// PROGRAM DESCRIPTION VIDEO AT http://www.youtube.com/@himanshusingheducationist7700
// ARDUINO UNO MICROCONTROLLER BASED PROGRAMS
// FOR O LEVEL COURSE BY NIELIT
// Internet of Things and Its Applications M1-R5
// PROGRAM BY HIMANSHU SINGH
// PROGRAM :2

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

void setup() 
{
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(13, OUTPUT);
}
void loop() 
{
digitalWrite(10, HIGH);
delay(1000);
digitalWrite(10, LOW);

digitalWrite(11, HIGH);
delay(1000);
digitalWrite(11, LOW);

digitalWrite(12, HIGH);
delay(1000);
digitalWrite(12, LOW);

digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW);
}