How to Use KY-037: Examples, Pinouts, and Specs

The KY-037 is a sound sensor module designed to detect sound levels and convert them into an analog voltage output. It features a high-sensitivity microphone and an onboard potentiometer for adjusting the sensitivity. The module provides both analog and digital outputs, making it versatile for a wide range of applications.

• Sound-activated switches
• Audio level monitoring
• Voice-activated systems
• Environmental noise detection
• DIY electronics and Arduino projects

The KY-037 sound sensor module has the following key specifications:

The KY-037 module has four pins, as described in the table below:

1. Power the Module: Connect the VCC pin to a 3.3V or 5V power source and the GND pin to the ground.
2. Connect Outputs:
   • For analog sound level readings, connect the A0 pin to an analog input pin on your microcontroller.
   • For digital sound detection, connect the D0 pin to a digital input pin on your microcontroller.
3. Adjust Sensitivity: Use the onboard potentiometer to set the desired sound threshold for the digital output (D0).

• Power Supply: Ensure the module is powered within its operating voltage range (3.3V - 5V).
• Noise Interference: Place the module away from sources of electrical noise to avoid false readings.
• Sensitivity Adjustment: Fine-tune the potentiometer to achieve the desired sensitivity for your application.
• Analog vs. Digital Output: Use the analog output (A0) for precise sound level measurements and the digital output (D0) for simple sound detection.

Below is an example of how to use the KY-037 with an Arduino UNO to read both analog and digital outputs:

// KY-037 Sound Sensor Example with Arduino UNO
// Reads analog sound levels and detects sound using the digital output

// Define pin connections
const int analogPin = A0;  // KY-037 A0 connected to Arduino A0
const int digitalPin = 2;  // KY-037 D0 connected to Arduino digital pin 2
const int ledPin = 13;     // Built-in LED for sound detection feedback

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

void loop() {
  // Read analog sound level
  int soundLevel = analogRead(analogPin);
  Serial.print("Analog Sound Level: ");
  Serial.println(soundLevel);

  // Check digital sound detection
  if (digitalRead(digitalPin) == HIGH) {
    digitalWrite(ledPin, HIGH);  // Turn on LED if sound is detected
    Serial.println("Sound Detected!");
  } else {
    digitalWrite(ledPin, LOW);   // Turn off LED if no sound is detected
  }

  delay(100);  // Small delay for stability
}

1. No Output from the Module:

   • Ensure the module is powered correctly (3.3V - 5V).
   • Check all connections for loose wires or incorrect pin assignments.

2. Digital Output Always HIGH or LOW:

   • Adjust the sensitivity using the onboard potentiometer.
   • Verify that the sound level exceeds the threshold for detection.

3. Inconsistent Analog Readings:

   • Minimize electrical noise by using shorter wires and proper grounding.
   • Ensure the microphone is not obstructed or damaged.

4. Arduino Not Detecting Sound:

   • Confirm that the correct pins are defined in the Arduino code.
   • Test the module with a multimeter to verify its output.

Q: Can the KY-037 detect specific frequencies?
A: No, the KY-037 is not frequency-selective. It detects overall sound levels and cannot differentiate between specific frequencies.

Q: How do I know if the module is working?
A: The onboard LED will light up when the digital output (D0) is HIGH, indicating sound detection.

Q: Can I use the KY-037 with a 3.3V microcontroller?
A: Yes, the KY-037 is compatible with both 3.3V and 5V systems. Ensure the VCC pin is connected to the appropriate voltage.

Q: What is the range of the analog output?
A: The analog output (A0) provides a voltage range from 0V to the supply voltage (3.3V or 5V), proportional to the detected sound level.