Arduino Potentiometer Analog Read Example
mediumAnalog inputArduino (C++)
analogRead() measures a voltage — the way the Arduino reads knobs and most analog sensors.
The question
A potentiometer's middle leg is on A2. Read it with analogRead() and print the value (0–1023) to the Serial Monitor at 9600 baud every 200 ms.
The sketch
sketch.ino
void setup() {
Serial.begin(9600);
}
void loop() {
int value = analogRead(A2);
Serial.println(value);
delay(200);
}Wiring
Potentiometer outer legs → 5V and GND; middle leg → A2.
How it works
- 1The potentiometer's outer legs go to 5V and GND; the middle leg gives a voltage in between.
- 2analogRead(A0) turns 0–5 V into a number from 0 to 1023.
- 3The value is printed to the Serial Monitor so you can watch it change.
Common mistakes
- Reading a digital pin number instead of A0–A5.
- Expecting 0–255 — analogRead gives 0–1023; analogWrite takes 0–255.
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