Arduino Education Lab Pro

Learn electronics and programming with interactive Arduino projects. Click on a category below to get started!

• Basics
• Sensors
• Projects

const int ledPin = 9; // Use a PWM pin for flexibility

void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  digitalWrite(ledPin, HIGH);
  delay(1000);
  digitalWrite(ledPin, LOW);
  delay(1000);
}

const int buttonPin = 2;
const int ledPin = 13; // Use built-in LED for feedback
int buttonState = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop() {
  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }
}

const int ldrPin = A0;
int ldrValue = 0;

void setup() {
  Serial.begin(9600);
}

void loop() {
  ldrValue = analogRead(ldrPin);
  Serial.print("Light Level: ");
  Serial.println(ldrValue);
  delay(200);
}

#include "DHT.h"
#define DHTPIN 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  delay(2000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %  |  Temperature: ");
  Serial.print(t);
  Serial.println(" °C");
}

const int trigPin = 9;
const int echoPin = 10;
long duration;
int distance;

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

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
}

int pirPin = 2;
int pirState = LOW;

void setup() {
  pinMode(pirPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  if (digitalRead(pirPin) == HIGH) {
    if (pirState == LOW) {
      Serial.println("Motion detected!");
      pirState = HIGH;
    }
  } else {
    if (pirState == HIGH) {
      Serial.println("Motion ended!");
      pirState = LOW;
    }
  }
}

#include <IRremote.h>
int RECV_PIN = 11;
IRrecv irrecv(RECV_PIN);
decode_results results;

void setup() {
  Serial.begin(9600);
  irrecv.enableIRIn(); // Start the receiver
}

void loop() {
  if (irrecv.decode(&results)) {
    Serial.println(results.value, HEX);
    irrecv.resume(); // Receive the next value
  }
  delay(100);
}

int VRx = A0;
int VRy = A1;
int SW = 2;
int xValue = 0;
int yValue = 0;
int swState = 0;

void setup() {
  pinMode(SW, INPUT_PULLUP); // Enable internal pull-up resistor
  Serial.begin(9600);
}

void loop() {
  xValue = analogRead(VRx);
  yValue = analogRead(VRy);
  swState = digitalRead(SW);
  Serial.print("X: ");
  Serial.print(xValue);
  Serial.print(" | Y: ");
  Serial.print(yValue);
  Serial.print(" | Switch: ");
  Serial.println(swState);
  delay(100);
}

const int ldrPin = A0;
const int ledPin = 9;
int ldrValue = 0;
int threshold = 400;

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

void loop() {
  ldrValue = analogRead(ldrPin);
  if (ldrValue < threshold) {
    digitalWrite(ledPin, HIGH);
  } else {
    digitalWrite(ledPin, LOW);
  }
  delay(200);
}

#include <LiquidCrystal_I2C.h>
#include "DHT.h"
#define DHTPIN 2
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27

void setup() {
  lcd.init();
  lcd.backlight();
  dht.begin();
}

void loop() {
  delay(2000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  if (isnan(h) || isnan(t)) { lcd.print("Sensor Error!"); return; }
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(t);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Humid: ");
  lcd.print(h);
  lcd.print(" %");
}

#include <Servo.h>
Servo myServo;
int servoPin = 9;

void setup() {
  myServo.attach(servoPin);
}

void loop() {
  myServo.write(0);
  delay(1000);
  myServo.write(90);
  delay(1000);
  myServo.write(180);
  delay(1000);
}

int relayPin = 7;

void setup() {
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Assume LOW is OFF
  Serial.begin(9600);
  Serial.println("Relay Control Initialized");
}

void loop() {
  Serial.println("Turning Relay ON");
  digitalWrite(relayPin, HIGH); // Turn Relay ON
  delay(2000);
  Serial.println("Turning Relay OFF");
  digitalWrite(relayPin, LOW); // Turn Relay OFF
  delay(2000);
}

int redPin = 9;
int greenPin = 10;
int bluePin = 11;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop() {
  setColor(255, 0, 0); // Red
  delay(1000);
  setColor(0, 255, 0); // Green
  delay(1000);
  setColor(0, 0, 255); // Blue
  delay(1000);
  setColor(255, 255, 0); // Yellow
  delay(1000);
  setColor(80, 0, 80); // Purple
  delay(1000);
  setColor(0, 255, 255); // Aqua
  delay(1000);
}

void setColor(int red, int green, int blue) {
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);
}