KY-003 Hall Effect Magnetic Sensor Module — High Sensitivity, 4.5–24V, Arduino (20-Pack)

KY-003 Hall Effect Magnetic Sensor Module — High Sensitivity, 4.5–24V (20-Pack)

The KY-003 Hall effect sensor module detects the presence of a magnetic field without physical contact. When a magnet approaches the sensor, the digital output switches state — enabling non-contact position detection, speed measurement, and proximity switching. Built-in temperature compensation maintains consistent performance from -40°C to 150°C. Pack of 20 for multi-sensor projects or prototyping stock.

Electrical Specifications

• Sensor Type: Unipolar Hall effect switch
• Operating Voltage: 4.5V – 24V
• Output Current: 25mA (max 50mA)
• Output Type: Digital (HIGH/LOW)
• Operating Frequency: DC – 100kHz
• Operating Temperature: -40°C to +150°C
• Module Size: 18.5 × 14.6mm
• Pack Quantity: 20 modules

Hall Effect vs Reed Switch

• Hall effect (this module): Solid-state, no moving parts, fast response (DC–100kHz), vibration-resistant, works with any magnet orientation
• Reed switch: Mechanical contacts, slower response, sensitive to vibration, lower cost

Arduino Wiring

• VCC → 5V | GND → GND | OUT → Arduino digital input pin
• Output goes LOW when magnet is present (active LOW)
• Use digitalRead() to detect magnet presence

Typical Applications

• Non-contact switch: Detect magnet position without physical contact
• Speed measurement: Count magnet passes on rotating shaft (RPM sensor)
• Automotive ignition: Crankshaft position detection
• Safety alarm: Door/window open detection with magnet
• Brushless motor commutation: Rotor position sensing

KY-003 Hall effect sensor module, 20-pack — unipolar, 4.5–24V, temperature-compensated for Arduino non-contact switching, speed detection, and position sensing.

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