A programmable red-light/green-light alarm clock for ESP8266 (built on NodeMCU devkit) with configuration, time synchronization, and overrides via WiFi.

Functional highlights:

• Default connection to a WiFi network, with fallback to broadcasting its own SSID (great for travel away from your home network)
• NTP synchronization with default (but configurable) timezone offset
• Once alarm time is reached, the light stays green until the clock is reset
• Any state (red, yellow, green, off) can be selected manually from the UI

To use:

• Change the configurables based on your wiring to LEDs. Compile & upload to the board
• On first load, it will fail to connect to a wifi network and will broadcast its own ("LightClock" SSID, unless you changed it). Connect to that network and load http://192.168.4.1
• You can configure it for your WiFi SSID and PSK on that page.
• When it connects, either use the Serial readout or it flashes LEDs (red = 100s place, yellow = 10s, green = 1s) to give you the last octet of the IP. All LEDs on = SoftAP mode
• Pull the page up (http://) in a browser - tested in Chrome & Safari mobile
• If needed, you can change the timezone offset or manually reset the clock (if it's connected to a network without NTP access, like its own) at the bottom
• Set the alarm by entering a 24hr time, no seconds ("6:00") in the alarm box, and mash the button
• Use the color buttons for overrides. Any color button disables the alarm functionality