DIY Ohmmeter using Arduino

Measurement of unknown resistance using Arduino.

May 10, 2021

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environmental sensing

debugging tools

monitoring

Components and supplies

Jumper wires (generic)

Arduino Nano R3

Resistor 1k ohm

Apps and platforms

Arduino IDE

Project description

Code

Resistance measurement using Arduino

arduino

1int analogPin= 0; //Analog Pin A0
2int raw= 0;
3int Vin= 5; //input
4  voltage 5 volts
5float Vout= 0;
6float R1= 1000; //mention R1(Known Resistance,in
7  my case 1000 Ohm)
8float R2= 0;
9float buffer= 0;
10
11void setup()
12{
13
14  Serial.begin(9600);
15}
16
17void loop()
18{
19  raw= analogRead(analogPin);
20
21  if(raw) 
22  { 
23    buffer= raw * Vin;
24    Vout= (buffer)/1024.0;
25    buffer=
26  (Vin/Vout) -1;
27    R2= R1 * buffer;
28    Serial.print("Output voltage: ");
29
30    Serial.print(Vout);
31    Serial.println(" Volts");
32    Serial.print("Resistor
33  value: ");
34    Serial.print(R2);
35    Serial.println(" Ohm");
36    delay(1000);
37
38  }
39}
40

int analogPin= 0; //Analog Pin A0
int raw= 0;
int Vin= 5; //input
  voltage 5 volts
float Vout= 0;
float R1= 1000; //mention R1(Known Resistance,in
  my case 1000 Ohm)
float R2= 0;
float buffer= 0;

void setup()
{

  Serial.begin(9600);
}

void loop()
{
  raw= analogRead(analogPin);

  if(raw) 
  { 
    buffer= raw * Vin;
    Vout= (buffer)/1024.0;
    buffer=
  (Vin/Vout) -1;
    R2= R1 * buffer;
    Serial.print("Output voltage: ");

    Serial.print(Vout);
    Serial.println(" Volts");
    Serial.print("Resistor
  value: ");
    Serial.print(R2);
    Serial.println(" Ohm");
    delay(1000);

  }
}

Downloadable files

Resistance measurement using Arduino

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