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Overview This bulbdial clock is a modified version where 72 LEDs were charlieplexed to produce an arrow represented by a shadow which points to the numbers on a dial. Explanation There are 12 LEDs on the hour and 30 LEDs each on the second and minute rings. Every two seconds, the clock changes by fading between positions which makes the movement of the clock easy to see in real time. The enclosure used consists of iridescent pearl, black-flecked granite, and tortoise shell to create some amazing plastics. A high accuracy chip DS3231 with built-in temperature-compensated crystal oscillator for real time clock module is used along with a backup battery. The regular clock CPU is required if no RTC is detected. The CPU runs on an external 20ppm quartz crystal which is slightly more accurate by having 20 parts per million when at room temperature. A regular ISP programmer can be used to program the kit or through the USB-TTL cable. Through the bootloader cable, the programming is safe wherein the fuses or bootloader cannot be overwritten while setting the lock bits to standard Arduino values. The unrecoverable fuses can be set in several potential ways available. Rest of the project
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