Learn ARDUINO-C-CPP with Real Code Examples

void setup() {
    pinMode(13, OUTPUT);
}

void loop() {
    digitalWrite(13, HIGH);
    delay(500);
    digitalWrite(13, LOW);
    delay(500);
}

Toggle an LED on pin 13 every 500 ms.

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

void loop() {
    int sensorValue = analogRead(A0);
    Serial.println(sensorValue);
    delay(100);
}

Read a potentiometer value and print it to the serial monitor.

#include <Servo.h>
Servo myServo;

void setup() {
    myServo.attach(9);
}

void loop() {
    for(int pos = 0; pos <= 180; pos++) {
        myServo.write(pos);
        delay(15);
    }
    for(int pos = 180; pos >= 0; pos--) {
        myServo.write(pos);
        delay(15);
    }
}

Sweep a servo motor from 0° to 180° and back.