PIR Sensor Arduino Alarm

128 Responses to PIR Sensor Arduino Alarm

1. Goli Mohammadi on May 18th, 2011 at 5:39 pm said:

   It’s a PDF under Files at the top of the project. Have fun!

   • sanderny on March 11th, 2013 at 1:15 pm said:

     If you have the code then send me on this address email “mf93@live.it” please!!

     • Goli Mohammadi on June 10th, 2013 at 11:32 am said:

       The code is here: https://raw.github.com/jedgarpark/Make_PIR_Sensor/master/MAKE_PIR_Sensor.pde
   • Ethan Loewen on March 27th, 2013 at 3:27 pm said:

     where is the code. Plz HURRY

     • Mr.MIx on March 27th, 2013 at 5:50 pm said:

       For Real

       • Mr.MIx on March 27th, 2013 at 5:51 pm said:

         i tried downloading the sketch and its no where to be found…anyone know. this is probably something simple, right? yea whatever….

         • Goli Mohammadi on June 10th, 2013 at 11:33 am said:

           The code is here: https://raw.github.com/jedgarpark/Make_PIR_Sensor/master/MAKE_PIR_Sensor.pde
2. John Edgar Park on November 24th, 2011 at 8:13 pm said:

   Brandon, sorry for the huge delay, I didn’t see your comment until now. You can change the delay time upon startup to be longer if you need. Try adding a new line as the first one in the void setup that reads: delay(5000);
   That’ll give you five seconds before it begins.
3. Jeremy dePrisco on January 19th, 2013 at 3:00 am said:

   I noticed when I took the code from the PDF, the formatting was off when it is copy/pasted into Arduino editor. Best to download the PDE which is on the right side of the page above.
4. Nikko Canlas on March 9th, 2013 at 11:27 am said:

   Hi! Nice project! wanna try it too.. but the thing is, I don’t know where to download the code.. I can’t find it….. :(

   • Goli Mohammadi on June 10th, 2013 at 11:34 am said:

     The code is here: https://raw.github.com/jedgarpark/Make_PIR_Sensor/master/MAKE_PIR_Sensor.pde
5. eder on March 9th, 2013 at 3:24 pm said:

   “Were Is The Code I Can’t Find It”?
6. John Edgar Park on March 9th, 2013 at 11:22 pm said:

   Sorry about that, we’re looking into what happened. It seems when the new formatting was introduced the code was no longer included.
7. louis 0208 on March 12th, 2013 at 9:21 am said:

   Hi, nice project, im looking to do an attack sensor so its very similar to this, my components are fairly simialar, just wanted to know will they work if swtiched with the ones in the project youve used, im using a vibrations motor as the output, and a sharp PIR sensor for the input, any help or advice will be great and really appreciated.
8. Robert on March 13th, 2013 at 7:18 am said:

   Hello, please send me the program?
   e-mail: robert-1406@hotmail.com
9. Blake on March 14th, 2013 at 9:20 pm said:

   The Sketch seems to have been removed from the page. Does anyone know where? I even did a search for “pdf” in the source code of this page without a result (sorry Goli Mohammadi).

   • Goli Mohammadi on June 10th, 2013 at 11:35 am said:

     The code is here: https://raw.github.com/jedgarpark/Make_PIR_Sensor/master/MAKE_PIR_Sensor.pde
10. Ivan on March 15th, 2013 at 6:42 am said:

    Is there code for this yet?

    • Goli Mohammadi on June 10th, 2013 at 11:36 am said:

      The code is here: https://raw.github.com/jedgarpark/Make_PIR_Sensor/master/MAKE_PIR_Sensor.pde
11. Blake on March 15th, 2013 at 7:27 am said:

    I found the code here: http://make-documents.s3.amazonaws.com/fv1fYSLfy6QRgANM.pdf
12. Elany on March 22nd, 2013 at 6:40 am said:

    Hello, send me the code? Please.
    elany7@gmail.com
13. Mr.MIx on March 27th, 2013 at 5:47 pm said:

    cant download this pir sensor sketch, whats the deal? someone let me know just how much of an idiot iam?
14. John Edgar Park on March 27th, 2013 at 7:51 pm said:

    Sorry for the delay in fixing the post. Here is the code, I’ll see about having it properly added to the project next.

