In this DIY, we demonstrate a project of a “Motion Sensing Melody Alarm” project in detail. A motion sensor is a device that is likewise utilized as a sensor to identify nearby movement. Basically, this device is regularly incorporated as a part of a framework that automatically plays out an alert when somebody moves in that area. However, the circuit is easy to fabricate and utilizes not many segments.
The fundamental component of the circuit is a “PIR sensor module” that is accessible and ready-made in the market. The circuit likewise utilizes two transistors and a “UM66 tune generator IC”.
Hardware Component
The following components are required to make the Melody Alarm Circuit
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1. | IC | UM66 | 1 |
| 2. | Speaker | 8Ω | 1 |
| 3. | PIR Sensor Module | – | 1 |
| 4. | Transistor | 2N4401, BC547 | 1, 1 |
| 5. | Electrolytic Capacitor | 0.1µF | 1 |
| 6. | Resistor | 470Ω, 1K | 2, 1 |
| 7. | Zener Diode | 3V | 1 |
| 8. | Battery | 9V | 1 |
UM66 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of UM66
Melody Alarm Circuit
Working Explanation
Now, we will discuss the circuit operation of the project “motion-sensing melody alarm” in detail. However, the working of the circuit is basic. The “PIR sensor module” detects the adjustments in the body heat produced through the development of the body and at whatever point the sensor recognizes this change, its output goes high and switches ON the 2N4401 transistor because of which the melody IC become enacted and begins producing the melody. Moreover, the output of the IC is taken care of in the BC547 transistor through a 1K resistor to intensify the output of the UM66 to drive an 8 ohms speaker.
Applications and Uses
This motion-sensing melody alarm circuit can likewise be used for an assortment of indication and security purposes.
- It is likewise used to detect the person in the precluded zone.
- In the same way, it uses for some, other security purposes.
- It is also used in automatic lighting control.
- It can also be used in home control, energy efficiency, and other useful systems.
