Dan Drown

RTC comparison

Real Time Clocks I bought two high accuracy RTC (real time clock) modules and wanted to compare them. RTCs are useful for very low power clocks. They can run for years off of a coin cell battery. Both of these modules are special in they claim higher accuracy than your

Turris Omnia

My Turris Omnia arrived today! LED colors based on Network Traffic Video of it in action: https://youtu.be/bMkGp54xWqQ Forum post: https://forum.turris.cz/t/led-color-based-on-bandwidth-usage/1262 Blinky Lights The RGB LEDs can be controlled by sysfs, the "A" and "B" ones are available

stm32f030 devboard with TCXO

I'm interested in making a high accuracy real time clock (RTC). To experiment with the hardware I need for that, I created a development board based on the STM32F030F4P6 (which is a 20-TSSOP package) and a TCXO. I chose that STM32 for two reasons: one, because it'

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