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

NPN Normally Open (NO) magnetic switch
3-wire connection: VCC, GND, Output
Wide voltage range: 4.5V–30V DC
Built-in LED indicator for magnetic detection
Fast, non-contact sensing
Compatible with Arduino and other microcontrollers
Durable and compact M12 threaded design

SKU: aA1788 Categories: Hall Sensor, Sensors Tags: Arduino, Hall Sensor, Sensors

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Description

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.

🔌

Pin Connections

1 Table

Pin Connections Table 1

Board	Sensor Pin	Connection
NJK-5002C	Brown/Blue/Black	5-12V / GND / board digital pin (use INPUT_PULLUP)

📟

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

7 Examples • C/C++ | Boards: Arduino Uno, Arduino Nano, Arduino Mega, ESP32, ESP8266, STM32, Raspberry Pi Pico

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

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

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

NJK-5002C Hall Effect Sensor - NPN NO 3-Wire Magnet | Arduino Compatible - ESP32

NJK-5002C Hall Effect Sensor - NPN NO 3-Wire Magnet | Arduino Compatible - ESP8266

NJK-5002C Hall Effect Sensor - NPN NO 3-Wire Magnet | Arduino Compatible - STM32

NJK-5002C Hall Effect Sensor - NPN NO 3-Wire Magnet | Arduino Compatible - Raspberry Pi Pico

📄 File: njk-5002c_hall_effect_sensor_-_npn_no_3-wire_magnet_|_arduino_compatible_-_arduino_uno.inoArduino Uno

332 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 2 on Arduino Uno

6#define SWITCH_PIN 2

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Magnet: TRIGGERED" : "Magnet: idle");

16 delay(200);

17}

📄 File: njk-5002c_hall_effect_sensor_-_npn_no_3-wire_magnet_|_arduino_compatible_-_arduino_nano.inoArduino Nano

333 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 2 on Arduino Nano

6#define SWITCH_PIN 2

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Magnet: TRIGGERED" : "Magnet: idle");

16 delay(200);

17}

📄 File: njk-5002c_hall_effect_sensor_-_npn_no_3-wire_magnet_|_arduino_compatible_-_arduino_mega.inoArduino Mega

333 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 2 on Arduino Mega

6#define SWITCH_PIN 2

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Magnet: TRIGGERED" : "Magnet: idle");

16 delay(200);

17}

📄 File: njk-5002c_hall_effect_sensor_-_npn_no_3-wire_magnet_|_arduino_compatible_-_esp32.inoESP32

326 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 4 on ESP32

6#define SWITCH_PIN 4

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Magnet: TRIGGERED" : "Magnet: idle");

16 delay(200);

17}

📄 File: njk-5002c_hall_effect_sensor_-_npn_no_3-wire_magnet_|_arduino_compatible_-_esp8266.inoESP8266

330 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin D4 on ESP8266

6#define SWITCH_PIN D4

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Magnet: TRIGGERED" : "Magnet: idle");

16 delay(200);

17}

📄 File: njk-5002c_hall_effect_sensor_-_npn_no_3-wire_magnet_|_arduino_compatible_-_stm32.inoSTM32

330 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin PB4 on STM32

6#define SWITCH_PIN PB4

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Magnet: TRIGGERED" : "Magnet: idle");

16 delay(200);

17}

📄 File: njk-5002c_hall_effect_sensor_-_npn_no_3-wire_magnet_|_arduino_compatible_-_raspberry_pi_pico.inoRaspberry Pi Pico

338 characters

1//ekostra.com

2//electronics store in egypt

3//+201008896258

5// Digital pin 2 on Raspberry Pi Pico

6#define SWITCH_PIN 2

8void setup() {

9 Serial.begin(115200);

10 pinMode(SWITCH_PIN, INPUT_PULLUP);

11}

13void loop() {

14 int state = digitalRead(SWITCH_PIN);

15 Serial.println(state == LOW ? "Magnet: TRIGGERED" : "Magnet: idle");

16 delay(200);

17}

Project Notes:

NPN normally-open hall-effect proximity sensor.

Specification

WeightWeight	6 g
Dimensions	3 × 2 × 1 cm
model	NJK-5002C
sensor-type	Hall Effect (Magnetic Proximity)
output-type	NPN, Normally Open (NO)
voltage-range	4.5V to 30V DC
current-consumption	≤ 10mA
detection-distance	~10mm (depends on magnet size)
output-current-max	150mA
cable-length	~1 meter
output-indicator	Built-in LED
wire-color-code	Brown: VCC, Blue: GND, Black: Output
mounting	M12 threaded body (optional nut included)
operating-temp	-20°C to +60°C

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