The KY-003 Hall Effect Magnetic Sensor Module is a compact and highly sensitive magnetic field detection module based on the A3144 Hall Effect Sensor. It detects the presence of magnetic fields without physical contact and outputs a digital signal when a magnet is brought within range. This non-contact magnetic switch is widely used in Arduino projects, ESP32 systems, Raspberry Pi applications, robotics, automation systems, motor speed measurement, position sensing, security devices, and industrial control equipment.

Using Hall Effect technology, the sensor converts magnetic field changes into a digital voltage signal. The module features fast response time, high sensitivity, excellent reliability, and stable operation, making it suitable for both educational and professional electronics projects.

Its compact design and simple three-pin interface allow quick integration with microcontrollers and embedded systems for magnetic detection and position monitoring applications.

Features:

• Original A3144 Hall Effect magnetic sensor

• Non-contact magnetic field detection

• Digital output signal

• High sensitivity magnetic sensing

• Fast response time

• Stable and reliable operation

• Compact PCB design

• Low power consumption

• High precision magnetic detection

• Built-in Hall Effect switch circuit

• Easy integration with Arduino and microcontrollers

• Excellent temperature stability

• Long operational lifespan

• Suitable for industrial and DIY projects

BDTronics supplies quality-tested sensors, Arduino modules, development boards, and electronics components for students, hobbyists, engineers, and automation professionals. The KY-003 Hall Effect Sensor Module is selected for reliable magnetic detection and seamless integration into embedded electronics projects.

Specifications:

• Model: KY-003

• Sensor Chip: A3144 Hall Effect Sensor

• Detection Type: Magnetic Field Detection

• Output Type: Digital Signal

• Operating Voltage: 3.3V – 5V DC

• Output Signal: High/Low Digital Output

• Response Time: Fast

• Interface: 3-Pin

• Sensor Technology: Hall Effect

• PCB Material: High-Quality PCB

• Operating Mode: Non-Contact Detection

• Compatibility: Arduino, ESP32, ESP8266, Raspberry Pi, STM32, AVR, PIC

How It Works:

• The A3144 Hall sensor detects magnetic fields generated by a permanent magnet.

• When a magnetic field reaches the sensor threshold, the output changes state.

• The digital output can be read directly by a microcontroller.

• The sensor functions as a non-contact switch, eliminating mechanical wear.

• Ideal for detecting movement, position, rotation, and proximity of magnetic objects.

Pin Configuration:

• GND: Ground

• VCC: 3.3V–5V Power Supply

• S: Digital Signal Output

Wiring:

• GND → Arduino GND

• VCC → Arduino 5V

• S → Arduino Digital Pin (e.g., D3)

How to Use:

• Connect VCC to 3.3V or 5V power.

• Connect GND to system ground.

• Connect S pin to a digital input pin on the microcontroller.

• Upload a digital input reading program.

• Bring a magnet close to the sensor.

• Monitor output changes through Serial Monitor, LEDs, relays, or automation logic.

• Use the detected signal to trigger events or count rotations.

Applications:

• Magnetic switch systems

• Door open/close detection

• Motor speed measurement

• RPM counters

• Smart car projects

• Position sensing

• Proximity detection

• Industrial automation

• Security systems

• Magnetic field monitoring

• Robotics projects

• Arduino learning projects

• ESP32 automation systems

• Raspberry Pi sensor projects

• Electronic counters

• Rotation detection systems

• Contactless switching applications

• Embedded electronics development

Advantages:

• Non-contact operation

• No mechanical wear

• Fast response speed

• Compact design

• High sensitivity

• Stable digital output

• Easy installation

• Reliable long-term performance

• Low power consumption

• Cost-effective magnetic sensing solution

Package Includes:

• 1 × KY-003 Hall Effect Magnetic Sensor Module (A3144)

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