Introduction
In your life, you may have seen many detectors that detect metallic devices. These detectors have many special applications. For instance, we can use it in the mining process. Also, to avoid any illegal activity of guns bombs, and other devices in public places. Hence with the help of this one can build a security system electronics project by using a proximity sensor. Thus, one can employ a metal detector to sense any nearby existing metal. Now, in this tutorial, we are going to make a “Simple metal detector circuit”
We use this amazing electronic device in many public places like shopping malls, markets, museums, etc for the detection of metallic objects like daggers, pistols, guns, or any hidden explosive that a person carries with bad intentions.
Hardware Components
The following components are required to make Metal Detector Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Inductive Proximity Sensor | – | 1 |
| 2. | Transistor | SL100 | 1 |
| 3. | Buzzer | 9V | 1 |
| 4. | Resistor | 100Ω | 1 |
| 5. | Battery | 9V | 1 |
SL100 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of SL100
Metal Detector Circuit
Working Explanation
This simple metal detector circuit includes an Inductive proximity sensor. The sensor has a range of metal detection from a few millimeters to centimeters. We feed an output signal from the sensor at the base of the wired transistor SL100. We Have connected the Buzzer at the collector of the switching transistor as an output device. When there is a metal across the circuit this buzzer generates the sound, otherwise, it remains silent.
Application and Uses
- Metal detector vehicles.
- In Robotics applications.
- In the mining process.
- For security purposes of malls, theatres, parks, gyms, museums, and other public places
