Cakes & Desserts & Liqueurs
Various projects at Royal HaskoningDHV
Projects
Polar Vertex
Drawing of the week book
How to turn hundreds of whiteboard drawings in a great looking book.
Modern lamp
How to build your own great looking lamp with wood and easy to get materials.
VouwGrond - Paper craft soil layer visualization
Soil types at almost any location in the Netherlands using paper craft!
MySensors based sensors + dashboards
Introduction to MySensors library & battery powered nodes.
Simple DIY wireless button
How to make a BIG wireless button to trigger anything on your computer, laptop or Rasberry Pi.
DIY dressoir using wood
Candle powered Christmas pyramid
Building a Christmas pyramid (Weihnachtspyramide) with wood.
Construction of a Gloggomobil
Homebuild windmills
DIY Tetrapod plush
Climagon climate paper craft
Internet hardware furniture
Old code
Various games / projects at Deltares
Pompeii - Bike pump controlled game
Om de put (Around the pit)
Levee Patroller
Groen Eiland
Zand verdeler
Horsegame
CPT - game
Port of the Future (Corealis)
Serious game about ports of the future; nature based solutions.
Virtual Reality versions of experimental facilities
CIrcle
CIrcle a tool to support the analysis of domino effects of critical infrastructures.
Sustainable Delta Game
Game which combines 3d graphics, playing cards and a simulation model.
Older games
Augmented Reality / Graphics
Subsoil on a mobile device
My Master thesis: Visualizing and estimating the distance and depth of underground infrastructure.
Real-time visualization of water simulation
Turning calculated water flows into a real-time visualization.
RED - Motion captured animation
Open Data Sources for 3D Data Visualisation
Magic lantern project
Liesegang's 'Janax' Magic lantern
While strolling on the weekly antique market in the city of Delft, this nice looking magic lantern projector showed up.
I have always wanted a magic lantern, so this was a great opportunity. The projector is a "Liesegang Janax" epidiascope, from around the 1918's. This means that it can do both projection of slides (like a slide projector) and other objects (like a overhead projector).
Next to buying the projector, I also bought one box of glass slides from some kind of expedition in Norway.
The lantern was already of the "electric" type: a 500 Watt lamp would normally provide the light. The ultimate goal is to replace the lamp with a LED lamp and turn it into a digital projector.
Keep reading to find out more about this project!
Optics: The lenses
The lantern consists of 4 different lenses. Two for light accumulation, and two as a projection lens:
And how they are placed inside the lantern:
Unfortunately, there are two problems with the lenses. One lens has a damaged corner, and the other is full of airbubbles. Apperantly airbubbles are not necessarily a bad thing (atleast, not in the early 19's ), but they definetly do show up on the image.
And so the quest for two new lenses started. These lenses are quite old which make it difficult to find a replacement.
One lens bears the name "Liesegang No. 10" (or No. 16) which apperantly is a German system for classifying lenses. I have not been able to find any useful information about this system however (if you do so, let me know!)
So, it has to be done through a more difficult approach. The first task is determining the focal length. I have done this semi-accurately using two laserpointers taken from broken memory sticks.
[picture]. Two parallel laserpointers (placed way beyond the expected focal length) should merge together at a certain distance behind the lens. This distance should be the focal length, if I am correct.
This lead to the following information.
Lens | Diameter | Focal length | Thickness | Type |
---|---|---|---|---|
Lens 1 | 42mm | 270mm | 1mm | |
Lens 2 | 50mm | 55mm | 2mm | |
Lens 3 | 115mm | 85mm | 41mm | Aspheric |
Lens 4 | 114mm | 260mm | 19mm | PCX |
Currently I am trying to find out if it is possible to find lenses which match most of these characteristics.
Display: The TFT display
In order to turn the projector to a digital projector, it needs a way to present the image to the display. Through an instructable I found some information about using TFT screens for exactly this purpose.
At eBay there are so many TFT displays which have composite connectors, which can directly connect to the RaspberryPi. This is the approach I decided to go for, as an experiment. After a couple of days the TFT came in, and after opening it, removin the backlight, and all kinds of thin layers on the TFT displays itself, it was ready to put inside the projector. At the same place as a normal slide.
Using a simple flashlight a little bit of display was visible.
Putting this together in the front part of the magic lantern, resulted in the following setup:
More light
Realizing the small flashlight was definetly not going to emit enough light, another item was bought on eBay. This time a 50 watt LED light with adapter. Upon arrival I connected it to an old CPU cooler from an Athlon XP 2600 machine and powered it (just for the sake of testing) by a 9.6v battery.
Later the power supply will be merged with the other supplies. For now this is quite practical. I also plan on making it temperature controlled.
Current status
Currently I am trying to find two important parts for my projector, which is a rather difficult task:
- »A better TFT screen with high resolution with a maximum size of 4.3". a 1024x768 resolution would be nice.
- » Replacement for the collimating lenses.
Finding the right TFT display is a difficult task, as searching is a difficult task: searching on quotes (like 4.3") does not work very well in search engines, and a 4.3 or 3.5, even between double quotes will in many search engines also match for a "10.5".
One proper site I found is Panelook which provides an okay search engine. The Truly TFT7201280-4-E panel looks like a great display (4.3", 1280x720!), but there is not much information to be found about it :(.
For the optics I am considering Edmund optics or their more experimental quality lenses from Anchor optics.