Hall Sensor Alarm

i will show you how you can make a simple security alarm using hall sensor.

hall sensors is used in many field like automaotive,dc motors,cellphone magnetic flip cover. i got mine from a old dusty pc

Step 1:

PARTS

1. HALL SENSOR FROM PC FAN

2.BUZZER

3. BATTERY

4. LED'S [OPTIONAL]

5. MAGNET

Step 2:

take a pc fan apply some brute force and open it

Step 3:

inside you will get sensor these are positive and negetive pins in middile two pins are output pins

Step 4:

built a buzzer circuit (led's are optional)yellow wire will be connected to positive,two black wire will receive output and red wire is from buzzer it will be connected with one of output.

Step 5:

here is the complete circuit diagram again led's are optional for better understanding check datasheet of sensor

Step 6:

lets test the circuit when it sense a magnetic field it gets high to low and buzzer gets off

Step 7:

finally you can fix it on doors windows a very small magnetic alarm is here

thanks

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