Hall Magnetic Sensor Module KY-003

Hall Magnetic Sensor Module KY-003

Sensors
DET553
Part.No: KY-003
€1.95
In Stock
Immediate Dispatch
KY-003 Hall Magnetic Sensor Module — detects magnetic fields using the 3144 Hall-effect IC and outputs a clean digital signal. Ideal for Arduino projects requiring contactless position or proximity sensing.

 

The KY-003 Hall Magnetic Sensor Module (MPN: KY-003) is a digital magnetic field detector built around the 3144 Hall-effect switch IC. When a magnet approaches the sensor, the module outputs a digital HIGH or LOW signal — making it perfect for contactless detection of rotating parts, open/close states, or magnetic proximity events in your Arduino or microcontroller project.

The 3144 IC integrates a voltage regulator, Hall voltage generator, differential amplifier, Schmitt trigger, temperature compensation, and an open-collector output stage into a single magnetic-sensitive circuit. The result: a clean, debounce-free digital output that reacts reliably to changes in magnetic flux density.

Κύρια Χαρακτηριστικά / Key Features

  • 3144 Hall-Effect IC: Combines voltage regulation, differential amplification, Schmitt trigger, and temperature compensation on one chip → stable and accurate magnetic detection
  • Digital Output: Outputs a clean digital voltage signal, not an analog value → directly readable by any microcontroller digital pin
  • Schmitt Trigger Stage: Eliminates signal chatter at the switching threshold → no additional debounce code needed
  • Temperature Compensation: Built-in compensation circuit → consistent performance across varying ambient temperatures
  • Open-Collector Output: Flexible output stage compatible with various logic levels → easy integration into 3.3 V and 5 V systems
  • Onboard LED Indicator: Visual feedback when a magnetic field is detected → simplifies debugging and prototyping

Pinout & Σύνδεση / Pinout & Wiring

PINSymbolDescription
1GNDGround — connect to GND rail
2VCCPower supply input (typically 5 V for Arduino)
3S / OUTDigital signal output — connect to a digital input pin

Wiring note: Connect VCC to the 5 V pin of your Arduino, GND to GND, and S to a digital input pin (e.g., D2). In your sketch, read the pin with digitalRead() — the output goes LOW when a magnet is detected. The onboard LED mirrors the output state for easy live verification. As an introductory demo, connect S to digital pin 13 (which drives the Arduino's onboard LED) to create a simple magnetic flasher with no extra components.

Συμβατότητα / Compatibility

  • Arduino UNO / Nano / Mega: Fully compatible — module operates at 5 V logic, matches Arduino's digital I/O levels directly.
  • ESP32 / ESP8266 / Raspberry Pi (3.3 V systems): Use a logic-level shifter or voltage divider on the signal line to protect 3.3 V GPIO pins from a 5 V output stage.

Τυπικές Εφαρμογές / Typical Applications

  • Rotation speed sensing: Attach a small magnet to a spinning shaft and count pulses to measure RPM — ideal for DIY tachometers and motor controllers.
  • Contactless door/drawer detection: Detect whether a door is open or closed without physical contact — great for home automation and security projects.
  • Magnetic encoder feedback: Use with a multi-pole magnet disc to provide position feedback in robotics and CNC applications.
  • Anti-tamper detection: Trigger an alert when a magnetic seal is broken — useful in smart locks and enclosure monitoring.
  • Educational demonstrations: Teach Hall-effect principles and digital sensing in maker workshops, university labs, and STEM curricula.

Τεχνικά Χαρακτηριστικά / Technical Specifications

ParameterValue
InterfaceDigital output
IC3144 Hall-effect switch
Output typeOpen-collector digital signal
Output stageVoltage regulator, Hall voltage generator, differential amplifier, Schmitt trigger, temperature compensation, open-collector output
MPNKY-003

Συχνές Ερωτήσεις / FAQ

Q: Does the KY-003 detect both north and south magnetic poles?
A: The 3144 IC is a unipolar Hall switch — it responds to one polarity (typically the south pole of a magnet). If the sensor does not trigger, try flipping your magnet around.

Q: Can I use the KY-003 with a 3.3 V microcontroller like the ESP32?
A: The module is designed for 5 V operation. You can power it at 5 V and use a voltage divider or logic-level shifter on the signal line to safely interface with 3.3 V GPIO pins.

Συσκευασία / Package contents: 1 × KY-003 Hall Magnetic Sensor Module

⚠ Note: A magnet is not included with the module. Keep strong magnets away from other sensitive electronic components during testing.
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