allow disabling serial, add missing comments

Signed-off-by: dragonchaser <christian@boltares.de>

btcontrol.ino

@@ -31,8 +31,8 @@ void Vibrate();
 
 // LED configuration
 #define LED_TYPE    WS2812B
-#define LED_DATA_PIN 21
-#define LED_NUM_LEDS 1
+#define LED_DATA_PIN 21 // use 1 for GPIO 1 and 21 for builtin
+#define LED_NUM_LEDS 1  // use 1 for builtin and whatever your count is for extern
 #define LED_COLOR_ORDER GRB // USE GRB for the onboard led and RGB for the chain
 
 #define LED_BRIGHTNESS          96
@@ -59,6 +59,8 @@ void Vibrate();
 // TODO: add a table here that defines distance in meters for scenarios where the device is in plain sight
 #define MIN_RSSI_POWER -50
 
+#define USE_SERIAL false
+
 // CONSTS
 const std::map<String, String> overrideColors = {
     {"36E898", "FF0000"}, // MiiBand Klaas
@@ -180,7 +182,9 @@ class AdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
 };
 
 void setup() {
-  Serial.begin(115200);
+  if (USE_SERIAL) {
+    Serial.begin(115200);
+  }
   
   if (useVibro) {
     pinMode(VIBRO_PIN, OUTPUT);