2 · Inputs & sensors
Read a potentiometer
Beginner12 min
Goal
Print the analog value of A0 on the serial monitor.
Why it matters
The 10-bit analog-to-digital converter turns a voltage into a number from 0 to 1023.
Steps
- 01Add a potentiometer on A0.
- 02Serial.begin(9600) inside setup().
- 03analogRead(A0) inside loop().
- 04Print it with Serial.println().
This tutorial runs inside the Circuitly simulator: your wiring and your code are checked automatically at every step.
Next tutorials
- Read a push button
Light the LED only while the button is pressed.
- Toggle button (debounced)
One press turns on, the next turns off — with no contact bounce.
- Convert to volts (map & float)
Turn the ADC's 0–1023 into a 0.00–5.00 V reading.
- Light sensor (LDR)
Turn the LED on automatically when the room gets dark.