Build an Atomic Clock
Time: 2 Hours
Difficulty: Hard
- Buy or build a clock enclosure.
- Follow the schematic to build the circuitry (download it from here), and attach the real-time clock and WWVB modules to the auxiliary circuit board. Connect leads to the Arduino pins as you go.
- Wire the connections between the Arduino and the display. We used a 16-character, two-line LCD.
- Download the software here and program the Arduino.
- Set the dip switches to indicate your time zone.
- Fire up the circuit. When the receiver pulls in the WWVB signal, the display will update to the correct time and indicate that the adjustment has been made. The front-panel light will blink in time with each pulse received and decoded, once per second when all is working properly.
—Vin Marshall
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