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Hey guys, welcome back, In the previous post, I told you how an IR sensor works, how to make a line follower using an IR sensor and to make a Simple DIY Burglar Alarm using an IR sensor and a Buzzer without using any micro controller or complicated coding. In this Post, I will show you how to make a Lightweight DIY Burglar Alarm using PIR sensor without any Micro controller.
To set this up, All you need is
- PIR sensor
- Buzzer
- Header Pins
- 9-12 Volt Power Adapter
A PIR sensor is a tiny circuit that can detect human being moving around infront of it with in a range of range is between 4 Meter and 13 Meter.
PIR sensors are small, compact, and need minimal effort to set up with any project. They also have a wide lens range, and are very easy to interface with.
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PIR Sensor PinoutThere are mainly 3 pins to PIR Sensor -
- VCC - Where we connect 5 V Power Supply
- Out - Output Voltage (5V when it detects human IR Signature)
- GND - Where we connect -ve Terminal
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DIY Burglar AlarmSo Now you know how a PIR sensor works. We will start building our Burglar alarm. This project is very simple. You wont need more than 1 minute to set this up. This is how we set up the entire circuit.
Connections - Burglar Alarm CircuitThe CircuitThis is a simple circuit comprising of a PIR Sensor and LM358 as a comparator circuit.
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The input power is connected to a 7805 regulator. 7805 is a 5V regulator which will convert an input voltage of 7- 32V to a steady 5V DC supply. So, you can connect an input voltage of anywhere between 7V to 32 to this circuit. For my bot, I prefer a 11.1V Lipo Battery. There are indicator LEDs across various points for easy troubleshooting.
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You can now download the Gerber file and use it to manufacture your PCB from JLCPCB. Gerber File contains information about your PCB such as PCB layout information, Layer information, spacing information, tracks to name a few. BOM File or Bill Of Material contains the list of all components in the Layout. CPL file(Component Placement List / Pick & Place File (PNP) file), it is used by automated SMT Assembly machines to determine where each part should be located on the board.
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Now, you will have to upload the BOM and CPL file that we downloaded earlier. Select all the components you want JLCPCB to assemble in your PCB. Simply click on the confirm box to select the components.
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The PCB will be manufactured and shipped within days and will be delivered to your doorstep within the mentioned time period.
Once you get the PCB in hand, all you have to do is solder the header pins and connect the PIR Sensor.
Once it is done, connect the power adapter and you will see LED1 will glow up. This means it is working. Now you can use a jumper to shot both the terminals of the 'Speaker' which will close the circuit to the speaker (refer the circuit above). You will see the LED starts to glow and the buzzer will starts to beep for some time.
Now you can fix this somewhere in your room. When someone enters the room, it will starts to beep.
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