simple arduino coding

copy codes and upload in arduino IDE that's all

coding:

1. For ultrasonic sensor
2. For relay 
3. For bluetooth

coding for ultrasonic sensor 

#define trig 5

#define echo 6

void setup() {

  Serial.begin(9600);

  pinMode(trig,OUTPUT);

  pinMode(echo,INPUT);

  pinMode(13,OUTPUT);

}

void loop() {

  long duration , distance;

  

  digitalWrite(trig,LOW);

  delay(2);

  digitalWrite(trig,HIGH);

  delay(2);

  digitalWrite(trig,LOW);

  

  duration= pulseIn(echo,HIGH);

  distance=(duration/2)/29.1;

  if(distance <= 10)

  {

    digitalWrite(13,HIGH);

  }

  else

  {

    digitalWrite(13,LOW);

  }

  

 delay(1000);

  

}

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This is the codings for ultrasonic sensor... 

For reference visit my youtube channel..

youtube video ultrasonic sensor video part1

youtube video ultrasonic sensor video part2

coding for relay 

void setup() {
 pinMode(13,OUTPUT);
 pinMode(12,OUTPUT);
 pinMode(11,OUTPUT);
 pinMode(10,OUTPUT);
 Serial.begin(9600);
}

void loop() {
 digitalWrite(13,HIGH);
 Serial.println("channl 1 is on");
 delay(1000);
 digitalWrite(13,LOW);
 digitalWrite(12,HIGH);
 Serial.println("channl 2 is on");
 delay(1000);
 digitalWrite(12,LOW);
 digitalWrite(11,HIGH);
 Serial.println("channl 3 is on");
 delay(1000);
 digitalWrite(11,LOW);
 digitalWrite(10,HIGH);
 Serial.println("channl 4 is on");
 delay(1000);
 digitalWrite(10,LOW);

}

---------------------------***********----------------------------***************------------------

This is the codings for relay... 

For reference visitmy youtube channel..

youtube videos arduino with relay simple codings

coding for bluetooth

void setup() {
  pinMode(13,OUTPUT);
 Serial.begin(9600);
}

void loop() {
  if(Serial.available()>0)
  {
    int val=Serial.read();
    delay(20);
    if(val=='1')
    {
      digitalWrite(13,HIGH);
      delay(20);
    }
     if(val=='0')
    {
      digitalWrite(13,LOW);
      delay(20);
    }
  }
}
---------------------------***********----------------------------***************------------------



this is the codings for bluetooth module(HC-06)...
For reference visitmy youtube channel..
youtube videos what is bluetooth
youtube videos for bluetooth programming