Analog Hall Magnetic Sensor Module KY-035

Analog Hall Magnetic Sensor Module KY-035

Sensors
DET585
Part.No: KY-035
€1.75
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KY-035 Analog Hall Magnetic Sensor Module with built-in LED indicator. Detects magnetic fields and outputs an analog signal — ideal for Arduino and compatible microcontroller projects.

 

The KY-035 Analog Hall Magnetic Sensor Module (MPN: KY-035) is a compact sensor module that detects the presence and strength of magnetic fields using a Hall-effect sensor. Unlike purely digital magnetic sensors, the KY-035 provides an analog output signal, allowing your microcontroller to read varying magnetic field intensities — not just a simple on/off state. The module also features a built-in LED (connected to digital pin 13) that visually indicates when a magnetic signal is detected, making it easy to verify operation at a glance.

Key Features

  • Analog Output: Provides a continuously varying voltage signal proportional to the magnetic field → enables field strength measurement, not just detection
  • Built-in LED Indicator: On-board LED lights up when the sensor detects a magnetic signal → instant visual feedback without extra wiring
  • Simple Interface: Connects directly to an analog input pin on Arduino → no additional components required
  • Compact Module Design: Ready-to-use PCB with standard pin header → easy to integrate into breadboard or custom PCB projects

Pinout & Wiring

PINSymbolDescription
1S (Signal)Analog output — connect to Arduino analog pin (e.g. A5)
2VCCPower supply (5V)
3GNDGround

Wiring note: Connect the Signal pin to an analog input such as A5, VCC to the 5V rail, and GND to ground. Use analogRead(A5) in your sketch to read the magnetic field value (0–1023).

Compatibility

  • Arduino UNO / Nano / Mega: Fully compatible — operates at 5V logic and connects directly to analog input pins.
  • ESP32 / ESP8266 (3.3V): Use a voltage divider or level shifter on the signal line, as the module is designed for 5V operation.
  • Raspberry Pi: Requires an ADC (e.g. MCP3008) since Raspberry Pi GPIO does not have native analog inputs.

Typical Applications

  • Proximity detection: Detect when a magnet-equipped object (door, drawer, gear) passes near the sensor — useful in home automation and robotics.
  • RPM / speed measurement: Count rotations of a shaft fitted with a small magnet to measure motor or wheel speed.
  • Contactless position sensing: Determine the relative position of a moving magnet without physical contact.
  • Magnetic field mapping: Log analog readings to map the field strength around magnets or electromagnets in educational projects.
  • Alarm & security systems: Trigger an alert when a magnetic field is present or absent (e.g. open window/door detection).

Technical Specifications

InterfaceAnalog output + Digital LED indicator
Operating Voltage5V DC
Sensor TypeHall-effect (analog)
LED PinDigital pin 13 (built-in)
Compatible PlatformArduino and compatible microcontrollers
MPNKY-035

Frequently Asked Questions

Q: What is the difference between the KY-035 and the digital Hall sensor KY-003?
A: The KY-035 provides an analog voltage output that reflects the strength of the magnetic field, while the KY-003 outputs only a digital HIGH/LOW signal. The KY-035 is better suited for applications where you need to measure field intensity, not just detect presence.

Q: What type of magnet works with the KY-035?
A: Any permanent magnet (neodymium, ferrite) or electromagnet that produces a detectable magnetic flux will work. Bring the magnet close to the sensor face and observe the analog reading change on your serial monitor.

Package Contents: 1× KY-035 Analog Hall Magnetic Sensor Module

⚠ Note: Operate at 5V as specified. Applying higher voltages may permanently damage the sensor IC.
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