We have no idea if the background story is true or not, but we’re not going to let something like “truth” get in the way of a good story. The way [Kwan3217] tells it, first there were hours on sundials. Then when these were divided into sixty minute sections, they were called “minutes”. “Seconds” comes…
Nick Sayer created a LED desk clock driven by NTP on a Raspberry Pi Zero W:
When I was in college, I bought and built a Heathkit GC-1000 WWV clock. Since then, I’ve been somewhat interested in accurate time measurement. I recently designed a GPS driven clock, but sometimes your local WiFi reception is better than GPS (say, indoors). For those circumstances, a clock that gets time from NTP over WiFi would be preferable. The newly released Raspberry Pi Zero W makes this quite a bit simpler to achieve
Elliot Williams writes on Hackaday:
[Max K] has been testing the battery life of his self-designed watch under real-world conditions. Six months later, the nominally 3 V, 160 mAh CR2025 cell is reading 2.85 V, so the end is near, but that’s quite a feat for a home-engineered smart watch
Nick Sayer created this simple desk clock that gets time from GPS:
GPS is best known as a ubiquitous, accurate positioning system (obvious from the name), but the way it actually works requires distributing hyper-accurate time information. This makes it possible (and, actually, pretty easy) to make a clock that you never have to set as long as it gets good GPS reception.
Yes, this is way overkill… but GPS is getting so cheap that you might as well.
The source code is available on GitHub:
Nick has hacked together a tenth digit for the clock:
Here is a video of the GPS clock in slow motion:
With 4 of HP QDSP-6064 bubble displays in a drawer I felt ready to do something with them and the “Clocks for Social Good” – call on hackaday.com finally got me going
The design files are available on GitHub:
davedarko’s mum gave him some small jam jars and it inspired him to design this clock:
30ml jam jars hopefully turned into beautiful LED displays – nixietube like looking without the higher voltage fuzz – fake LED nixietubes
The design files and source code are available on GitHub:
Here’s a video of the clock in action:
- LUMEX 3″ 7-Segment Displays
- 3″ LCD Clock – Part I
- 3″ LCD Clock – Part II
- 3″ LCD Clock – Part III
- 3″ LCD Clock – Part IV
- 3″ LCD Clock – Part V
I picked up these sweet LUMEX S101D22TR 7-Segment LCDs the other day.
The PCBs for the hours, minutes, and seconds display modules are identical. They’ll just be wired differently.
On the driver boards, data flows in from the left out to the next section on the right.
The source files can be downloaded from: