Check out this great “doomsday” clock project shared on the Adafruit Forums — with as many sources for accurate time and place as you could hope for! As the sources to keep this clock accurate go down, the person reading the clock knows that it is time to hit the bunkers and prepare for the end of the world. Check out the list further down for all of the awesome Adafruit gear used for this project, and read just below for notes from the Doomsday Atomic Alpha Clock Five project page:
I wanted a clock that would display precision time and date in “all” worst case scenarios.
If this clock does not show the precise time then its time to gather up food, water, ammunition,
and the family and head for the underground bunker!
This could happen – imagine this scenario ….
The World Wide Web (Internet) goes down.
All the US Military global positioning satellites (GPS) stops working.
The 60Khz WWVB pulse radio towers (Atomic clock) at Fort Collins, Colorado cease operation.
The electrical power grid cease to function.
All cellphone towers are in-operational.
All POS telephone land lines stop functioning.
All TV and cable systems are in-operational.
It’s the end of civilization … Doomsday! Do you have the precision time and date?
I may be dead and long gone but my Doomsday Atomic Alpha Clock Five would be still functional, working and indicating the precision time!
In this project, we used a GPS, a WiFi Electric IMP (network time), a custom built WWVB Atomic radio receiver, two precision TXCO real time clocks (+- 2 PPM SPI DS3234 and I2C DS3232) and two micro controllers – (Teensy 3 ARM stamp & Arduino 328P clone). We then use the three precision clock sources (UNIX seconds) to drive or sync to the Evil Mad Scientist huge, very bright, “Alpha Clock Five” 2.5″ clock display.
And here is the list of Adafruit gear involved and further details about this project:
- Alpha Clock Five kit
- LCD I2C shield with 5 tact switches replaced by tact joystick (hacked or modified)
- RGB backlight negative LCD 20×4 (modified to fit 2×16 LCD shield)
- Ultimate GPS (modified-remote mounted fix LED)
- +5 VDC to 3 VDC level converter (for I2C LCD)
- INA219 High Side DC Current Sensor Breakout
- Electric IMP SD WiFi card (modified for network time and status)
- Tact joystick (modified for LCD display)
- CR2032 battery holder(s) (Standardize battery holder for all lithium backups)
- Spring loaded terminal blocks for 5 V bus bar
- Protoboard for 5 V bus bar
- Panel mount power connector 2.1 mm
- Teensy 3 ARM Stamp
In our “DoomsDay Atomic Alpha Clock Five Project” we used a Ultimate GPS, a WiFi Electric IMP (network time), a WWVB Atomic radio receiver, two precision TXCO real time clocks (+- 2 PPM SPI DS3234 and I2C DS3232) and two microcontrollers – (Teensy 3 ARM stamp & Arduino 328P clone). We then use the three precision clock sources (UNIX seconds) to drive or sync to the Evil Mad Scientist huge, very bright, “Alpha Clock Five” 2.5″ clock display.