Adding Serial Control to Microphone Test

Author: plancherb1

examples/test_microphone/test_microphone.ino

@@ -12,6 +12,7 @@ short sampleBuffer[256];
 volatile int samplesRead;
 
 bool record = false;
+bool commandRecv = false;
 
 void setup() {
   Serial.begin(9600);
@@ -28,7 +29,7 @@ void setup() {
   }
 
   Serial.println("Welcome to the microphone test for the built-in microphone on the Nano 33 BLE Sense\n");
-  Serial.println("Use the on-shield button to start and stop an audio recording");
+  Serial.println("Use the on-shield button or send the command 'click' to start and stop an audio recording");
   Serial.println("Open the Serial Plotter to view the corresponding waveform");
 }
 
@@ -39,15 +40,33 @@ void loop() {
     record = !record;
   }
 
-  if (samplesRead) {
+  // see if a command was sent over the serial monitor and record it if so
+  String command;
+  while (Serial.available()) {
+    char c = Serial.read();
+    if ((c != '\n') && (c != '\r')) {
+      command.concat(c);
+    } 
+    else if (c == '\r') {
+      commandRecv = true;
+      command.toLowerCase();
+    }
+  }
+
+  // parse the command if applicable
+  if (commandRecv && command == "click") {
+    commandRecv = false;
+    record = !record;
+  }
 
+  // display the audio if applicable
+  if (samplesRead) {
     // print samples to serial plotter
     if (record) {
       for (int i = 0; i < samplesRead; i++) {
         Serial.println(sampleBuffer[i]);
       }
     }
-
     // clear read count
     samplesRead = 0;
   }