Metal Detector Sensor Module

Overview

A Metal Detector Sensor Module is an electronic device used to detect the presence of metal objects without physical contact.

Commonly used in:

• Robotics

• Security systems

• Industrial automation

• DIY Arduino projects

Working Principle

Most modules work using electromagnetic induction:

• A coil generates a magnetic field

• When metal comes nearby field gets disturbed

• This change is detected and converted into a signal

Some modules use:

• Inductive sensing (coil-based)

• Magnetometer (magnetic field change)

Typical detection range: 1 cm 10 cm

METAL DETECTOR MODULE Detects: Metal objects Voltage: 3V 9V Range: 110 cm Output: Digital / TTL Type: Inductive / Magnetic Alert: LED / Buzzer

Pin Configuration (Typical)

Metal Sensor VCC 35V/9V GND Ground DO Digital AO Analog*

(*Analog pin available in some modules)

Key Specifications

• Operating Voltage: 3V 9V

• Detection Distance: 110 cm (short range)

• Output: Digital (HIGH/LOW), sometimes analog

• Indicators: LED / Buzzer (in some modules)

• Core Components: Coil, oscillator circuit, comparator

Key Features

• Non-contact metal detection

• Fast response

• Easy to interface with microcontrollers

• Low-cost modules available

• Adjustable sensitivity (in some versions)

Applications

• Security scanners

• Obstacle detection in robots

• Metal sorting in industries

• Treasure hunting (basic level)

• Object counting systems

• Educational electronics projects

  Raspberry Pi

Digital output detect presence of metal Analog output measure intensity (advanced modules)

Limitations

• Very short detection range

• Affected by metal size & type

• Not suitable for deep underground detection

• Sensitive to electromagnetic noise

Metal Detector vs Proximity Sensor

Pro Tip

Use Arduino interrupts for fast detection

Calibrate sensitivity using potentiometer