- Buy or build a clock enclosure.
- Follow the schematic here to build the circuitry, 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 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 (which may take until nightfall in noisy radio-frequency environments far from its origin in Colorado), 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.