What is a second? And what does that have to do with the Raspberry Pi CM4 and IEEE1588-2008? And why should you care?

Support me on Patreon: https://www.patreon.com/geerlingguy
Sponsor me on GitHub: https://github.com/sponsors/geerlingguy
Merch: https://redshirtjeff.com
2nd Channel: https://www.youtube.com/c/GeerlingEngineering

Mentioned in this video:

  - My original Time Card video: https://www.youtube.com/watch?v=tU0xC1ynaT8
  - Why is this PCIe Card RADIOACTIVE? (LTT): https://www.youtube.com/watch?v=JK3eTGkX6qY
  - Time Card (a bit pricey, but if you want it preassembled...): https://store.timebeat.app/products/ocp-tap-timecard
  - Time4Pi module (not yet for sale): https://store.timebeat.app/products/gnss-raspberry-pi-cm4-module
  - New US Time Standard - NIST-F2 (NIST): https://www.youtube.com/watch?v=z-jE7DXy1x0
  - How the Tweezer Clock Works (NIST): https://www.youtube.com/watch?v=TIvqQfl9lNs
  - GPS III - Focused on the Future (Lockheed Martin): https://www.youtube.com/watch?v=uYeMP35F7aE
  - How does Britain know what time it is? (Tom Scott): https://www.youtube.com/watch?v=yqciKS_N0K8
  - WWV Video Tour (ShutterMafia): https://www.youtube.com/watch?v=XJewUiP0Ueo
  - Meinberg IMS Series clocks: https://www.youtube.com/watch?v=xtu9AzasEqo

#RaspberryPi #PTP #TimeCard

Contents:

00:00 - What is a second?
00:32 - Time is too expensive
01:29 - PPS and WWV
02:56 - PPS on the Pi CM4
04:19 - Precision Time Protocol
06:09 - PTP Demo
08:16 - A radioactive PCIe card
10:35 - CM4's time has come
12:21 - How important is time?
13:27 - A Time Server for your Homelab?