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

Components and supplies

Resistor 1M ohm

Arduino UNO

Breadboard (generic)

Jumper wires (generic)

Through Hole Resistor, 33 kohm

Apps and platforms

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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