I made some progress with building my led clock.Â In the video you can see 80 74hc595 shift registers driving 80 7 segment led displays. The bottom row works, but has no data yet to display. You can see: unix timestamp, day of week, weeknumber, date, new earth time, swatch internet time, hexadecimal time, French revolution decimal time, approximate local solar time and local time.
I am busy testing a modular 7-segment led clock. Each module can contain up to 3 pieces of 7-segment led displays driven by a 74HC595D shift register. Modules can be combined into larger strings.
In the video the modules are driven by an Arduino Nano 3.0 using the SPI interface. Continue reading