analogvalue  * 5.0) / 1024.0;
16  input_volt = temp / (r2 / (r1 + r2));
17  if (input_volt  < 0.1)
18  {
19    input_volt = 0.0;
20  }
21  Serial.print("Volts =  ");
22  Serial.println(input_volt);
23
24  delay(100);
25
26
27}

float input_volt = 0.0;
float temp = 0.0;
float r1 = 33000.0;
float  r2 = 840000.0;

void setup()
{
  Serial.begin(9600);
}

void  loop()
{

  int analogvalue = analogRead(A2);
  temp = (analogvalue  * 5.0) / 1024.0;
  input_volt = temp / (r2 / (r1 + r2));
  if (input_volt  < 0.1)
  {
    input_volt = 0.0;
  }
  Serial.print("Volts =  ");
  Serial.println(input_volt);

  delay(100);


}

arduino voltmeter code

arduino

this code will work only if the resistor value is approx. similar to the shown

1float input_volt = 0.0;
2float temp = 0.0;
3float r1 = 33000.0;
4float
5  r2 = 840000.0;
6
7void setup()
8{
9  Serial.begin(9600);
10}
11
12void
13  loop()
14{
15
16  int analogvalue = analogRead(A2);
17  temp = (analogvalue
18  * 5.0) / 1024.0;
19  input_volt = temp / (r2 / (r1 + r2));
20  if (input_volt
21  < 0.1)
22  {
23    input_volt = 0.0;
24  }
25  Serial.print("Volts =  ");
26
27  Serial.println(input_volt);
28
29  delay(100);
30
31
32}

float input_volt = 0.0;
float temp = 0.0;
float r1 = 33000.0;
float
  r2 = 840000.0;

void setup()
{
  Serial.begin(9600);
}

void
  loop()
{

  int analogvalue = analogRead(A2);
  temp = (analogvalue
  * 5.0) / 1024.0;
  input_volt = temp / (r2 / (r1 + r2));
  if (input_volt
  < 0.1)
  {
    input_volt = 0.0;
  }
  Serial.print("Volts =  ");

  Serial.println(input_volt);

  delay(100);


}

Downloadable files

circuit diagram of arduino voltmeter

the sketch has been made on Proteus IDE

circuit diagram of arduino voltmeter

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