2C21 KY-003 Hall Magneticfield-Sensor module

The KY-003 Hall Magnetic Sensor module is a switch that reacts to the presence of a magnetic field, turning itself on or off. Compatible with popular microcontrolers like Arduino, Raspberry Pi and ESP32.

This module offers a digital output, it looks similar to the KY-035 analog hall magnetic sensor, and it is functionally similar to the KY-024, a digital/analog magnetic sensor.

Specifications

This module consists of a 3144EUA-S Hall-effect switch, a 680Ω resistor, an LED and 3 male header pins.

Connection Diagram

Connect the board power line (middle) and ground (-) to +5 and GND on the Arduino respectively.

Connect signal (S) to pin 3 on the Arduino.

Arduino Code

The following Arduino sketch will turn on the LED on pin 13 when you put a magnet near the module.

int led = 13;//LED pin
int sensor = 3; //sensor pin
int val; //numeric variable

void setup()
{
	pinMode(led, OUTPUT); //set LED pin as output
	pinMode(sensor, INPUT); //set sensor pin as input
}

void loop()
{
	val = digitalRead(sensor); //Read the sensor
	if(val == LOW) //when magnetic field is detected, turn led on
	{
		digitalWrite(led, HIGH);
	}
	else
	{
		digitalWrite(led, LOW);
	}
}