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.

Beaglebone Cape for NS-T, revision 2

I'm testing the second revision of this cape now. Schematic is on github [https://github.com/ddrown/NS-T-BBB-Cape] (left: rev1, right: rev2) It's working much better than rev1, but time will tell if it has the same frequency dropouts. I've also published the NTP

Update on Beaglebone Cape for Navspark NS-T

The cape [https://blog.dan.drown.org/beaglebone-cape-for-navspark-ns-t/] has been running for 5 days now. I've been tweaking the system to see if I can get it stable. So far, the local clock looks like this: The red line shows the clock offset. When things are working properly,

Beaglebone Cape for Navspark NS-T

Goal My next goal in the quest for a better NTP server is to improve the TCLKIN source. Previously, I was experimenting with TCXO's. I bought a Navspark NS-T (a timing-grade GPS receiver) and designed an adapter cape for it. This is my first time designing a circuit

TCXO + Beaglebone Black, part 2

Starting from the previous TCXO modification [https://blog.dan.drown.org/tcxo-beaglebone-black/], I wanted to get a 24MHz TCXO working. Trial #1 I bought a set of three undocumented 24MHz TCXO's off ebay for $6. I was hoping that since they were not SMD parts, they would be