Lesson 10: Using Potentiometer reading voltage, Analog and Digital

Please select other codes for this lecture from the links below.

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.

Using this code you can find unknown R value


 /*
 * S01-10 Potentiometer R value

  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 
 * Written by Ahmad Shamshiri for Robojax, robojax.com http:youTube.com/robojaxTV
 * Feb 23, 2019
 * 
 */
const int potPin = A0;// pint name for reading voltage
float RT = 10000;// the potentiometer value 10k
float R;// the unknow R value

void setup() {
  Serial.begin(9600);// initialize the serial monitor
  Serial.println("Reading Analog vlaue");

}

void loop() {
  int potValue = analogRead(potPin);// read the input value 
  float voltage = potValue * (5.0 / 1023.0);// calculate voltage
  R = ( voltage * RT)/5.0;// calculate R
  Serial.print("R :");
  Serial.print(R);
  Serial.print(" Ohms V:");
  Serial.print(voltage);
  Serial.println("V");
  delay(200);

}