This is my alarm clock, so I can put in the features that I want:
- NTP-synced time. Never forget about DST again. Always accurate.
- Wakeup by ocean light, with a 1-hour brightness ramp-up.
- Capacitive touch-sensitive override - snooze if I want to, just touch the jar
- 1-hour red-light sleep timer for going to bed
- Cool patterns during the day
- Over the air (OTA) firmware updates
- An esp8266 (Wemos W1 Clone)
- 5 WS2812 LEDs
- 1 50M ohm resistor
Wakeup / Sleep Time Algorithm
I decided I only needed two different wakeup times, one for weekedays, one for weekends.
If you would like to see a fancier light alarm clock with a web interface to set custom alarms, check out this soothing alarm clock.
Capacitive Touch Sensor
The Sunjar is just a heavily frosted mason jar and it has a stainless steal rim. By connecting this rim to particular pins on the microcontroller, I can use the rim as a capacitive touch sensor, detecting when humans touch the jar.
The electrical schematic for this is extremely simple, requiring only two pins and a resistor:
My code easy to write thanks to a library that handles the hard parts.
This touch sensor serves to override the lamp, for when I want to sleep early, use it as a night light, or need to snooze in the morning.
A Love Letter to “Pacifica”, the ocean pattern
“Pacifica” is the name of the ocean pattern. It powers the wakeup mode (with the ocean-inspired palette) as well as the sleep mode (with a fire-inspired palette):
Its beauty comes from its complexity and depth. There are four simultaneous “waves” intersecting each other with extra effects for darker hues and whitecaps.
- I think eventually I will want an easier way to change the alarm times
- Maybe I can make the touch sensor detect long holds or double taps for more interesting commands
- Synchronized color schemes for special events copied from a different project