A visual clock that lights up when it is ok to wakeup. Made from a cheap esp8266 dev board and an old rabbit lamp toy. Cost is minimal (5€) compared to some commercial product you can find on amazon (25-50€).
Programming the ESP :
This cheap plastic light was holding an LED and a coin cell, you have to gut the bunny, sorry :
Plenty of room to insert an ESP :
Onboard LEDs are more than enough to shine through the plastic toy :
Todo :
- Blink leds until wifi is connected and NTP time aquired.
- Add a web interface for editing times
There are several good NTP librairies and i used the one from : https://github.com/arduino-libraries/NTPClient .