How to Use KY-024 Sensor de Campo Magnético : Examples, Pinouts, and Specs

The KY-024 Magnetic Field Sensor, manufactured by Arduino (Part ID: MM), is a versatile component designed to detect the presence and strength of magnetic fields. It outputs an analog voltage proportional to the detected magnetic field strength and includes a digital output for threshold-based detection. This sensor is widely used in applications such as compass systems, magnetic field detection, proximity sensing, and robotics.

The KY-024 sensor combines a linear Hall-effect sensor and a potentiometer for sensitivity adjustment. Below are its key technical details:

• Operating Voltage: 3.3V to 5V DC
• Output Types:
  • Analog output (proportional to magnetic field strength)
  • Digital output (high/low based on threshold)
• Sensitivity Adjustment: Via onboard potentiometer
• Dimensions: 32mm x 14mm x 8mm
• Operating Temperature: -40°C to 85°C
• Manufacturer Part ID: MM

The KY-024 sensor has a 3-pin interface for easy integration into circuits. Below is the pinout:

The KY-024 sensor is straightforward to use in a variety of circuits. Below are the steps and considerations for proper usage:

1. Wiring:

   • Connect the VCC pin of the KY-024 to the 5V pin on the Arduino UNO.
   • Connect the GND pin of the KY-024 to the GND pin on the Arduino UNO.
   • Connect the AO pin of the KY-024 to an analog input pin (e.g., A0) on the Arduino UNO.
   • Optionally, connect the DO pin to a digital input pin (e.g., D2) for threshold-based detection.

2. Adjusting Sensitivity:

   • Use the onboard potentiometer to adjust the sensitivity of the digital output. Turning the potentiometer clockwise increases sensitivity, while turning it counterclockwise decreases sensitivity.

3. Arduino Code Example: Below is an example Arduino sketch to read both the analog and digital outputs of the KY-024 sensor:

   // KY-024 Magnetic Field Sensor Example
   // Reads analog and digital outputs and prints them to the Serial Monitor
   
   const int analogPin = A0; // Pin connected to AO (Analog Output)
   const int digitalPin = 2; // Pin connected to DO (Digital Output)
   
   void setup() {
     Serial.begin(9600); // Initialize serial communication at 9600 baud
     pinMode(digitalPin, INPUT); // Set digital pin as input
   }
   
   void loop() {
     int analogValue = analogRead(analogPin); // Read analog value
     int digitalValue = digitalRead(digitalPin); // Read digital value
   
     // Print the values to the Serial Monitor
     Serial.print("Analog Value: ");
     Serial.print(analogValue);
     Serial.print(" | Digital Value: ");
     Serial.println(digitalValue);
   
     delay(500); // Wait for 500ms before the next reading
   }
   

• Ensure the sensor is powered within its operating voltage range (3.3V to 5V DC).
• Avoid placing the sensor near strong electromagnetic interference sources, as this may affect accuracy.
• Use the analog output for precise magnetic field strength measurements and the digital output for simple threshold-based detection.
• Calibrate the sensor using the potentiometer to suit your specific application.

1. No Output from the Sensor:

   • Cause: Incorrect wiring or insufficient power supply.
   • Solution: Double-check the connections and ensure the sensor is powered with 3.3V to 5V DC.

2. Analog Output is Constant:

   • Cause: The sensor is not exposed to a magnetic field or the field is too weak.
   • Solution: Test the sensor with a stronger magnet or adjust the potentiometer for higher sensitivity.

3. Digital Output Always High or Low:

   • Cause: Incorrect threshold setting on the potentiometer.
   • Solution: Rotate the potentiometer to adjust the threshold level.

4. Fluctuating Readings:

   • Cause: Electromagnetic interference or unstable power supply.
   • Solution: Place the sensor away from interference sources and use a decoupling capacitor on the power supply.

Q1: Can the KY-024 detect the polarity of a magnetic field?
A1: No, the KY-024 cannot detect the polarity of a magnetic field. It only measures the strength of the field.

Q2: What is the range of magnetic field strength the KY-024 can detect?
A2: The exact range depends on the Hall-effect sensor used, but it is typically suitable for detecting small to moderate magnetic fields.

Q3: Can I use the KY-024 with a 3.3V microcontroller?
A3: Yes, the KY-024 is compatible with 3.3V systems, but ensure the output voltage levels are within the microcontroller's input range.

Q4: How do I know if the sensor is working?
A4: Use a multimeter to measure the voltage on the AO pin. The voltage should vary when a magnet is brought near the sensor.

By following this documentation, you can effectively integrate and troubleshoot the KY-024 Magnetic Field Sensor in your projects.