    // Uses a PIR sensor to detect movement, buzzes a buzzer
    // more info here: http://blog.makezine.com/projects/pir-sensor-arduino-alarm/
    // email me, John Park, at jp@jpixl.net
    // based upon:
    // PIR sensor tester by Limor Fried of Adafruit
    // tone code by michael@thegrebs.com

    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)

    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 of
    Serial.println(“Motion ended!”);
    // We only want to print on the output change, not state
    pirState = LOW;
    }
    }
    }
    // duration in mSecs, 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);
    }
    }
15. JesstheBess on March 30th, 2013 at 5:07 pm said:

    Would it be possible to just run this off a battery?

    • John Edgar Park on May 13th, 2013 at 10:28 pm said:

      Yes, you could run this off of batteries. I’ve done so and it works fine. I usually use 4 AA NiMH batteries.
16. Arjun patel on April 5th, 2013 at 8:02 am said:

    can you give me pir for 8051 controller
17. Dave on April 19th, 2013 at 6:30 am said:

    Thanks this is simple and neat. My nine year old son wanted to “invent” a device that scared off the birds under our deck so they didn’t make nests. So we used these plans. Going to try an add a camera to snap pics of it scaring off birds. Though knowing these birds they’ll just make a nest on top of it.

    • John Edgar Park on May 13th, 2013 at 10:28 pm said:

      Excellent, did you and your son build the Duck Alarm?
18. Ayupchap on May 13th, 2013 at 5:03 pm said:

    Hi, I seem to have trouble running the code it says “Cannot find anything named LOW” I have copied the code over, any idea what might be wrong?

    • Ayupchap on May 13th, 2013 at 5:38 pm said:

      Scrap that, I worked out whats wrong. Essentially I am an idiot, I had opened the code up in Processing and not Arduino. Can someone tell me how to add a Camera to take photos to this please?

      • John Edgar Park on May 13th, 2013 at 10:32 pm said:

        One straightforward way would be to use a camera that has an input for a remote switch, and have the Arduino close that for you with a transistor or relay. I made my own release switch: http://blog.makezine.com/2010/11/10/john-edgar-park-has-a-trigger-mouth/ using a 2.5mm phone earbud, you’d trigger it with the Arduino instead of the arcade button.
19. TommyTDesign on May 17th, 2013 at 6:35 am said:

    Great project!

    I was wondering if anyone could help me tweak the arduino sketch?

    What code could I insert to make it so that there is a 3 second delay between the PIR receiving a signal and the outputs?

    • Brian on May 27th, 2013 at 10:32 am said:

      There are other ways to make a delay, but the block of code using the Timer library allows for other actions to take place by using pulses to define your time-domain. If you use a Delay function that locks up the MCU until the delay is completed. You can find details at: http://playground.arduino.cc/Code/Timer
20. Vidhi Shah on May 27th, 2013 at 8:49 pm said:

    Hey, is there a way to attach a servo instead? And what changes should be made to the code for that?
21. metamorp on June 2nd, 2013 at 12:08 am said:

    what code if i use pir and keypad,
    keypad for on/of that sensor
22. Ted on June 15th, 2013 at 2:18 pm said:

    My LED on pin 13 wont turn on, the PIR works fine, the only difference is I’m using a Duemilanove, any ideas.
23. Blake on June 21st, 2013 at 6:53 pm said:

    This was a fun build to learn a little about the motion sensor. However, it is just not loud enough to keep the dogs from getting up on the table. :-(

    What I need is a simple circuit to boost the output signal to drive one of the Radio Shack sirens (9-12 volt). Or a modification that turns the output into a simple switch to turn on a separately powered 9 volt circuit connected to the siren.

