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Analog Input: The Variable Resistor (Potentiometer) | NexaLearn IoT Lab | NexaLearn

Analog I/O25 دقيقة

Analog Input: The Variable Resistor (Potentiometer)

Reading gradual values instead of just 0 and 1.

Lesson Content

Arduino has an Analog-to-Digital Converter (ADC) with 10-bit precision. This means it reads voltage from 0V to 5V and converts it to a precise number between 0 and 1023. Pins A0 to A5 are dedicated for this purpose. The potentiometer (variable resistor) acts as a voltage divider — as you turn the knob, the voltage entering the pin changes.

Components Needed

Arduino Unoمقاومة متغيرة (Potentiometer)

Wiring Notes

Right leg to 5V, left leg to GND, and the middle leg to pin A0.

Code Example

void setup() {
  Serial.begin(9600);
}
void loop() {
  int sensorValue = analogRead(A0);
  Serial.println(sensorValue); // يعرض القيم من 0 لـ 1023
  delay(100);
}

Common Mistakes

Connecting the middle leg to 5V and a side leg to A0, which will either result in a fixed reading or a short circuit when the knob is turned all the way.

Try in Simulator

Open in Wokwi Simulator

Next Lesson

Serial Monitor (Communicating with Arduino)