MISSION 03 · GATHER

Meet Our Robot Parts

Every part has a job. Tap the button to meet them one at a time.

MISSION 04 · CONNECT

Let's Connect Our Sensor

Follow the wires carefully. The correct connections help your robot work!

MISSION 06 · UNDERSTAND

How Does It Work?

The robot listens, thinks, and then acts.

MISSION 08 · INSTRUCT

Our Robot's Instructions

Here is the complete program. Your presenter will unpack it aloud.

const int trigPin = 9;
const int echoPin = 10;
const int ledPin = 13;

long duration;
float distance;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH, 30000);

  if (duration == 0) {
    distance = -1;
  } else {
    distance = duration * 0.0343 / 2;
  }

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  if (distance > 0 && distance <= 15) {
    digitalWrite(ledPin, HIGH);
    delay(250);
    digitalWrite(ledPin, LOW);
    delay(250);
  } else {
    digitalWrite(ledPin, LOW);
    delay(100);
  }
}

MISSION 10 · CHALLENGE

Can You Outsmart the Robot?

Choose an answer for each quick challenge.

MISSION 11 · IMAGINE

Where Can We Use This?

Distance sensing is useful far beyond our classroom.