    I have tried a couple of ideas from Hack a Week and Instructables but no success yet. How about a little help?
24. Ronaldo Panaligan on June 30th, 2013 at 9:54 am said:

    It may not Compile, the only error is you may have to retype the this character (“motion detected”) and (“motion ended”). It has to do with the way these character shows up on the internet. Thanks I’m going to try it now.
25. Alex on August 26th, 2013 at 4:44 pm said:

    Do you have the Electrical Schematic for this configuration?
26. Julius Edward Asuncion on September 18th, 2013 at 7:08 am said:

    GOOD DAY SIR i use RE200B pir sensor and the buzzer and the led is blingking and the buzzer is continuesly sounds up ….. is there a problem if i dont use the kind of pir that you use sir > ? help me please ..

    are RE200B AND YOUR PIR SENSOR THE SAME ?
27. Sandy on October 22nd, 2013 at 2:14 am said:

    Sir I want Source code in ASM Language will you please help me.
28. Zoey on October 22nd, 2013 at 11:07 pm said:

    Hi..do you have block diagram for this project?
29. Ben on October 28th, 2013 at 5:33 am said:

    Hi nice post!
    I’m looking for a PIR sensor that its delay time is less than 5 seconds.
    Do you know one that can answer my needs?
    Thanks
    Ben
30. priyanka saini on October 31st, 2013 at 12:20 pm said:

    hie nice project… i need arduino software… pls give me dat site

    • priyanka saini on October 31st, 2013 at 12:28 pm said:

      i juz got :)
31. Dombo on November 16th, 2013 at 4:19 pm said:

    Great tutoriol….!!!!!!
    I have search the web for asolution to switch with a pir my bedledlight on and off. And this great.
    Can you please tell me how i can change the buzzer code in to a ction to open the mosfet…
    Or a signal where the powerr on is for x seconds,please..

    Or can i set the mosfet to pin 13?
32. HuDa Affandi on November 22nd, 2013 at 1:27 am said:

    sorry..how if i want when the PIR sensor detect the motion,then it will send the message via old cellphone to another cellphone to tell that the motion is detected..
33. alex on November 22nd, 2013 at 9:16 am said:

    How can you change the duration of the buzzer?

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35. mlemos on November 22nd, 2013 at 5:12 pm said:

    Hi, I’m writing a blog post about cool Arduino based projects and your’s is going to be there. Do you allow me to use one or two of your pictures in the post? I’m linking the references to the project back to this page.

    Thanks in advance!

    Manoel Lemos

    • Dombo on November 23rd, 2013 at 3:36 pm said:

      Please some one make my day….
      My Pir A is working only Pir B not.
      Where do i go wrong…

      [code]// Twee pirren onder het bed…
      // Pir A en Pir B
      //Pir B werkt niet…

      int ledPin = 12; // choose the pin for the LED
      int inputPin = 2; // choose the input pin (for PIR sensor)
      int inputPinB = 3; // PIRB
      int pirState = LOW; // we start, assuming no motion detected
      int pirStateB = LOW; // PIR B
      int val = 1; // variable for reading the pin status
      int valB = 1; // PIR B
      void setup() {
      pinMode(ledPin, OUTPUT); // declare LED as output
      pinMode(inputPin, INPUT); // declare sensor as input
      pinMode(inputPinB, INPUT); // PIr B
      Serial.begin(9600);
      }
      //////////////// PIR A
      void loop(){
      val = digitalRead(inputPin); // read input value
      if (val == LOW) { // Zorgt dat hij de goed "richting"op gaat High is de pir anders om
      digitalWrite(ledPin, HIGH); // turn LED ON
      delay(100); // uitlezen van ?
      ////////////////
      if (pirState == HIGH) { //
      Serial.println("Motion detected!"); //
      pirState = LOW;
      delay(100); // weet niet maar zal iets met uitlezen zijn.
      ///////////////////////////
      }
      } else { digitalWrite(ledPin, LOW); //

      if (pirState == LOW){ // we have just turned of
      Serial.println("Motion ended!"); //
      pirState = HIGH;
      delay(10000); // Tijd lamp aan is
      }
      }
      }
      /////////////////////

