NJK-5002C Hall Effect Sensor – NPN NO 3-Wire Magnet | Arduino Compatible

Take your automation projects to the next level with the NJK-5002C Hall Effect Sensor, a reliable, non-contact magnetic switch ideal for detecting the presence of ferromagnetic objects. This NPN-type, normally open (NO) 3-wire sensor is perfect for use with Arduino, Raspberry Pi, or other microcontroller platforms, and operates in a wide voltage range of 4.5V to 30V DC, making it suitable for both low-power and industrial applications.

Whether you’re designing a smart can crusher, door sensor, or automated counter, the NJK-5002C ensures consistent and accurate triggering in the presence of a magnetic field.

✅ Features:

• NPN Normally Open (NO) Output
  Activates output only when magnetic field is detected.

• Wide Operating Voltage (4.5V – 30V DC)
  Flexible power compatibility for DIY and industrial applications.

• 3-Wire Configuration (Brown: VCC, Blue: GND, Black: Output)
  Simple wiring and easy integration with most microcontrollers.

• Non-Contact Magnetic Detection
  Detects the presence of magnets without physical contact, increasing durability and lifespan.

• Built-in LED Indicator
  Visual feedback when magnetic field is detected.

• Fast Response Time
  Ideal for automation systems where quick sensing is critical.

• Rugged and Compact Design
  Suitable for harsh environments or confined spaces.

Tips for Arduino Users:

• Sensor Output is Active LOW when a magnet is nearby — even though it’s labeled “NPN NO”, the output pin pulls LOW when active.

• If you’re using INPUT_PULLUP on the Arduino, the digitalRead() will return LOW when the sensor detects the magnet.

• Connect the Black wire to Arduino pin, Blue to GND, Brown to 5V (or 12V with appropriate voltage divider or optocoupler).

• Always test the output using a multimeter or LED before connecting to the Arduino to verify behavior.