ky-037 high sensitivity sound detection module

				
					#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// OLED display settings
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// Microphone pin
#define MIC_PIN A0

// Data buffer
const int sampleWindow = 50; // Sampling window width (ms)
const int dataSize = 128;    // Number of data points
int waveData[dataSize];      // Store waveform data
int dataIndex = 0;           // Data index

// Sound parameters
unsigned int sample;
unsigned long startMillis;
unsigned int peakToPeak = 0;
unsigned int signalMax = 0;
unsigned int signalMin = 1024;

void setup() {
  Serial.begin(9600);

  // Initialize OLED
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.display();
  delay(2000);
  display.clearDisplay();

  // Set microphone pin
  pinMode(MIC_PIN, INPUT);

  Serial.println("System startup completed");
}

void loop() {
  // Collect sound data
  collectAudioData();

  // Update OLED display
  updateDisplay();

  // Short delay
  delay(50);
}

void collectAudioData() {
  startMillis = millis();
  signalMax = 0;
  signalMin = 1024;

  // Collect audio data within 50ms
  while (millis() - startMillis < sampleWindow) {
    sample = analogRead(MIC_PIN);
    if (sample < 1024) {
      if (sample > signalMax) {
        signalMax = sample;
      } else if (sample < signalMin) {
        signalMin = sample;
      }
    }
  }

  // Calculate peak-to-peak value
  peakToPeak = signalMax - signalMin;

  // Store data in buffer
  waveData[dataIndex] = peakToPeak;
  dataIndex = (dataIndex + 1) % dataSize;
}

void updateDisplay() {
  display.clearDisplay();

  // Draw title
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Sound Level: ");
  display.print(peakToPeak);
  display.print("   ");

  // Draw waveform
  for (int i = 0; i < dataSize - 1; i++) {
    int currentIndex = (dataIndex + i) % dataSize;
    int nextIndex = (dataIndex + i + 1) % dataSize;

    // Map to screen height
    int y1 = map(waveData[currentIndex], 0, 1023, SCREEN_HEIGHT - 5, 15);
    int y2 = map(waveData[nextIndex], 0, 1023, SCREEN_HEIGHT - 5, 15);

    // Draw line segment
    display.drawLine(i, y1, i + 1, y2, SSD1306_WHITE);
  }

  // Draw X-axis
  display.drawLine(0, SCREEN_HEIGHT - 5, SCREEN_WIDTH, SCREEN_HEIGHT - 5, SSD1306_WHITE);

  // Real-time volume indicator
  int meterWidth = map(peakToPeak, 0, 500, 0, SCREEN_WIDTH);
  display.fillRect(0, SCREEN_HEIGHT - 3, meterWidth, 3, SSD1306_WHITE);

  // Display threshold line (optional)
  display.drawLine(0, SCREEN_HEIGHT - 20, SCREEN_WIDTH, SCREEN_HEIGHT - 20, SSD1306_WHITE);

  display.display();
}

// Optional: Serial plot function
void serialPlot() {
  Serial.print("Wave:");
  for (int i = 0; i < dataSize; i++) {
    Serial.print(waveData[i]);
    Serial.print(",");
  }
  Serial.println();
  Serial.print("Peak:");
  Serial.println(peakToPeak);
}