Update more examples

examples/Analysis/FFT/FFT.ino

@@ -1,3 +1,16 @@
+// FFT Test
+//
+// Compute a 1024 point Fast Fourier Transform (spectrum analysis)
+// on audio connected to the Left Line-In pin.  By changing code,
+// a synthetic sine wave can be input instead.
+//
+// The first 40 (of 512) frequency analysis bins are printed to
+// the Arduino Serial Monitor.  Viewing the raw data can help you
+// understand how the FFT works and what results to expect when
+// using the data to control LEDs, motors, or other fun things!
+//
+// This example code is in the public domain.
+
 #include <Audio.h>
 #include <Wire.h>
 #include <SPI.h>
@@ -28,7 +41,7 @@ void setup() {
   // Enable the audio shield and set the output volume.
   audioShield.enable();
   audioShield.inputSelect(myInput);
-  audioShield.volume(0.6);
+  audioShield.volume(0.5);
 
   // Configure the window algorithm to use
   myFFT.windowFunction(AudioWindowHanning1024);
@@ -54,7 +67,7 @@ void loop() {
         Serial.print(n);
         Serial.print(" ");
       } else {
-        Serial.print("  -  ");
+        Serial.print("  -  "); // don't print "0.00"
       }
     }
     Serial.println();

examples/Analysis/MonoPeakMeterAnalog/MonoPeakMeterAnalog.ino

@@ -1,42 +0,0 @@
-/* Mono peak meter example using Analog objects. Assumes Teensy 3.1
-
-At a minimum DC decouple audio signals to/from Teensy pins with capacitors in the signal paths both in and out, 10uF is often used.
-Possibly worthwhile to set up virtual ground at 3v3/2 for both, or if changing DAC REF to 1.2V then 1.2V/2 for output side.
-
-This example code is in the public domain
-*/
-
-#include <Audio.h>
-#include <Wire.h>
-#include <SPI.h>
-#include <SD.h>
-
-AudioInputAnalog        audioInput(A0);         // A0 is pin 14, feel free to change.
-AudioAnalyzePeak        peak;
-AudioOutputAnalog       audioOutput;            // DAC pin.
-
-AudioConnection c1(audioInput,peak);
-AudioConnection c2(audioInput,audioOutput);
-
-void setup() {
-  AudioMemory(4);
-  Serial.begin(9600);
-}
-
-// for best effect make your terminal/monitor a minimum of 31 chars wide and as high as you can.
-
-elapsedMillis fps;
-
-void loop() {
-  if (fps > 24) {
-    if (peak.available()) {
-      fps = 0;
-      uint8_t monoPeak = peak.read() * 30.0;
-      Serial.print("|");
-      for (uint8_t cnt=0;cnt<monoPeak;cnt++) {
-        Serial.print(">");
-      }
-      Serial.println();
-    }
-  }
-}

examples/Analysis/PeakMeterMono/PeakMeterMono.ino

@@ -0,0 +1,45 @@
+/* Mono Peak Meter
+
+   Scrolling peak audio level meter in the Arduino Serial Monitor
+
+   Audio input needs to connect to pin 16 (A2).  The signal range is 0 to 1.2V.
+   See the documentation in the Audio System Design Tool for the recommended
+   circuit to connect an analog signal.
+
+   This example code is in the public domain
+*/
+
+#include <Audio.h>
+#include <Wire.h>
+#include <SPI.h>
+#include <SD.h>
+
+// GUItool: begin automatically generated code
+AudioInputAnalog         adc1;           //xy=164,95
+AudioAnalyzePeak         peak1;          //xy=317,123
+AudioConnection          patchCord1(adc1, peak1);
+// GUItool: end automatically generated code
+
+
+void setup() {
+  AudioMemory(4);
+  Serial.begin(9600);
+}
+
+// for best effect make your terminal/monitor a minimum of 31 chars wide and as high as you can.
+
+elapsedMillis fps;
+
+void loop() {
+  if (fps > 24) {
+    if (peak1.available()) {
+      fps = 0;
+      int monoPeak = peak1.read() * 30.0;
+      Serial.print("|");
+      for (int cnt=0; cnt<monoPeak; cnt++) {
+        Serial.print(">");
+      }
+      Serial.println();
+    }
+  }
+}