      //}
      ////////////////PIR B
      void loopB(){
      valB = digitalRead(inputPinB); // read input value
      if (valB == LOW) { // Zorgt dat hij de goed "richting"op gaat High is de pir anders om
      digitalWrite(ledPin, HIGH); // turn LED ON
      delay(100); // uitlezen van ?
      ////////////////
      if (pirStateB == HIGH) { //
      Serial.println("Motion detected!"); //
      pirStateB = LOW;
      delay(100); // weet niet maar zal iets met uitlezen zijn.
      ///////////////////////////
      }
      } else { digitalWrite(ledPin, LOW); //

      if (pirStateB == LOW){ // we have just turned of
      Serial.println("Motion ended!"); //
      pirStateB = HIGH;
      delay(10000); // Tijd lamp aan is
      }
      }
      }
      [/code]

      So please…
      Whe you have time…

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39. Ben on May 10th, 2014 at 9:35 am said:

    How do I reduce the length of time it buzzes?

    • troll on October 28th, 2014 at 1:01 am said:

      reduce time delay after it triggers the buzzer

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41. Mohammed on May 11th, 2014 at 4:25 am said:

    Hi, I am using a different sensor, which has 3 wires (Red,white, Black). Red is Marked as +ve and and black is marked as “AL”. Kindly let me know which OUT wire and negetive wire..

    • fraggie on November 19th, 2014 at 11:40 am said:

      Out is probably white , as red and black is mostly used for plus and minus voltage input..
42. MySensors on May 23rd, 2014 at 1:44 am said:

    You can also make the motion sensor wireless by following our guide here:

    http://www.mysensors.org/build/motion

    Cheers
    Henrik
43. ToxicT on June 7th, 2014 at 7:22 am said:

    Cool! I used this code to make an alarm for my sneaky 3-yo who started getting up in the middle of the night (very stealthy). I tested it last night and sure thing it worked great! I’ll include some pics.

    • sri on September 17th, 2014 at 8:52 pm said:

      Hello,
      Is it possible to trigger the PIR only if a person is standing for more than 10 Secs, this is to avoid triggering for passersby. If so kindly share how this can be achieved.

      Thanks
      Sri

      • ToxicT on September 18th, 2014 at 12:23 am said:

        I’m not an expert on this but you should look into “retriggering” and “non-retriggering” mode. I think using your PIR-sensor in “retriggering” mode (with the jumper on the back set to H) is the way to go. Then you can probably monitor the time the sensor is on an in software and set you threshold there. I.e when the sensor triggers, wait 10 seconds before doing anything.

        I found this instructable that explains this in more detail.
        http://www.instructables.com/id/PIR-Motion-Sensor-Tutorial/step5/Retriggering/
      • troll on October 28th, 2014 at 12:58 am said:

        when it receives a signal, add a delay for 10 seconds then if there’s still a signal set off the alarm.
44. Guest on June 7th, 2014 at 7:23 am said:

    Pic2
45. ToxicT on June 7th, 2014 at 7:25 am said:

    Pic 2 (of insides)

    • Mohammad Asim Siddiqui on November 6th, 2014 at 12:35 pm said:

      Is it working 100%because I have the same PIR sensor and buzzer that u got , like in my PIR sensor there is not written which pin is of GND, VCC and Vout
      plz helpme bcoz my circuit is constantly ring alarm.
46. Ali Pour on June 16th, 2014 at 8:11 am said:

    Hi, can I use one of the components like the one in this page:
    http://uk.rs-online.com/web/p/ir-receivers/0577897/

    to build this circuit. It is just that I dont know the difference between IR receivers and PIR.

    thanks
    ali.

