# Lesson 10: Using Potentiometer reading voltage, Analog and Digital

We first learn the difference between Analog and digital. Then we learn what is Potentiometer and how to measure DC voltage with Arduino and the how to find the value of resistor.

``````
/*
* S01-10 Potentiometer
Please watch video instruction here https://youtu.be/wuNrzQ8rpYw
This code is available at http://robojax.com/course1/?vid=lecture10

with over 100 lectures Free On  YouTube Watch it here http://robojax.com/L/?id=338
Get the code for the course: http://robojax.com/L/?id=339
* Feb 23, 2019
*
*/
const int potPin = A0;// pint name for reading voltage

void setup() {
Serial.begin(9600);// initialize the serial monitor

}

void loop() {
//Robojax Step By Step Arduino Course http://robojax.com/L/?id=338

Serial.print("potValue:");
Serial.print(potValue);
Serial.print(" Voltage:");
float voltage = potValue * (5.0 / 1023.0);
Serial.print(voltage);
Serial.println("V");
if(voltage >= 2.8 && voltage <= 4.1)
{
Serial.println("Voltage between 2.8 and 4.1");
}
delay(200);

}

```  ```

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