Simple Arduino Alarm System Using PIR sensor

EEE Arduino projects 

Finishing an Arduino venture gives you a feeling of fulfilment like no other. The issue is, most apprentices aren't sure where to begin, and without past Creator experience, or some kind of gadgets foundation, much fledgeling's undertakings can appear to be fair… well, overwhelming.

Simple Arduino Alarm System Using PIR sensor

simple steps flow to make an alarm system

Step 1: Gather your parts.

Step 2: Wire the Arduino to the breadboard. 

Step 3: Connect your motion sensor. 

Step 4: Plug in the LED. 

Step 5: Connect the piezo buzzer. 

Step 6: Program the Arduino. 

Step 7: Test your alarm. 

Step 1 :required parts

   

       

 piezo buzzer                                     beradboard                                      leds

                                                     PIR sensor

     
Circuit diagram

code explanation

                            initialised pins which are required

set the pin mode initially what condition you required like input OR output

loop for control operation

 copy this Arduino code  

//////This code upload by www.eeeprojectideas.blogspot.com /////// 

//////intalised commands it is delard by  example   int a=12  //////

int ledPin = 13;                // choose the pin for the LED

int inputPin = 2;               // choose the input pin (for PIR sensor)

int PIRState = LOW;             // we start, assuming no motion detected

int val = 0;                    // variable for reading the pin status

int pinSpeaker = 10;           //Set up a speaker on a PWM pin (digital 9, 10, or 11)

\\\where pinmode used to set it is i/p or o/p mode////

\\\\serial used serial board where ardunio range 9600//////

void setup() {

  pinMode(ledPin, OUTPUT);      // declare LED as output

  pinMode(inputPin, INPUT);     // declare sensor as input

  pinMode(pinSpeaker, OUTPUT);

  Serial.begin(9600);

}

void loop(){

  val = digitalRead(inputPin);  // read input value

  if (val == HIGH) {            // check if the input is HIGH

    digitalWrite(ledPin, HIGH);  // turn LED ON

    playTone(300, 160);

    delay(150);

    

    if (pirState == LOW) {

      // we have just turned on

      Serial.println("Motion detected!");

      // We only want to print on the output change, not state

      pirState = HIGH;

    }

  } else {

      digitalWrite(ledPin, LOW); // turn LED OFF

      playTone(0, 0);

      delay(300);    

      if (pirState == HIGH){

      // we have just turned off

      Serial.println("Motion ended!");

      // We only want to print on the output change, not state

      // Inside Of The Serial Port

      pirState = LOW;

    }

  }

}

// Tell Arduino To Play Piezo Buzzer Tone

// duration in msec, frequency in hertz

void playTone(long duration, int freq) {

    duration *= 1000;

    int period = (1.0 / freq) * 1000000;

    long elapsed_time = 0;

    while (elapsed_time < duration) {

        digitalWrite(pinSpeaker,HIGH);

        delayMicroseconds(period / 2);

        digitalWrite(pinSpeaker, LOW);

        delayMicroseconds(period / 2);

        elapsed_time += (period);

    }

}