Dan Drown

GPS PPS drift when it has no signal

Question: What happens to a GPS receiver's pulse per second (PPS) when it loses signal for a long time? To answer this, I first moved the antenna away from the window and put it in an anti-static bag. I did this on the 16th at 01:02 GMT.

Getting Fedora Server running on the Utilite Standard

I installed the Fedora ARM Server image on a Utilite Standard [http://utilite-computer.com/web/utilite-models] (which is based on a dual-core Freescale iMX6 1GHz). Not everything is working, but these are my notes. download the Fedora ARM Server image from https://arm.fedoraproject.org/ There are installation instructions at

Binary Clock, Update 3

I've made some progress on my binary clock project Here's a video of it in its new case: https://www.youtube.com/watch?v=VnHRYwOf2ZQ I've been tweaking the clock controller code and experimenting with different setups to see how the code reacts. First

Binary Clock, update 2

This is an update on my binary clock project. Click here for the previous post [https://blog.dan.drown.org/binary-clock/] I've been working on a PID controller [https://en.wikipedia.org/wiki/PID_controller] to adjust the local clock's rate. Right now, it's

binary clock

I've been working on a clock that gets its time from the internet and has a binary display. It should use NTP to keep its clock within tens of milliseconds of true time. It should automatically adjust for daylight savings time. It should keep an estimate of the

wifi christmas lights

Color Changing Christmas Lights I like the idea of a string of lights controlled by wifi. It's an internet of lights (IoL)! Other people's projects Other people have created neat things with related hardware (bluetooth and RF models): Replacing the controller with something custom [http://www.

SB6183 dropping IPv6 traffic

TL;DR - The Arris SB6183 cable modem is dropping IPv6 TCP traffic with the timestamp TCP option. See the "Workarounds" section for possible workarounds. 13 months later (October 2016), my modem was updated to D30CM-OSPREY-1.5.2.3-GA-01-NOSH. IPv6 tests show this problem is fixed with this

Decoding WWVB, part 2

I worked on detecting the timing information from the WWVB signal. Being able to locate the start of the second is important because it is the clock the data is encoded against. I have a few recordings of WWVB I'm testing against, and I started with the lowest

Decoding WWVB

I've been playing with decoding WWVB. I have a random wire [https://en.wikipedia.org/wiki/Random_wire_antenna] antenna connected to my sound card's line in jack. The sound card is a Realtek ALC1150 built into the motherboard and can do 192ksamples/second. I'

Fedora-based router with DHCPv6-PD support

I threw together some hardware I had on hand to make a PC-based router. IPv4 Getting IPv4 working was easy, I just needed to set ZONE=external and ZONE=trusted on the wan/lan interface ifcfg-* files. I threw net.ipv4.ip_forward=1 in /etc/sysctl.conf as well.