Sometimes we need to use a burglar alarm for our home security. Here is a circuit for electronic hobbyist for making own electronic home security system using a hall sensor & magnet.
Use of this electronic home security system
It can be used on door, window, storage door or wardrobes.
How does works this home security system
When this device is turned on & anyone trying to open the door then alarm will go on. Here you can choose an alarm tone from 3 different siren tones. This circuit is based on a ROM ic Um 3561. This ic can generate 4 different siren tones.
Another project with ROM IC UM 66
Here we are using a hall sensor which can detect the magnetic field.
When you keep a small magnet near the hall sensor then the siren goes off but if the hall sensor does not get any magnet near it then the alarm ringing repeatedly.
You need to make
All the components used in this project are ordered from quartzcomponents.com.
They can deliver components all over India.
At quartzcomponents.com , you can find all good quality components & parts at a low price. All components links are below.
Parts List –
| IC 3561 – BUY | ||
| Transistor 2N2222 – BUY | ||
| Transistor Bc 548B – BUY | ||
| Hall sensor A3144 – BUY | ||
| Small magnet – BUY | ||
| 8 pin ic base – BUY | ||
| Resistor 10k 2pcs – BUY | ||
| Resistor 470K – BUY | ||
| Resistor 330 ohms – BUY | ||
| 3.3v zener diode – BUY | ||
| Switch – BUY | ||
| 100 UF Capacitor – BUY | ||
| 9v battery – BUY | ||
| Dotted perfboard– BUY | ||
| Speaker– BUY | ||
| Male header– BUY | ||
| Female header– BUY |
How does this circuit working
This circuit mainly based on Rom IC UM3561 siren sound generator & A3144 hall effect sensor.
The hall sensor giving a single on bc548b transistor base when it not detecting any magnetic field.
The 548 b transistor turn on the
Ic by giving positive voltage on ic pin 5 which is VCC of ic 3561
The 2N 2222 transistor used as an audio amplifier
We are using 3 male header pins for selecting a tone of the siren. this ic can generate 4 different siren tone but in this circuit, we are using 3 tones.
Tone selection
Tone selection pin of the ic is pin 1 & 6
We are connecting
ic pin 5 (+) & 1,
Ic pin 5 (+) & 6,
Open all pins for 3 different tons.
You can use a 2 pole 3-way switch instead of the header pins
Circuit diagram of a burglar alarm
Here I prepared a practical connection diagram for better understand
