A quick tip for those using the excellent Guitarix guitar effects program on Linux. I regularly found both cores of my machine up around the 90%-100% when that application was running, causing XRuns in Jack and clicks in outputted audio. I just found a way around it. For some really weird reason, SSHing into my main box from a separate, really underpowered netbook (an EEE701) with the “-X” flag, then running Guitarix from that machine, results in much lower CPU usage. It’s weird because Guitarix is still running on my main machine, it’s just displayed on the remote machine. Presumably something in the display code for Guitarix is a lot heavier than it should be.
In which I investigate whether I can connect an Arduino Ethernet shield to my Veroboarduino. Not as easy as I first thought it would be!
This weblog is now running on its own domain – www.martyndavis.com. You should have been redirected here automatically if you clicked a link which went to the other address (www.marengo-ltd.com/blog/). Apache mod_rewrite settings, being somewhat of a black art, means it’s possible I’ve mucked something up :) If you see any problems with any pages you’re trying to access, just comment here.
In which we burn an arduino boot loader onto the ATMega, and then upload our own programs.
In which we add the crystal, finish wiring and insert the chip.
It was suggested to me that I should publish the actual circuit diagram of this project, together with a parts list. Here it is!
This is part two of a short series on how to build your own arduino-compatible board from scratch. You can find part one here: http://martyndavis.com/?p=105.
Note: this was going to be one post but it’s ballooned into a huge thing so this is one of several which will be posted over the next few days. Stay tuned!
So you’ve got a nice Arduino board for experimentation and you’ve built a circuit on a breadboard which you’d like to make permanent.
It’s expensive (and overkill) to use a new arduino each time you build a new circuit you want to keep. Here’s how you can easily build an arduino-compatible board, from complete scratch, for a few pounds/dollars/euros so you can keep your real arduino for experimenting with…
The whole point about Linux, surely, is that it gives freedom back to the user.
So what’s with Ubuntu? I got used to the buttons suddenly going on the other side of the window bar in 10.04, but this whole Unity thing now has just pushed me a bit too far.
My Epson Perfection 1640SU scanner recently started behaving slightly less than perfectly… I had a pronounced light vertical line appearing down the length of each scanned image.
Here’s how I diagnosed and fixed it…
Continue reading “Fixing Vertical Lines on a Scanner”