Build gallery

Prompt

A small cardboard desk fan. One DC motor spins a paper blade. A button on D2 starts and stops it. Arduino Uno. Cutouts, wiring, and code.

Generated wiring

Generated code

// QA log: fan
bool on = false;

void setup() {
  pinMode(2, INPUT_PULLUP);
  pinMode(9, OUTPUT);
}

void loop() {
  if (digitalRead(2) == LOW) {
    on = !on;
    delay(250);
  }
  analogWrite(9, on ? 180 : 0);
}

QA photos

No phone photo in the QA log yet for this build. Wiring and code above are the generated package.

Parts

• Arduino
• motors
• cardboard

Difficulty and time are from the QA log for this prompt, not a timed class period.

If this build gets stuck

• The motors spin but the robot doesn’t drive
• The motor or servo gets hot and stops