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Hardware projects

Beagleboard VGA output

This article describes how you can extract a VGA signal from the LCD headers on a revision C beagleboard using two transistors and a bunch of resistors. Read more.

Posted Sunday 17-Jan-2010 17:00, 15 comments.

Beagleboard stable USB EHCI hack

Occasionally, the USB EHCI controller on a Rev C3 Beagleboard stops working until the system is rebooted. It is usually triggered by heavy traffic, e.g. due to a WLAN dongle or a USB thumbdrive. It was apparently fixed properly in Rev C4, but if you're stuck with a C3 board the following hack may solve the problem for you. Read more.

Posted Thursday 13-May-2010 15:35, 0 comments.

Craft

Craft is a demo running on its own minimalistic demo platform. The demo platform is based on an ATmega88 microcontroller. Read more.

  • lft_craft (Original video clip, Xvid, 89.4 MB)
  • lft_craft_src (Schematics, firmware binaries and source code, 70.5 KB)

Posted Thursday 27-Mar-2008 20:33, 124 comments.

Making the Chipophone

It all started when a good friend of mine asked me if I wanted an old electronic organ. He had bought it in a thrift store some years ago, but had now realized that it would remain untouched in his cellar forever unless he could find a new home for it. I accepted the gift on the condition that I could do whatever I wanted with it, in terms of modifications and experiments. Read more.

Posted Wednesday 21-Jul-2010 21:42, 101 comments.

Phasor

Phasor, like Craft, is a demo running on a custom minimalistic ATmega88-based demo platform. But it generates a composite video signal (PAL) instead of a VGA signal. Read more.

Posted Wednesday 7-Apr-2010 13:58, 28 comments.

Power Ninja Action Challenge

Here's another ATmega88-based hardware chiptune, this time composed for Little Computer People 2009. It was my contribution to the "other music" compo, and won the 1st place. Read more.

Posted Sunday 19-Jul-2009 17:47, 11 comments.

Spellbound

Spellbound, composed by Rob Hubbard in 1986, performed on the Chipophone. Read more.

Posted Wednesday 21-Jul-2010 21:42, 16 comments.

The Chipophone

The Chipophone is a homemade 8-bit synthesizer, especially suited for live chiptune playing. It has been built inside an old electronic organ. Read more.

Posted Wednesday 21-Jul-2010 21:42, 112 comments.

The Swan

In an attempt to squeeze as much emotion as possible into a tiny chip, I managed to fit Camille Saint-Saëns' The Swan into 480 (out of 1024) bytes of ROM on an ATtiny15. The microcontroller runs at 1.6 MHz and provides 32 bytes of RAM (actually registers). Read more.

Posted Monday 26-Apr-2010 16:12, 6 comments.

The chimney claw project

One year, my parents realized that there was a bird's nest down their chimney, at the very bottom. You could hear the chirps from within the kitchen. Read more.

Posted Wednesday 20-Jun-2007 17:31, 3 comments.

The hardware chiptune project

Normally, when you create a chiptune, you start with an existing chip (such as the SID chip or the YM2149) and write a tune for it. We decided to start from scratch, and create a chip and a tune. Read more.

Posted Saturday 30-Jun-2007 11:04, 51 comments.

The lampslide

If mounted normally, this chandelier would hang between the projector and the screen, casting a shadow. It would also block the view from the sofa. By using a wooden door jamb as a rail and constructing a small car to slide along it, I've suspended the chandelier so that it can be moved out of the way easily. Read more.

Posted Tuesday 10-Nov-2009 16:31, 3 comments.

The pot plant monitor

This pot plant is connected to my computer. Every five minutes or so, the resistance of the soil is measured. The resistance varies indirectly with the dampness of the soil, as you can see in the graph. Read more.

Posted Wednesday 9-Jan-2008 17:20, 11 comments.

The remote control project

This is the story of how I built a remote control system for my computer and speakers. It is based on an off-the-shelf universal remote and some AVR chips and other electronics. Read more.

Posted Friday 26-Oct-2007 16:39, 9 comments.

Turbulence

Turbulence is the successor of craft. It's a microcontroller demo based on the Propeller chip from Parallax. External I/O consists of stereo sound (at line level) and a VGA signal. Read more.

Posted Monday 13-Apr-2009 13:09, 17 comments.