The Metal Detector Alarm Module is a standalone metal detection board designed to detect nearby metallic objects and provide an audible alert through an onboard buzzer. Unlike sensor modules meant for microcontrollers, this module works independently and does not provide any digital or analog output pins. It is commonly used in basic security checks, educational demonstrations, and DIY projects where an audible indication of metal presence is sufficient.
Core Module Specifications
• Module Type: Standalone metal detector alarm
• Detection Principle: Electromagnetic induction
• Detection Target: Ferrous and non-ferrous metals
• Output Type: Audible buzzer only (no signal output)
Electrical & Interface
• Operating Voltage: 5 V – 12 V DC (variant dependent)
• Input Interface: Power only (VCC, GND)
• Output Indication: Onboard piezo buzzer
• Sensitivity Control: Onboard adjustable potentiometer
Performance Characteristics
• Audible alert when metal is detected
• Sensitivity adjustable using trimmer
• Short-range detection (depends on metal size and distance)
• Fast response time
Physical Characteristics
• Module Type: PCB-mounted detector board
• Sensing Element: Printed induction coil on PCB
• Alert Device: Integrated buzzer
• Mounting: PCB holes for fixed installation
Compatibility
• Standalone operation (no microcontroller required)
• Can be powered using DC adapters or batteries
• Suitable for simple alarm-based setups
Key Advantages
• Fully standalone operation
• No programming or controller needed
• Simple power-only wiring
• Immediate audible feedback
Technical Insights
• Does not provide digital or analog signal output
• Not suitable for data logging or MCU interfacing
• Detection range is limited to a few centimeters
• Sensitive to surrounding electromagnetic interference
Applications
• Simple metal detection alarms
• Security and screening demonstrations
• Educational electronics experiments
• DIY hobby projects
• Hidden metal or object presence indication
Pro Tip
• Adjust sensitivity after final mounting
• Keep away from large fixed metal objects
• Use regulated power supply for stable operation
• Test with different metal sizes for calibration
Package Includes
• 1 × Metal Detector Alarm Module (Buzzer Type)