Laser Security System

Bismillahir Rahmanir Rahim

Assalamualaikum, how are you friends. This titurial  i wanna make a simple "Laser Security System" . Its a very simple project, At first we have to know what are the components to make  this project:

Electronics components are:-

1. Buzzer
2. Light dependent resistor (LDR)
3. 1k ohm resistor
4. PNP 2N3904 transistor
5. 3 volt coin cell battery
6. Battery holder
7. Breadboard
8. Jumper wires
9. Laser light

Most of the people are don't know who are beginner about PNP 2N3904 transistor . That's why the project con't run successfully. Now introducing with PNP 2N3904 transistor .At first move your PNP 2N3904 transistor so that the Plane or flat side in-front of you. Now the middle one is Base, left one is Emitter and the right side one is collector.

 Now see the circuit

 diagram:

Now just all the components are put in your breadboard like as a circuit diagram.

In a short 

1. Emitter of PNP 2N3904 transistor and head of 1Kohm resistance are connect together. (mind it its the +3V or Voltage input point)
2. Baseof PNP 2N3904 transistor, tail of 1Kohm resistance and the GND of LDR are connect together.
3. Collector of PNP 2N3904 transistor and Positive side of  Buzzer /LED  connect together
4. Connect LDR and Buzzer/LED negative sides together. this one is GND of this circute.
5. Last job is the circuit connect with a power source ,Here we use +3V .

now put your laser ray on your LDR then buzzer sound will be off and when something comes over the Ray then buzzer make a sound.
click her to see the video demo

Best of luck

for more information mail

click here

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