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Write a program to interface LEDs on pin no. 10,11,12,13 and blink alternatively at the delay of 1 sec.

Last Updated : 16 Jul 2025

Solution: 

void setup(){
    // Initialize pins 10 through 13 as outputs
    for(int led = 10; led <= 13; led++) {
        pinMode(led, OUTPUT);
    }
}

void loop(){
    // Cycle through pins 10 to 13, turning each on and off
    for(int led = 10; led <= 13; led++) {
        digitalWrite(led, HIGH);  // Turn the LED on
        delay(1000);              // Wait for 1 second
        digitalWrite(led, LOW);   // Turn the LED off
    }
}
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