void setup() {
  // put your setup code here, to run once:
pinMode(7,OUTPUT);
pinMode(8,OUTPUT);
pinMode(9,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(7, HIGH);
delay(2000);
digitalWrite(7, 0);
delay(100);

digitalWrite(8, HIGH);
delay(2000);
digitalWrite(8, 0);
delay(100);

digitalWrite(9, HIGH);
delay(2000);
digitalWrite(9, 0);
delay(100);
}
//ATMEGA 328
//0-13 - DIGITAL PINS
// 1/0 -  HIGH(5V), LOW(0)
// PWN - PULSE WIDTH MODULATION 
// GND - GROUND
// AREF-  AVERAGE REFERENCE PIN
//TX- TRANSMITTER PIN
//RX - RECEIVER PIN
// ARDUINO BOARD WORKS 5V POWER SUPPLY
//VIN - VOLTAGE INPUT PIN
// LED - 
// ANODE (+VE), CATHODE (-VE)


//PIR SENSOR PIN CONFIGURATION
// VCC(+VE) - 3.3V OR 5V
// O/P PIN - 2 TO 13 PIN (ANY ONE)
// GND - GROUNF PIN