In this tutorial, we are developing a multipurpose vibration-sensing alarm that senses vibration and sounds an alarm. The circuit is very sensitive and it can measure extremely minor vibrations, which are delivered during the movement of things. Note that it is will not work when someone touches the thing where it is placed, it only senses vibration. This is the easiest way for making this circuit and also it contains low-cost components that are easily available at your nearest electronics shop.
Hardware Components
The following components are required to make Vibration Sensing Alarm Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1. | IC | NE555 Timer | 1 |
| 2. | Transistor | 2N4401 | 2 |
| 3. | Transistor | BD139 | 1 |
| 4. | Piezo Buzzer | – | 1 |
| 5. | Alarm Siren | 100-120dB | 1 |
| 6. | Resistor | 1K, 10K, 1M | 2, 2, 2 |
| 7. | Variable Resistor | 1M, 2M | 1, 1 |
| 8. | Electrolytic Capacitor | 2.2µF, 100µF | 1, 1 |
| 9. | Ceramic Capacitor | 0.1µF | 1 |
| 10. | Battery | 6V-12V | 1 |
NE555 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of NE555
Vibration Sensing Alarm Circuit
Working Explanation
In this section, we are discussing the circuit operation of the Multipurpose Vibration Sensing Alarm. For detecting vibrations, we have utilized a piezo buzzer in the circuit, the sensitivity of the circuit can be balanced with the 1M variable resistors. The transistors Q1 and Q2 are utilized to intensify the vibration signals got from the piezo sensor. The 555 IC is utilized to make a short period delay for the loud alarm siren. This time delay can be balanced with the 2M variable resistors. The time delay likewise relies upon the estimation of the 100µF capacitor, utilizing a higher-worth capacitor will extend the time delay. For best execution join the piezo part on the outside of the things to guard.
Applications and Uses
This multipurpose vibration sensing alarm can be utilized for many purposes for indoor and outdoor applications.
- Indoor, it can be used on windows and doors to warn you with a loud siren/alarm when some unauthorized individual is attempting to open your door or window.
- Outdoor, you can utilize it with your bicycle, motorcycle, or different things, which you have set outside of your home.
