A digital quartz clock from scratch

Erik van Zijst writes about the design of a 24-hour digital quartz clock with self-dimming LED display:

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A digital quartz clock from scratch

After 20+ years of programming, I wanted to get some understanding of the electronics that make my career possible.

I had built the basic individual logic gates with transistors on a breadboard, but to build anything meaningful I needed loads of them and so I bought a somewhat random collection of logic chips on Amazon which introduced me to the 7400-series and the concept of datasheets.

After a few simple projects I wanted to build something more useful: a quartz clock with LED display.

Here is a video of the clock:

The board is shared on OSH Park.

 

A digital quartz clock from scratch

Raspberry Pi Zero W desk clock

Nick Sayer created a LED desk clock driven by NTP on a Raspberry Pi Zero W:

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Raspberry Pi Zero W desk clock

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
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Raspberry Pi Zero W desk clock

Chronio DIY Watch

 writes on Hackaday:

Chronio DIY Watch: Slick and Low Power

[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

Chronio DIY Watch

GPS Clock by Nick Sayer

Nick Sayer created this simple desk clock that gets time from GPS:

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GPS Clock

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:

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Nick has hacked together a tenth digit for the clock:

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Here is a video of the GPS clock in slow motion:

 

GPS Clock by Nick Sayer

Arduino Pro Trinket Bubble Display

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davedarko wrote in his LED displays on Arduinos – a collection project log on hackaday.io:

Arduino Pro Trinket – bubble display

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

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The design files are available on GitHub:

davedarko has shared the board on OSH Park:

ProTrinket Bubble Display shield

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Order from OSH Park

Arduino Pro Trinket Bubble Display