Crystal Binary Clock
This is a binary clock I made for my girlfriend’s birthday. It uses 6 jumbo red LEDs which illuminate quartz crystals to display the minutes in binary. Two servo motors are used in the bottom half to display AM/PM and the hour. All of this is controlled with a PIC16F690 microcontroller assembled on a breadboard.
The clock does not use any sort of timekeeping chip or even an external crystal for the microcontroller, so it relies on the internal RC oscillator and tends to lose a few minutes each day. There are only two buttons on the clock, an “IM” button (increase minutes) and “DM” (decrease minutes) which allows the time to be set/adjusted as needed.