4 ms·
That's a nice thing to build, but is having such an accurate clock source at home actually useful for anything?
by turminal 5y ago
That's a nice thing to build, but is having such an accurate clock source at home actually useful for anything?
- newman314 5y agoNot specifically other than having a cool toy. However, I'm doing research into being able to turn this into a short range WWVB transmitter as I like radio clocks but my area does not get good reception. So I suppose, there's an ultimate end goal there.
- ggm 5y agohttps://github.com/hzeller/txtempus https://github.com/hzeller/txtempus I made one for my Citizen RF synced watch. It works.
- newman314 5y agoLOL, I already have your repo starred previously. Awesome that you are on HN, I may reach out at some point whenever I actually find time to play with this.
- ggm 5y agoThat's not my repo. To be clear. I followed this guys methodology, and can confirm it works. It's his work not my work.
- scottlamb 5y agoI don't know who needs this kind of precision, especially on a Pi. But there's often a need to improve on the Pi's sucky out-of-the-box time experience. It doesn't have a battery-backed real-time clock. After a power outage, it will boot with time that's hours behind and then step the clock after the network becomes available. So a nice middle ground is to buy a separate RTC and attach it via the I2C GPIO pins. The modules are ~$10 including shipping. I wrote up the software setup recently here: https://github.com/scottlamb/moonfire-nvr/wiki/System-setup#realtime-clock-on-raspberry-pi https://github.com/scottlamb/moonfire-nvr/wiki/System-setup#...
- Johnny555 5y agoProbably useful if you're in an area without reliable internet service, so you can have an accurate time source without internet. Most people probably don't require a high accuracy stratum-1 timesource for home, but for $100, why not?