    • Kerry Trantham on August 3rd, 2014 at 2:38 am said:

      The difference is PIR sensor Senses Infrared Light, IR reciever looks for Infrared pulsed signals, such as TV B GONE OR TV REMOTES I do believe

      • troll on October 28th, 2014 at 1:01 am said:

        almost, pir senses body-emitted infra red or (rarely) heat but ir reciever takes any ambient light (not only signals)
47. Eduard on June 23rd, 2014 at 12:43 pm said:

    Very nice project. In a few minutes I was able to test a PIR sensor I received today.
48. Stephen on September 13th, 2014 at 7:37 am said:

    Hi guys, my alarm rings constantly as soon as I upload the sketch. Any thoughts on what the issue could be?

    • troll on October 28th, 2014 at 12:59 am said:

      maybe a short circuit, or wrong polarity
    • Mohammad Asim Siddiqui on November 6th, 2014 at 12:31 pm said:

      Hey Stephen what happened , Is ur circuit working? now? I mean do you still have a problem of constantly buzzing of the buzzer??
49. Mohammad Asim Siddiqui on November 1st, 2014 at 5:40 am said:

    where is PIR sensor in proteus?
50. Mohammad Asim Siddiqui on November 1st, 2014 at 5:43 am said:

    what is the range of this PIR sensor?

    • Pradeep on November 2nd, 2014 at 5:01 am said:

      Up to 20 feet(6 meters)

      • Mohammad Asim Siddiqui on November 3rd, 2014 at 8:56 am said:

        thanx Pradeep
51. Nilesh on November 4th, 2014 at 3:42 am said:

    Hi,
    Thanks for the wonderful tutorial on using PIR sensors. Works like charm! However, I ran into a minor issue with this. It works all perfect when I have my Arduino connected using the USB cable via my laptop. However, whenever I connect this using a 9v battery, the buzzer starts buzzing and doesn’t stop. I suspect I’m not using the right kind of battery. Using a USB cable, it works perfectly.

    Any idea on how this can be fixed?
52. Mohammad Asim Siddiqui on November 8th, 2014 at 4:33 pm said:

    Hey my circuit is constantly ringing alarm plz help me??
53. Mohammad Asim Siddiqui on November 10th, 2014 at 11:09 am said:

    Now it’s working because I have tested it by varying two potentio meters in PIR sensor
54. Mohammad Asim Siddiqui on November 11th, 2014 at 11:19 pm said:

    How can we increase the volume of speaker?

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57. waheed on November 24th, 2014 at 11:24 am said:

    how we can control the working temerature of pir sensors eg.my project is that detect the moving body whos temerature is above then 40 degree c. plz help me
58. Nidhish Lakhinana on November 29th, 2014 at 8:06 pm said:

    can you make the same project without using a pc or a laptop
59. Christian Duke Pasiona Tugay on December 10th, 2014 at 10:19 pm said:

    Sir I would like to say my gratitude to you and to your helpful work. I follow the instruction carefully and it was successful. But the difference is the sensor I used is a vibration sensor (SW-420). But it just work perfectly fine. anyway Sir, thank you for the reference you made. More Power. God Bless.

    • Kevin on January 8th, 2015 at 7:53 am said:

      Can you tell me what you used for output voltage on the SW-420 to operate the buzzer?
      My understanding is the output is a digital signal.
      Thanks for any help you can offer.

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61. Tom Garty on January 15th, 2015 at 12:07 pm said:

    made this but i have no idea of c sharp/arduino encoding and i am making it for my cat’s to trigger when they jump on the counter so i want it to triger once every time but the way it’s encoded it seems that it beeps like a car alarm and does not stop… what to do?
    and by the way: great work here and great thinking so thank you thery much!
62. bisry on March 4th, 2015 at 7:59 am said:

    how to limit the range of pir sensor because i need to use the sensor in short range around 1 meter.

