Microsecond Accurate NTP using PPS signals from a $12 GPS

I accidentally got a module that didn't have PPS broken out to a pin, but it did have an LED. I was able to tack a wire to the LED's resistor and brought that over to the Pi. It's working great, but I know what to watch for if I get another GPS module.

Question, sir: what would it look like if you used the WWVB long wave radio broadcast as your time source? Your help would be greatly appreciated.

Hey Austin, got the stuff in to get PPS set up. Is there any reason for pps_core to not show up when I run `lsmod | grep pps`? I have the first line, as this: ~ $ lsmod | grep pps
pps_gpio 16384 0. Any idea what I need to do to fix? FWIW, it doesnt seem to make a difference as I am getting great PPS accuracy. I just wondered if maybe tyhere is something I would need to do to correct that. Looking again after completeing the tutotrial, I see this now: pps_ldisc 16384 2
pps_gpio 16384 2. I dunno.

Do you know of a way to actually display the time with high accuracy ?
Looking at it through the terminal, the network jitter is not controlled an the frame rate is very low, less than 10Hz.
I'm trying to display accurate time to at least millisecond on every frame, so at minimum 60 FPS and hopefully more in the future.

I was trying to use this as a NTP server for my local network, but it seems like it will not work without one external NTP server lookup. My local ISP is having an issue with NTP traffic that they are still looking into. Any thoughts on forcing chrony to use PPS only?

Much better than those without the 1PPS synchronization. Well done.

Can anybody suggest a method to implement the same on RockPi

I tried various videos and tutorials over the last two weeks to get my RPi3, Chrony and Adafruit GPS talking without success. I came across your video tutorial and written article, and was up and running in a very short time. Thank you so much, both the video and the article have been an invaluable resource. I was about to give up 😊

Dope

Great video Austin! Thanks!