How to Make IR Security Alarm & a IR Detector Using LM358

In this project i will show you how to make a IR Security Alarm and a IR Detector with the same circuit, just with little modification. For the indication we have included both Buzzer & LED.

Step 1: Parts List

***Parts List***

1. LM358

2. 7805

3. 8 Pin IC Base

4. 2 Pin Terminal Block - 2 No's

5. Female Header

6. IR Rx

7. IR Tx

8. Resistor (39 Ohm, 10K & 470 Ohm)

9. Ceramic Capacitor - 0.1uF

10. 10k Pot

11. Buzzer

12. Red LED

***Affiliate Links or Purchasing Links***

AliExpress
1. LM358 - https://goo.gl/mXHAiv

2. 7805 - https://goo.gl/GR2MiW

3. 8 Pin IC Base - https://goo.gl/AUPRRx

4. IR Rx - https://goo.gl/GndLAj

5. IR Tx - https://goo.gl/iw8yhh

6. Buzzer - https://goo.gl/FsfTf1

Amazon USA

1. LM358 - http://amzn.to/2rRBVgB

2. 7805 - http://amzn.to/2tJOtIr

3. 8 Pin IC Base - http://amzn.to/2sSoGRw

4. IR Rx & TX - http://amzn.to/2sSIRij

5. Buzzer - http://amzn.to/2rRBuDd

***Other Required Components***
AliExpress

a. Soldering Equipment - https://goo.gl/H7iwZ1

b. PCB Board - https://goo.gl/iNALh8

c. Wires - https://goo.gl/46PPgv

d. Multi-meter - https://goo.gl/MqWxbq

Amazon USA

a. Soldering Equipment - http://amzn.to/2tKboUa

b. PCB Board - http://amzn.to/2sx7bnj

c. Wires - http://amzn.to/2tp3bW1

d. Multi-meter - http://amzn.to/2rzNAkU

Step 2: Circuit Diagram

Construct the circuit as shown in the circuit diagram.

***Working***

a. Alarm OFF state : When there is continuous IR signal transmitted from the Tx circuit there will be no Light & Buzzer Indication.

b. Alarm ON state: When there is an obstacle between the the Tx & the Rx circuit blocking the IR signal only then the buzzer & LED goes to ON state.

c. You can use the pot to set the range of the LED

Note : Please use the voltage range between 4.5 to 6 volt for better performance of the circuit.

***How to test***

After completion of the circuit, power the circuit with 9 Volt battery (Since we are using 7805) & let the IR Tx & IR Rx led face each other. When they are facing each other there should not be any LED or Buzzer Indication. Now introduce any obstacle between the IR Tx & IR Rx, When the obstacle is introduced there must be Light & Buzzer indication .

***Testing***

You can watch the test results in the video attached in the first page or CLICK HERE to watch it on YouTube

Step 3: IR Detector or Remote Tester

Now let us see how to modify the previous circuit to make it a IR Detector or Remote Tester.

You can also watch the video attached in this step or continue reading to know the odification

Step 4: Modified Circuit

***Tx Part***

The Tx Circuit remains the same.

Note: For this circuit you don't need a Tx circuit, You can use any kind of remote for testing

***Rx Part***

To modify the previous circuit to detect IR, you just need to interchange the connection of Pin 2 & Pin.

a. Connect the Pin 3 to the node where Anode of IR Rx & 10k meet

b. Connect the Pin 2 to the center terminal of the 10k pot

Rest of the circuit remains the same

***Testing***

To test the circuit simply power the circuit with 9v battery & press any button on your remote. When you press a button on your remote you will get both the LED & light indication.

You can also watch the video which includes testing. The video is attached in the previous step or you can also watch it on YouTube by CLICKING HERE