Archive for December, 2011

Fixing Broken PSU of Asus WL-500gP Router

I’ve been using the Asus WL-500g Premium under OpenWRT for years. I always keep a second cold-spare device in stock to minimize our household’s downtime in case the router breaks. Last year, it was actually the router’s power supply unit that ceased to function. After I replaced it with the PSU from the spare device everything was back to normal. The same thing happened again this week, so I decided to document how I fixed the wall-wart back then.

Note: This is potentially dangerous so don’t try this at home! You’ve been warned.

Actually, the hardest part was to open the PSU. Both parts of the case are glued together, so separating them will inevitably scar the case. After the case was open, the worn out capacitor that broke the unit was clearly visible. I just de-soldered the capacitor, replaced it with a new one, and closed the case using two strips of adhesive tape. Done.

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Wifi Enabled RGB Matrix Wall Light, Part 1

Inspired by the so called Lampduino and several other related projects I decided to build my own version of a RGB matrix wall light some time ago. During the last few weeks I finally managed to start out on this project.

Hardware

The matrix of 64 individual cells and the LED back-plane are made from 4mm thin plywood that I spray-painted with a silvery varnish. The outer frame is made from a stronger 14mm birch multiplex board, yielding a very solid construction. I also bought some thin, white PVC board intended as the material for the front cover, but I still have to figure out how to cut that nicely.

Lacking the ambition to create my own LED driver board I settled for the “Rainbowduino”, an Arduino compatible board developed and sold by Seeed Studio. In addition to that, I wanted the matrix to be controlled and programmed over the air. One of the cheapest, easiest, and most versatile ways to accomplish this was to modify an OpenWRT based router for this purpose.

Read the rest of this entry »

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