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OPEN IDEAS / PRACTICAL CODE

Code that moves.

A few small examples for exploring motors, sensors and decisions. Adapt them to your own hardware and test safely.

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THE STARTING BLOCKS

Take an idea.
Make it yours.

Illustrative snippets, not instructions for a specific AlJazriLab product configuration.

01 / MOTORS

Drive a motor with PWM

A simple Arduino example of variable motor speed. Check your driver and power wiring before use.

// Example pins for a motor driver
const int enablePin = 9;
const int directionPin = 8;

void setup() {
  pinMode(enablePin, OUTPUT);
  pinMode(directionPin, OUTPUT);
}

void loop() {
  digitalWrite(directionPin, HIGH);
  analogWrite(enablePin, 160); // speed: 0–255
  delay(1000);
  analogWrite(enablePin, 0);
  delay(1000);
}
02 / SENSORS

Read an ultrasonic sensor

Measure the time of an echo pulse and convert it to an approximate distance in centimeters.

const int triggerPin = 7;
const int echoPin = 6;

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

void loop() {
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  long pulse = pulseIn(echoPin, HIGH, 30000);
  if (pulse > 0) {
    float cm = pulse * 0.0343 / 2;
    Serial.println(cm);
  }
  delay(150);
}
03 / LOGIC

React to distance

A small, hardware-agnostic Python example of turning sensor readings into a decision.

def choose_action(distance_cm):
    if distance_cm < 20:
        return "stop and turn"
    return "continue forward"

for distance in (42, 18, 30):
    print(distance, choose_action(distance))
04 / LOGIC

Keep a build log

Record test observations so you can compare changes across your build iterations.

tests = []

def record_test(change, result):
    tests.append({"change": change, "result": result})

record_test("lower motor speed", "turns more smoothly")
record_test("move sensor", "detects edges sooner")

for test in tests:
    print(test["change"], "→", test["result"])

Pin assignments and driver requirements vary. Verify your components and wiring before powering a build.

THE NEXT EXPERIMENT

What would you build next?

The code library will grow with the project. Tell us which topics you want to explore.

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