    • Altoidian on July 20th, 2015 at 10:07 am said:

      You can install a small tube of paper around the sensor head, in effect, narrowing the field of view. Imagine looking at the world through a straw. I used a section of tubre cut from the inside tube from an old roll of waxed paper. A toilett paper roll tube would also do. Re-aim the senor to take in only a portion of the area in which you expect movement. You can also re-adjust the opening of the paper tube with masking take to reduce the area even more. You will have to experiment a bit to get jsut what you are needing for your project.

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64. Greasy Bus on March 19th, 2015 at 5:57 pm said:

    I am attempting to add a reed switch to this design. Where in the code would I add the coding for this in and what would it look like?

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72. aaron on June 3rd, 2015 at 7:53 pm said:

    can someone tell me why the program is saying error compiling!!??

    • Arup Kumar Maitra on January 25th, 2016 at 7:47 pm said:

      check if the right serial port is pointing for your ardunio and select your right arduino model from arduino software.

      Thanks,
      Arup
73. abhay on July 4th, 2015 at 7:32 am said:

    hi my name is abhay

    i work with an intel galileo

    when i uploaded the code to it it is just glowing the led it is not responding at all

    please help

    the code is

    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)

    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

    pirState = LOW;

    }

    }

    }

    // duration in mSecs, 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);

    }

    }

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76. Slothensen on August 13th, 2015 at 5:26 am said:

    How could you power this with a battery?
77. Girish Vijay Damle on August 18th, 2015 at 9:01 pm said:

    can pir generate output as heat map and the signal could be accessible on your android by entering the ip?
78. annedi shanthan on September 13th, 2015 at 2:52 pm said:

    Hey my circuit is constantly ringing alarm plz help me??

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82. Yash Thaker on February 17th, 2016 at 5:58 am said:

    How to set the optimum sensitivity to get accurate results.
83. Yash Thaker on February 18th, 2016 at 8:37 am said:

    My PIR sensor is continuous on even setting it to lowest sensitivity.
84. soham on April 23rd, 2016 at 8:06 am said:

    Hi i am using Arduino UNO. But One problem create for passing value HIGH and LOW not completely Working it is automatically detected.
85. prashanth yella on April 28th, 2016 at 10:18 pm said:

    what type of PIR sensor used……?

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87. Anonymous on September 1st, 2016 at 3:36 am said:

    I’m very much a beginner. Where would you get these components in the UK?

    • steve shiflett on September 23rd, 2016 at 8:53 am said:

      You got Ebay in the UK? Get the stuff from China
88. Kwaku Sarpong Manu on October 28th, 2016 at 6:59 pm said:

    Thanks so much John. Just got this kit yesterday without knowing what to do. I googled and found you. Turns out code runs perfectly too! Kudos and keep up the good work.
89. Faheem Sattar on February 3rd, 2017 at 10:29 am said:

    Hi, I have used the exact same code and connected it accordingly and my buzzer is ringing constantly. Plaese could you identify the issue here.

    Code is

    // Uses a PIR sensor to detect movement, buzzes a buzzer

    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)

    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
    pirState = LOW;
    }
    }
    }
    // duration in mSecs, 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);
    }
    }

    • Daniil Kharlashko on February 21st, 2018 at 7:22 am said:

      I have the same issue could you help me?

90. Pingback: 200+ Arduino Projects List for Final Year Students- Engineering Solutions

91. Brugumalla Karthik on October 17th, 2017 at 3:58 am said:

    can i get the circuit diagram for this project
92. Hemant Singh Bohra on October 27th, 2017 at 10:22 pm said:

    give me full code
93. Rovel Grace Rubio on March 5th, 2018 at 5:01 am said:

    can i use gizduino as an alternative? and also there is something wrong with the codes
94. Итгэлт Ги on April 29th, 2018 at 9:12 am said:

    my buzzer doesnt working pls help me??????
95. gfgwg on February 1st, 2020 at 11:34 pm said:

    woah

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