Boring bar tool holder

Proxxon SD300

Last July I bought a small used lathe. It’s a Proxxon SD 300, also known as Hobbymat MD65 or as PRAZI Saupe/Unitech SD-300. It can hold pieces up to 300mm in length and weighs about 45kg. Why a lathe you ask? I wanted to do more mechanical stuff. 3D printers are fine and all that but I wanted something stronger. At least aluminum.

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Raspberry Pi with RGB-Pixels and node.js

This article is also available in Serbo-Croatian language by Vera Djuraskovic. Thanks Vera!

For quite some time I had my Raspi lying around. And some RGB Pixels as well. So it was about time to bring them together. The last couple of days I built a web interface that I can use to control my pixels. That’s more a technical demo, rather than something useful. But I learned quite a bit.

For the server part I decided to use node.js. For the client I wanted to use Angular.js and Bootstrap. To have the UI work on a mobile as well, I had to include Angular-touchevents.

The pixels are connected to the Raspi vi SPI. Although there are node modules for SPI and Adafruit pixels, they were not working out of the box. I had to poke around a bit to make them work. Changes are included in the node-pixel repository.

When put together, it works like this:

  • The browser opens index.html and renders an array of 25 clickable batches.
  • Clicking and dragging on a batch changes its color and lighting.
  • These changes are send to the server over web sockets.
  • The server receives the color changes, updates the pixels over SPI and then sends a broadcast via web sockets to all connected clients

Over all I’m quite pleased with the outcome. It works and the amount of code is rather small. And I learned to write tiny bits of javascript for the client and for the server. More fun than expected. Especially sending data over web sockets is nice and easy.
As seen in the demo, there is a very noticeable lag between updates. For a more pro solution you may want custom build clients and your own custom protocol (or maybe DMX?) to get rid of that.

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The Almost Useless Machine

We all know, we should use more renewable energy. Here is my contribution. Use solar power if you want to cut 20mm wooden rods. And plan ahead because it may take a while.

This little machine uses a so called solar engine to drive the motor. This solar engine is able to collect tiny amounts of energy over time and stores it in large capacitors. When the voltage reaches a certain level, it opens up and uses all the stored energy at once to drive a motor. These engines were used to drive tiny BEAM-bots and were quite popular a while ago. A lot of information can be found at beam-wiki.org on how to build them and how they work.

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Battery Adapter for Canon Powershot SX200

Last year I bought a Canon PowerShot SX200 on ebay. I wanted to play a bit with CHDK, the Canon Hack Development Kit to make some timelapse things. Problem was, the battery would hold only up for 2 hours or so. Even worse, the camera has no power jack to attach a power supply. The solution is to buy a battery dummy that has a jack on its back. That costs like 30 euros!

3D printing to the rescue!

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The 2 Euros Machine

In January Kolle Rebbe, a german agency, asked if I could help them with their project. The idea was to have an interactive ad poster to collect money for Misereor, a german relief organization. The campaign is named “Mit 2€ viel bewegen”, which means something like “getting things moving with 2€”. You would donate a 2 Euro coin and the coin would travel through the poster, a bit like a marble in a marble machine. On the way to the bottom, the coin would trigger all kind of animations to show, what the money would be used for. Very cool idea!

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Audi Fan Messenger

Testing the Audi Fan Messenger

Almost a year ago Martin came to me and asked me, if would like to join him on a cool project. His idea was to put a LED POV into a real race car. Of course I wanted!

Concept

Every race event attracts a lot of fans. Martin’s idea was to integrate the fans into the race. The race cars should carry fan messages around the track and print them into the night.
The technique used for that is called POV (Persistence of vision). It is somehow related to Light Painting. For that you take a long exposure picture and move the LEDs through it. If the LEDs are switched on and off in the right pattern, it prints a readable message on the picture.

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