Circuit Documentation

Summary

This circuit is designed to read analog signals from two KY-037 microphones, process them through a Sparkfun Configurable OpAmp Board (TSH82), and perform basic noise cancellation using an Arduino UNO. The processed signal is then printed to the Serial Monitor. This setup is a basic example and does not represent a true adaptive filter. For effective noise cancellation, a more sophisticated algorithm like the Least Mean Squares (LMS) algorithm should be implemented.

Component List

1. Arduino UNO

   • Description: A microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. KY-037 Microphone (Primary)

   • Description: A microphone sensor module with both analog and digital outputs.
   • Pins: Analog output, Ground, VCC, Digital output

3. KY-037 Microphone (Reference)

   • Description: A microphone sensor module with both analog and digital outputs.
   • Pins: Analog output, Ground, VCC, Digital output

4. Sparkfun Configurable OpAmp Board - TSH82

   • Description: An operational amplifier board that can be configured for various applications.
   • Pins: VCC, VNEG, VREF, +IN1, OUT1, -IN1, +IN2, -IN2, OUT2

Wiring Details

Arduino UNO

• 3.3V connected to:

  • KY-037 Microphone (Primary) VCC
  • KY-037 Microphone (Reference) VCC

• 5V connected to:

  • Sparkfun Configurable OpAmp Board - TSH82 VCC

• GND connected to:

  • KY-037 Microphone (Primary) Ground
  • KY-037 Microphone (Reference) Ground
  • Sparkfun Configurable OpAmp Board - TSH82 VNEG

• A0 connected to:

  • Sparkfun Configurable OpAmp Board - TSH82 OUT1

• A1 connected to:

  • Sparkfun Configurable OpAmp Board - TSH82 OUT2

• D1 connected to:

  • KY-037 Microphone (Primary) Digital output

• D0 connected to:

  • KY-037 Microphone (Reference) Digital output

KY-037 Microphone (Primary)

• VCC connected to:

  • Arduino UNO 3.3V

• Ground connected to:

  • Arduino UNO GND

• Analog output connected to:

  • Sparkfun Configurable OpAmp Board - TSH82 +IN1

• Digital output connected to:

  • Arduino UNO D1

KY-037 Microphone (Reference)

• VCC connected to:

  • Arduino UNO 3.3V

• Ground connected to:

  • Arduino UNO GND

• Analog output connected to:

  • Sparkfun Configurable OpAmp Board - TSH82 +IN2

• Digital output connected to:

  • Arduino UNO D0

Sparkfun Configurable OpAmp Board - TSH82

• VCC connected to:

  • Arduino UNO 5V

• VNEG connected to:

  • Arduino UNO GND

• OUT1 connected to:

  • Arduino UNO A0

• OUT2 connected to:

  • Arduino UNO A1

• +IN1 connected to:

  • KY-037 Microphone (Primary) Analog output

• +IN2 connected to:

  • KY-037 Microphone (Reference) Analog output

Code Documentation

/*
 * This Arduino sketch reads analog signals from two KY-037 microphones, 
 * processes them through an op-amp, and attempts a basic noise cancellation 
 * by subtracting the reference signal from the primary signal. The result is 
 * printed to the Serial Monitor. This is a basic example and does not represent 
 * a true adaptive filter. For effective noise cancellation, a more sophisticated 
 * algorithm like the Least Mean Squares (LMS) algorithm should be implemented.
 */

const int mic1Pin = A0; // Primary microphone signal
const int mic2Pin = A1; // Reference microphone signal
const int mic1DigitalPin = 1; // Digital output from primary mic
const int mic2DigitalPin = 0; // Digital output from reference mic

void setup() {
    Serial.begin(9600); // Initialize serial communication at 9600 baud
    pinMode(mic1DigitalPin, INPUT); // Set digital pin for primary mic as input
    pinMode(mic2DigitalPin, INPUT); // Set digital pin for reference mic as input
}

void loop() {
    int primarySignal = analogRead(mic1Pin); // Read primary mic analog signal
    int referenceSignal = analogRead(mic2Pin); // Read reference mic analog signal

    // Basic noise cancellation by subtracting reference from primary signal
    int filteredSignal = primarySignal - referenceSignal;

    // Print the filtered signal to the Serial Monitor
    Serial.println(filteredSignal);
    delay(10); // Short delay for stability
}

This code initializes the Arduino UNO to read analog signals from two KY-037 microphones and perform basic noise cancellation by subtracting the reference signal from the primary signal. The filtered signal is then printed to the Serial Monitor.