* The esp8266 connects once a day to Internet to get time from NTP server
* To set WiFi parameters and advanced configuration WiFiManager library in SoftAP mode is used
* LDR is used to adjust clock display brightness according to ambient light
* Other alarm options are cycling LEDs, pulsing LEDs, full brightness of clock display, blinking clock display
* alarm on weekend is optional and has a separate alarm time setting
* if you like fall asleep with light, fade, fireplace and candles light effects are available
* the LEDs can be turned on and the intensity can be set by rotating the encoder
* the dim lighting and the fireplace or candles effect are nice not only for sleep
The screen is a very dark acrylic glass. The gray point below the display is a sticker used as screen for the D1 mini on-board LED.
The metallic part creates a `horizon` and reflection for the 'sunrise' and protects the LEDs
* the central LEDs are 3 yellow and one red. left and right block use 3 yellow LEDs each
* the fireplace effect has center LEDs slowly random pulsing in smaller PWM range and the left and right LEDs fast random pulsing at full PWM range. the 'fire' fades over falling asleep time.
* the candles effect uses slow random pulsing of left and right LEDs block at small PWM range
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