Hall Reed Magnetic Switch Module FC-01 for Arduino

Description

Here is a complete description of the Reed Switch Magnetic Sensor Interrupter Switch FC-01 Module for Arduinofollowed by a practical guide to use with code examples for Arduino.

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📦 Module FC-01 Description

The Module FC-01 is a magnetic sensor based on a Reed Switch or a Hall Effect Sensor, used to detect the presence of a magnetic field. When a magnet is brought close to the sensor, it activates the internal switch, generating a digital output signal (HIGH or LOW).

🔧 Technical Specifications:

• Module Name: FC-01
• Main Sensor: Magnetic Reed Switch or Hall Effect Sensor
• Operating Voltage: 3.3V – 5V
• Output Type: Digital (0 or 1)
• Interface: 3 pin (VCC, GND, DO)
• Onboard LED: Visually indicates when the sensor detects a magnetic field
• Compact dimensions: Approximately 3.2 cm × 1.4 cm
• Sensitivity Adjustment: Some models include a potentiometer (for Hall Effect models)

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⚙️ FC-01 Module Connections to Arduino

FC-01 Pin	Arduino Pin
VCC	5V
GND	GND
DO	D2 (or any digital pin)

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🧪 How it works

• When there is no magnetic field, the output DO is HIGH (value 1).
• When a magnet is near the sensor, the switch closes and the output DO goes LOW (value 0).
• The built-in LED turns on when the sensor is activated (magnet detected).

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🧰 Guide to programming with Arduino

1️⃣ Base code to read the sensor state

const int sensorPin = 2;    // DO collegato al pin digitale 2
const int ledPin = 13;      // LED integrato su Arduino per segnalazione

void setup() {
  pinMode(sensorPin, INPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int sensorValue = digitalRead(sensorPin);

  if (sensorValue == LOW) {
    Serial.println("Magnete Rilevato!");
    digitalWrite(ledPin, HIGH);  // Accende LED
  } else {
    Serial.println("Nessun magnete");
    digitalWrite(ledPin, LOW);   // Spegne LED
  }

  delay(200);
}

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🧪 Usage examples

🔒 1. Door opening/closing detection

Connect the module to a port: when opened (magnet moves away), Arduino can trigger an alarm or send a notification.

💡 2. Count steps (rotations or objects)

By attaching a magnet to a wheel or rotating object, each pass near the sensor generates a pulse: can be used as a counter.

🎮 3. Invisible switch

A hidden sensor under a panel can serve as a magnetic switch without visible contact.

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🔄 Code for magnetic counter (increments each pass)

const int sensorPin = 2;
int counter = 0;
bool lastState = HIGH;

void setup() {
  pinMode(sensorPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  bool currentState = digitalRead(sensorPin);

  if (lastState == HIGH && currentState == LOW) {
    counter++;
    Serial.print("Conteggio: ");
    Serial.println(counter);
    delay(300); // debounce semplice
  }

  lastState = currentState;
}

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🧯 Practical tips

• Debounce: the sensor can generate false pulses due to vibrations. Use a small delay() or a software filter.
• Stable power supply: if you use multiple sensors, make sure the 5V line is well powered.
• Compatibility: works well with all Arduino boards (Uno, Nano, Mega, etc).

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📌 Conclusion

The FC-01 Module is economical, reliable and perfect for projects that require detecting the presence of a magnet. It is ideal for hobbyists and makers who want to create security systems, counters, or simple contactless magnetic switches.

Tutorial: How to Use the FC-01 Magnetic Sensor

The FC-01 magnetic sensor is ideal for projects that require magnetic field detection. Useful for beginners and intermediates, it is perfect for controlling the presence or absence of a magnetic object.

What you need

• Arduino UNO or compatible
• Power Supply Cable
• Ground Cable
• Signal cable
• Electronic tools

Steps

1. 1. Have the Arduino UNO and the FC-01 sensor available.
2. 2. Connect the sensor to pin A0 of your Arduino.
3. 3. Connect the VCC of the sensor to the VCC of your Arduino.
4. 4. Connect the GND of the sensor to the GND of your Arduino.
5. 5. Load the following code onto your Arduino.
6. 6. Verify the exact pin positions in the datasheet.
7. 7. Try moving a magnetic object near the sensor.
8. 8. Check that the LED on your Arduino lights up when the magnetic object is nearby.

Example code

```void setup() {  Serial.begin(9600);}void loop() {  int val = analogRead(A0);  Serial.println(val);  delay(100);}```

Mini project

Build an alarm system based on a magnetic sensor. Connect the sensor to a relay and a bell. When the magnetic object is moved, the bell sounds.

Common mistakes

• Do not connect the sensor pins correctly.
• Do not verify the correct pin positions.
• Do not use a compatible Arduino.
• Do not test the sensor with a magnetic object.

Recommended accessories

• Relay
• Bell
• 5V power supply
• LED

Frequently asked questions

Does the sensor not react when I move a magnetic object?
Check the correct pin placement and orientation of the sensor.

What is the sensor’s ground pin?
The pin GND.

Can I use an Arduino Nano?
Yes, the Arduino Nano is compatible.

Does the sensor require external power?
No, the power is provided by the Arduino.