Check out chris101’s designs for a couple homemade clocks originally posted on the Forums!

Stopwatch with hundredth second precision, using a 3V trinket pro, battery charger backpack, 128 x 64 oled, chronodot, assorted switches, resistors capacitors and a 10K pot. The lens gives it a bit of Jules Verne appeal.

I love seeing the sketch/schematic of the design of this clock:

This master “atomic” clock only has a few Adafruit parts, but they are essential (the chronodot and 128×32 oled), an Arduino Micro, the guts to a wwvb radio clock, some high brightness colored LEDs, a quad opamp, a bunch of vintage resistors, capacitors and other hardware. The hours, minutes and seconds are sent via a littleBits wireless device to several slave clocks.

Readers have been posting their designs here in the forums since 2010.