enable nightmode brightness at night

add some comments

src/Clock.cpp

@@ -10,6 +10,7 @@ Clock::Clock() : strip(NUMPIXELS, STRIPPIN, NEO_GRB + NEO_KHZ800), animator(), r
 
 void Clock::init() {
   strip.begin();
+  strip.setBrightness(DAYBRIGHTNESS);
 
   // initialize clock ticker
   turnOn();
@@ -42,10 +43,13 @@ void Clock::printWord(const std::vector<uint8_t>& word, uint32_t color) {
 void Clock::refreshTime() {
   // grab the current instant in unix seconds
   time_t now = time(nullptr);
+
+  // if not time is set (only seconds since start) start animation
   if (now <= 604800) {
     animator.startLoadAnimation(&strip);
     return;
   }
+
   animator.stopLoadAnimation();
   strip.clear();
 
@@ -54,6 +58,13 @@ void Clock::refreshTime() {
   const uint8_t hour = loctime->tm_hour;
   const uint8_t minute = loctime->tm_min;
 
+  // enable night brighntess at 21' and disable it at 6'
+  if (hour >= 21 || hour <= 6) {
+    strip.setBrightness(NIGHTBRIGHTNESS);
+  } else {
+    strip.setBrightness(DAYBRIGHTNESS);
+  }
+
   paintAlwaysOnLeds();
   setTime(hour, minute, this->twentyAfterSyntax, this->clockAlwaysOn);
 

src/Clock.h

@@ -16,6 +16,9 @@
 // define the esp pin the stip is attached to
 #define STRIPPIN D5
 
+#define DAYBRIGHTNESS 255
+#define NIGHTBRIGHTNESS 40
+
 class Clock {
  private:
   Adafruit_NeoPixel strip{};