Mic arduino files

arduino/Mic/Mic.ino

@@ -0,0 +1,41 @@
+const int sampleWindow = 50;  // Sample window width in mS (50 mS = 20Hz)
+int const AMP_PIN = 7;       // Preamp output pin connected to A0
+unsigned int sample;
+
+void setup()
+{
+  Serial.begin(9600);
+}
+
+void loop()
+{
+  unsigned long startMillis = millis(); // Start of sample window
+  unsigned int peakToPeak = 0;   // peak-to-peak level
+
+  unsigned int signalMax = 0;
+  unsigned int signalMin = 1024;
+
+  // collect data for 50 mS and then plot data
+  while (millis() - startMillis < sampleWindow)
+  {
+    sample = analogRead(AMP_PIN);
+    if (sample < 1024)  // toss out spurious readings
+    {
+      if (sample > signalMax)
+      {
+        signalMax = sample;  // save just the max levels
+      }
+      else if (sample < signalMin)
+      {
+        signalMin = sample;  // save just the min levels
+      }
+    }
+  }
+  peakToPeak = signalMax - signalMin;  // max - min = peak-peak amplitude
+  if (peakToPeak == 4294966272){
+    peakToPeak = 0;
+  }
+  Serial.println(peakToPeak);
+  //double volts = (peakToPeak * 5.0) / 1024;  // convert to volts
+  //Serial.println(volts);
+}