added some comments

Abstandssensor.ino

@@ -3,26 +3,26 @@
 #include <NeoPixelAnimator.h>
 #include <NeoPixelBrightnessBus.h>
 
-
-// DEV or PROD Setup
-#define DEBUG
-
 // Only for ESP8266 D1 Mini
-#define ECHO 5    // D1
-#define TRIG 16   // D0
+#define ECHO 5      // D1
+#define TRIG 16     // D0
 #define POTI_IN 17  // A0, analog In
 
+
+// Set Data pin for LED ring (we use GPIO3, which is also RX of the serial line)
 #define DATA_PIN 3
 const uint16_t PixelCount =  8;
 NeoPixelBus<NeoGrbFeature, NeoEsp8266Dma800KbpsMethod> strip(PixelCount, DATA_PIN);
 
-long duration;  // Variable um die Zeit der Ultraschall-Wellen zu speichern
-float distance; // Variable um die Entfernung zu berechnen
+long duration;  // here we measure the time needed by the ultrasonic pulse
+float distance; // the calculated distance
 
-int poti;
-int percent=0;
-int colorSaturation=255;
+int poti;       // used to adjust the distance for yellow/red
+int percent=0;  // will be used to calculate the current percentage of the distance reached
 
+int colorSaturation=255;  // max color saturation for the colors (=brightness)
+
+// define some colors we use later
 RgbColor red(colorSaturation, 0, 0);
 RgbColor green(0, colorSaturation, 0);
 RgbColor yellow(colorSaturation, colorSaturation, 0);
@@ -32,12 +32,13 @@ RgbColor black(0);
 
 void setup() {
 
+  // Setup the ultrasonic sensor PIN
   pinMode(TRIG, OUTPUT);  // TRIG-Pin: Output
   pinMode(ECHO, INPUT);   // ECHO-Pin: Input
 
-  #ifdef DEBUG
+  // Important to first initilizate Serial before the strip as
+  // we are useing the RX PIN to connect the strip
   Serial.begin(9600);   // Baudrate: 115200
-  #endif
  
   // this resets all the neopixels to an off state
   strip.Begin();