Get to know the board
Discover the pins, power connections, and the tiny computer at the heart of an Arduino Uno.
● INTERACTIVE WORKSPACE / ARDUINO UNO
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01 / THE BOARD
Meet your Arduino.
Explore the board. Every great idea starts here.
BUILD THE CIRCUITConnect both wires to complete the circuit.
Circuit openPOTENTIOMETER · A0Adjust the input while the sketch runs.
A0 not read · D9 PWM 0RGB MIXER · VIRTUAL INPUTSInputs A0–A2 feed the running sketch.
D9 0 · D10 0 · D11 0LIGHT SENSOR · A0Illustrative light level; higher values mean brighter.
A0 not read · D13 LED offULTRASONIC SENSOR · D9 / D10Idealised echo; scene is not to scale.
Echo not measuredPASSIVE BUZZER · D8Sound starts only after Run is pressed.
D8 · silentAudio begins after Run.EIGHT-KEY PIANO · D8 BUZZERHold a key after pressing Run. Keyboard: A S D F G H J K.
D8 · silentAudio begins after Run.DC MOTOR · PWM D9Illustrative speed; external supply, transistor, resistor, diode and shared ground.
D9 PWM 0 · motor stoppedTMP36 SENSOR · A0Ideal model, 5 V reference, quantised ADC.
750 mV · A0 not readSERVO · D9Ideal position; separate supply and shared ground shown schematically.
Signal off · position 90°STEPPER · D8–D11Idealised motion · 2048 model steps per turn.
Program 0 · shaft 0 · stoppedSOIL SENSOR · A0Illustrative moisture input and OLED text.
A0 not read · display blankFORCE SENSOR · A0Uncalibrated input · servo on D9, buzzer on D8.
A0 not read · needle 90°D8 · silentAudio begins after Run.SMART TRAFFIC LIGHTIdeal echo; 0–15 cm red, 16–30 cm yellow, farther or no echo green.
Lights offCLICK A PART · DRAG TO ROTATE · SCROLL TO ZOOM