How to Use Hall Effect Magnetic Sensor Module: Examples, Pinouts, and Specs

The Hall Effect Magnetic Sensor Module (Manufacturer: HiLetgo, Part ID: 3-01-1193) is a versatile electronic component designed to detect the presence and strength of a magnetic field. It operates based on the Hall effect, which generates a voltage difference across a conductor when it is exposed to a magnetic field. This module is widely used in applications such as position sensing, proximity detection, speed measurement, and current sensing.

• Position Sensing: Detecting the position of moving parts in machinery.
• Proximity Detection: Identifying the presence of magnetic objects.
• Speed Measurement: Measuring the rotational speed of motors or wheels.
• Current Measurement: Monitoring current flow in circuits using magnetic fields.

The following table outlines the key technical details of the HiLetgo Hall Effect Magnetic Sensor Module:

The module has three pins, as described in the table below:

1. Power the Module: Connect the VCC pin to a 3.3V or 5V DC power source and the GND pin to the ground of your circuit.
2. Connect the Output: Attach the OUT pin to a digital input pin of your microcontroller or other logic-level device.
3. Place the Magnet: Position a magnet near the sensor. The module will output a LOW signal when a magnetic field is detected and a HIGH signal when no magnetic field is present.

• Magnet Placement: Ensure the magnet is aligned properly with the sensor for accurate detection.
• Power Supply: Use a stable power source to avoid erratic behavior.
• Interference: Avoid placing the module near strong electromagnetic interference sources, as this may affect its performance.
• Pull-up Resistor: If the output is connected to a microcontroller, ensure the input pin is configured with a pull-up resistor if required.

Below is an example of how to use the Hall Effect Magnetic Sensor Module with an Arduino UNO:

• Connect the VCC pin of the module to the 5V pin on the Arduino.
• Connect the GND pin of the module to the GND pin on the Arduino.
• Connect the OUT pin of the module to digital pin 2 on the Arduino.

// Hall Effect Magnetic Sensor Module Example
// Manufacturer: HiLetgo, Part ID: 3-01-1193

const int sensorPin = 2;  // Digital pin connected to the OUT pin of the sensor
const int ledPin = 13;    // Built-in LED pin on Arduino

void setup() {
  pinMode(sensorPin, INPUT);  // Set sensor pin as input
  pinMode(ledPin, OUTPUT);    // Set LED pin as output
  Serial.begin(9600);         // Initialize serial communication
}

void loop() {
  int sensorState = digitalRead(sensorPin);  // Read the sensor output

  if (sensorState == LOW) {
    // Magnetic field detected
    digitalWrite(ledPin, HIGH);  // Turn on the LED
    Serial.println("Magnetic field detected!");
  } else {
    // No magnetic field detected
    digitalWrite(ledPin, LOW);   // Turn off the LED
    Serial.println("No magnetic field detected.");
  }

  delay(500);  // Wait for 500ms before the next reading
}

1. No Output Signal:

   • Cause: Incorrect wiring or loose connections.
   • Solution: Double-check all connections, ensuring the VCC and GND pins are properly connected.

2. Erratic Behavior:

   • Cause: Unstable power supply or electromagnetic interference.
   • Solution: Use a regulated power supply and keep the module away from interference sources.

3. Sensor Not Detecting Magnetic Field:

   • Cause: Magnet is too weak or improperly aligned.
   • Solution: Use a stronger magnet and ensure proper alignment with the sensor.

Q: Can this module detect both north and south poles of a magnet?
A: Yes, the module can detect both poles, but it does not differentiate between them.

Q: What is the maximum distance for magnetic field detection?
A: The detection range depends on the strength of the magnet. Typically, it can detect fields within a few centimeters.

Q: Can I use this module with a 3.3V microcontroller?
A: Yes, the module operates at both 3.3V and 5V, making it compatible with 3.3V microcontrollers like ESP32.

Q: Is the output signal analog or digital?
A: The output signal is digital, providing a HIGH or LOW state based on the presence of a magnetic field.