Add checking of commands and acting on them

docs/source_files/week_4/first-program/first-program.ino

@@ -30,11 +30,11 @@ void loop() {
     // Blink the NeoPixel
     pixels.clear(); // Set all pixel colors to 'off'
     // We only have one pixel, therefore the first argument (index) is 0
-    pixels.setPixelColor(0, pixels.Color(25, 25, 205)); // Nice blue color
+    pixels.setPixelColor(0, pixels.Color(25, 25, 180)); // Nice blue color
     pixels.show(); // Send the updated pixel colors to the hardware.
     delay(DELAYVAL); // wait between
     pixels.clear();
-    pixels.setPixelColor(0, pixels.Color(180, 180, 25)); // Nice yellow color
+    pixels.setPixelColor(0, pixels.Color(150, 150, 25)); // Nice yellow color
     pixels.show();
     
   } else {
@@ -49,10 +49,20 @@ void loop() {
   
   delay(DELAYVAL);
 
-  String test_str; // Initialize the variable
+  
   if (Serial.available() > 0) { // If there is incoming bytes in the serial:
-    test_str = Serial.readString(); // This reads the serial buffer to a String
+    String input_str = Serial.readString(); // This reads the serial buffer to a String
+    input_str.trim(); // remove any \r \n whitespace at the end of the String
     Serial.print("You wrote: ");
-    Serial.println(test_str); // Send it back to see if this works
+    Serial.println(input_str); // Send it back to see if this works
+
+    // Set the boolean accordingly
+    if (input_str == "blink") {
+      Serial.println("Ok, blinking");
+      blinking = true;
+    } else if (input_str == "stop") {
+      Serial.println("Ok, stopping");
+      blinking = false;
+    }
   }
 }