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"category:/tech"

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Title and summary Date/time
1
Bash Shellshocked Bug Of Doom
The intertubes are currently ablaze with the news of the Bash Shellshocked bug, with the usual glut of misinformed commentary through to apocalyptic doom-mongering. What I haven't seen mentioned is that there's a relatively straightforward workaround ...
26-Sep-2014
14:59:00
2
Merging Mercurial repositories
A quick note because if I ever need to do this again I know I'll have forgotten how :-) I had three Mercurial repos that were parts of the same thing, a web-based browser/searcher for engineering documents at work. The three parts were all NetBeans ...
19-Apr-2014
17:08:10
3
Driving the WS2811 at 800KHz with a 16MHz AVR
Recently some of the folks at the Manchester Hackspace did a bulk-order of WS8211 LED pixels. These are available from several vendors on aliexpress.com (search for "WS2811 5050 RGB") and they combine a 5050 RGB LED with a WS2811 driver chip. The WS2811 ...
02-Dec-2012
20:52:00
4
Sensor smoothing and optimised maths on the Arduino
As part of my attempt to load as much as possible onto an Arduino, I added a LIS302DL accelerometer into the mix and used the Y axis output to drive a strip of LEDs via a couple of TLC5916 LED drivers. I was sampling the accelerometer every 10msec and ...
20-Jun-2012
08:36:17
5
AVR performance monitoring using the OpenBench Logic Sniffer
Now I've ditched the Arduino platform I wondered just how much 'juice' I could squeeze out of a 16Mhz ATMega328P, as used in the Arduino Duemilanove. According to Atmel it should be capable of around 16 MIPS, which puts it ahead of a 1985-vintage Intel ...
06-Jun-2012
22:24:00
6
Mio 687 satnav - a review
I bought a Mio 687 satnav for my wife at Christmas and I must say it's been a great disappointment. It fares very badly in comparison with the free satnav that's on my now ancient Nokia E71. Here's a list of the reasons I think you should avoid the Mio ...
03-Jun-2012
20:34:00
7
Why I'm ditching the Arduino software platform
I'm getting set up for my next project and decided to update my development environment. I've finally decided to entirely ditch the Arduino software environment and just use the boards. I stopped using the Arduino IDE some time ago, but now I'm going ...
29-Feb-2012
20:50:00
8
Scala snippet of the day
The following is useful for benchmarking code from inside the REPL: def timed(op: => Unit) = { val start = System.nanoTime op (System.nanoTime - start) / 1e9 } Then you can use it like this: scala timed { Thread.sleep(5000) } res0: Double = ...
17-Feb-2012
14:04:00
9
Stupid BT router...
I have the misfortune to own a BT Business 2Wire router, and bleaklow.com sits behind that. A while back it threw a fit and reconfigured itself and when I beat it into submission I didn't notice that it had also lost the port mappings for bleaklow.com. ...
23-Nov-2011
14:12:00
10
Hints on creating 256-colour themes for vim
Most existing vim colour themes are designed for the graphical version of vim, gvim. They don't work properly at all if you are running vim in a terminal, and there are very few themes available for vim in terminal-mode. You are pretty much obliged to ...
21-Sep-2011
21:06:00
11
Beautiful Scala
This is, of course, beautiful: def msort[T](less: (T, T) = Boolean) (xs: List[T]): List[T] = { def merge(xs: List[T], ys: List[T]): List[T] = (xs, ys) match { case (Nil, _) = ys case (_, Nil) = xs case (x :: ...
23-Aug-2011
09:24:23
12
Childhood autism spikes in geek heartlands
From the New Scientist: Childhood autism is two to four times as common in Eindhoven, the centre of the Dutch information technology industry, as it is in two comparably sized Dutch cities with far fewer IT employees. The result supports the ...
24-Jun-2011
12:10:15
13
A mention on the Pragmatic Programmer
I was looking at my Google Analytics and noticed I was getting referrals from the Pragmatic Programmer site, specifically from an article in the April magazine issue entitled Advanced Arduino Hacking. Turns out they were using my Makefile.master as the ...
08-May-2011
15:01:41
14
ATMega registers and memory ranges
The AVR family has a reasonably complex register and memory architecture, with: Multiple address spaces Registers that can be accessed directly and via the memory address space Register pairs that are used as memory indexes Restrictions on which ...
10-Apr-2011
17:28:50
15
EletroAxé with Carlinhos Brown
Carlinhos Brown is a colossus in Brazilian music, known not only for his solo musical career but also for the founding of Timbalada and for reviving the use of the Timbau, one of the instruments I (try to!) play. As part of this year's carnival in ...
01-Apr-2011
18:17:00
16
The world's most awesome MIDI instrument
This is a Tesla coil that can be played as a musical instrument. According to the information on the supplier's website it can be driven directly by audio or as a MIDI instrument. The tune is being played by the arcs themselves; by switching them at ...
24-Mar-2011
15:20:00
17
As it says, "Beautiful light performance"
Well, we did our first performance with the LED strips on Wednesday at Islington Mill in Manchester,and I'm relieved to say they worked flawlessly, even after one of the wheels was dropped just before the performance started! The lighting in the venue ...
11-Mar-2011
23:01:00
18
Connecting a HL1606 strip to an ATmega
I've been left a comment asking how the HL1606 strips are connected up to an Arduino. The wiring is really pretty simple, but depends on exactly which ATmega version you have, as the hardware SPI pins vary from MCU to MCU. The following assumes it's a ...
09-Mar-2011
23:29:00
19
I'm wheely pleased...
Last night I met up with Andy and Colin of The Travelling Light Circus at MadLab to finally finish off some the LED strips that I've been working on for so long. The original plan was for them to be worn, which would have meant splitting the 4 20-LED ...
03-Mar-2011
08:46:00
20
Openbench Logic Sniffer comes of age
A while back I bought a Openbench Logic Sniffer from Dangerous Prototypes. Whilst it kind-of worked it was most definitely alpha and really not much practical use - no big deal considering the low price. However everything is field-upgradable so I put ...
15-Feb-2011
22:11:00

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