Introduction: Laser Maze Security System

Picture of Laser Maze Security System
This is an Instructable that tells you how to make a laser tripwire or laser maze, just like in the movies!

All you need:

* Arduino 
* Buzzer/alarm/Led
* Led (optional)
* 1 resistor (any value)
* 1 LDR
* Laser pen
* A box to house the entire set up.
* Some tape

See it in Action:

http://www.youtube.com/watch?v=74KYPlzEGqc


http://www.youtube.com/watch?v=56aGdz3GAW0

Step 1: Step 1

Picture of Step 1

*  Attach the resistor to A0 and Gnd pins.
* Attach LDR to A0 and 5 V pins.
* Place an LED with longer side in pin 7 and shorter side in pin 6.
* Also place the buzzer with longer side in pin 11 and shorter side in Gnd pin.

Step 2: Step 3:

Picture of Step 3:

*Place the contraption in the box (to make it look neat as well as keep it hidden )

*Upload the following program on arduino:

///PROGRAM STARTS FROM BELOW

int sensorPin = A0;  
int sensorValue = 0;
int buzzPin=11;

void setup() {
    pinMode(buzzPin, OUTPUT);
  pinMode(sensorPin, INPUT);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  digitalWrite(7,HIGH);
  digitalWrite(6,LOW);
  delay(5000);
  digitalWrite(7,LOW);
}

void loop() {

  sensorValue = analogRead(sensorPin);   
if(sensorValue<=500)
{digitalWrite(buzzPin, HIGH);
delay(3000);}
else
{digitalWrite(buzzPin, LOW);}
sensorValue=1000;
}



*Now tape the button on the laser to keep it on.
*Finally place the laser away from the box and make sure that its light is concentrated on the LDR.

Step 3: FINALLY!!

Picture of FINALLY!!

POWER UP AND ENJOY!!

You can add mirrors to form a maze by reflecting the laser light. 
You can also place this in front of a door or window and it will act like an alarm if the door or window opens.
It can also be placed across the ends of a room and be used as a motion sensor

To actually see the laser light ( like in the photo) all you have to do is shroud the room in smoke. The laser light can be seen in smoke.
 If you liked this Instructable, please follow me and view my other instructables.

Feel free to ask any doubts and please give me feedback and other suggestions.

Thank you.

Comments

phoenix708 (author)2016-10-29

I am trying to use your idea for one of our escape rooms. the code verifies. The led lights up, and then goes off. I am using a red gun laser for testing purposes. When I break the beam nothing happens. I have tried changing the sensor variables but it still doesn't work. I have also tried 2 different photo cells. Is there a way to see if the Arduino is getting input from the photocell? Any help is appreciated.

Steve

prabhavguddati (author)2016-05-02

i am making it

isha_0305 (author)2015-03-09

do you have to use any specific arduino?

prabhavguddati (author)isha_03052016-05-02

a uno is more convineint

Kamruzzaman (author)isha_03052016-01-20

uno or mega any one

RishabhS26 (author)2015-12-22

what if i want to add a 12v buzzer

???? pplz help

RishabhS26 (author)2015-12-22

what if i want to add a 12v buzzer

???? pplz help

RishabhS26 (author)2015-12-22

please please please tell me please that why have you written 'resister(any value)'........I am getting confused , why 'ANY VALUE' ? ??????? ? ? ? ? ?

sandeepnelavala (author)2015-10-07

what power of laser should i us so that they can see the laser path also

skulljo (author)2015-02-07

I will try to make it to dude

skulljo (author)2015-02-07

I will try to make it to dude

skulljo (author)2015-02-07

I will try to make it to dude

skulljo (author)2015-02-07

I will try to make it to dude

skulljo (author)2015-02-07

I will try to make it to dude

skulljo (author)2015-02-07

I will try to make it to dude

skulljo (author)2015-02-07

I will try to make it to dude

skulljo (author)2015-02-07

I will try to make it to dude

ehadiddiansyah (author)2013-10-16

i have tried but i failed
buzzer cant beeping and LDR cant response laser
what should i do?

CharanC (author)ehadiddiansyah2014-12-17

Make sure that all the connections are correct.If so use a 10K resistor which will help you give better results..I think this helped.

crazyhippie420 (author)2013-07-26

if one were to rig this so that it send a signal back to the program when tripped, instead of sounding a buzzer or turning on a light, how would one change the programming to do other things, such as turn on a webcam? or play back a certain audio file. I am not very familiar with arduino, maybe you know of a manual i could read to learn this?

sidgupta (author)crazyhippie4202013-07-27

I don't know that much about these things myself but i found an Instructable that might help you:

https://www.instructables.com/id/Twittering-Laser-Tripwire-with-Webcam-Capture/?ALLSTEPS

brodylittle011 (author)2013-06-11

why did you change the sensor value to 1000 at the end?

sidgupta (author)brodylittle0112013-06-13

Good Observation,
Actually, you do not need that part. I had put that line while troubleshooting the code and checking the sensor values to make sure that the ldr was not loose. , and it looks like i forgot to remove it! Thanks for asking.

us241098 (author)2013-06-01

Thanks bro !! I decreased the sensor value and it worked .... My laser was less powerful ..... I also removed dat led code it was creating problem ..... And BTW ur laser security was simplest and best on instructables keep it up bro!! U on fb ... I am new on arduino aged 14 would u help me !! :)

us241098 (author)2013-05-31

Does it really work .. I mean I made it but its alarm automatically turns on in 5 sec whether light is concentrated or not ... Plzz help man. I really want to make it

sidgupta (author)us2410982013-05-31

Hi,
Change to if(sensorValue<=300). Hopefully it should work
Can you put up some pictures( it will be easier for me to diagnose the problem), but chances are that the problem lies with the laser. The buzzer will make noise when the laser is not concentrated. Try to use a stronger laser or a bigger LDR. If the LDR does not work then you will have the same problem so make sure the LDR works.. If you dont want to, try to change the program. Actually use the serial library of arduino to check the values of your LDR in the light of the laser and in the dark. You can then change the if(sensorValue=..)to a value below what it is in the laser and above what it is in the dark. Also see if it works a the dark environment. To use serial library:
In void setup type:
serial.begin(9600);
in void loop() type:(after the sensorValue=analogRead(sensorPin));
serial.println(sensorValue);

After this go to tools and click on serial monitor
see the nos. when the laser is pointing at the LDR and when it is not.
If you get one continuous value that does not change much when the laser if switched off then the LDR is not working.

us241098 (author)2013-05-31

Does it really work .. I mean I made it but its alarm automatically turns on in 5 sec whether light is concentrated or not ... Plzz help man. I really want to make it

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Bio: Love simple robotics, electronics, sensors, arduino projects and generally building, modifying and opening up stuff
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