Arduino code for Decoration Piece of Lights

Arduino code for Decoration Piece of Lights

void setup() {

  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
}


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

How to Make Fire Alarm System or heat Detector using Arduino nano | Fire Detector and Fire Alarm

Code for Fire Alarm System or heat Detector.

How to Make Security System using Arduino Nano and Ultrasonic Sensor

Arduino code for Security System using Arduino Nano and Ultrasonic Sensor

int trigPin = 10;
int echoPin = 11;
int Buzzer = 12;


void setup() {
  Serial.begin(9600);
   pinMode(Buzzer, OUTPUT);
   pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  // put your setup code here, to run once:

}

void loop() {
  long duration, distance;
  digitalWrite(trigPin,HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration=pulseIn(echoPin, HIGH);
  distance =(duration/1)/29.1;
   duration=pulseIn(echoPin, LOW);
  Serial.print(distance);
  Serial.println("cm");
  delay(10);

 if((distance<=15))
  {
    digitalWrite(Buzzer, HIGH);
}
   else if(distance>15)
 {
     digitalWrite(Buzzer, LOW);
   }
}