I made a modern version of a harmonogram. That is generating patterns through moving pendulums. There is an Arduino collecting the data and shipping it out to a Raspberry Pi to do the drawing.
Excellent!
Your projects always are stunning and complete.
Still, do I have to buy the book to know what sensors you used to get the pendulum position? Just out of curiosity. (And the techie in me about sampling frequency - analogRead being what it is in the Arduino)
I do not quite see why the pi came into the picture ... oh wait, it is a complete Linux pc, so it drives the screen. Oh, yes, when pausing the film I can see the wiring.
Great project!
Why can't I enter the site?. (Something concerning security?)
Thanks for the comments.
Why can't I enter the site?. (Something concerning security?)
When I worked for a certain company a few years ago Vimeo was blocked where as You Tube was not. When I complained to the IT department about it they said they had a web filtering black list from a third party. So I looked on the site that provided the black list (can't remember who it was now ) and they said the site was blocked because of gratuitous violence. I have never seen any violent content, it tends to be more art type people than anything else. Anyway my IT department did put it on a "White list" so it was not blocked any more. Maybe you have some sort of web filtering at some level in your path to the site?
do I have to buy the book to know what sensors you used to get the pendulum position?
No it was a AS5040 Hall effect rotary sensor. It has an SPI interface and the four sensors were chained so it looked like one long shift register. Sample rate could have been much faster but I only needed about 10 per second per pendulum.
I do not quite see why the pi came into the picture
The book was about Raspberry Pi projects but I had to squeeze an Arduino into it didn't I. 
The Pi had to buffer at least 4K of data to to cope with the time that Linux steals.
All things being well I hope to show this at the Rome Maker Fair this year, if it is accepted, and I can cut down the frame to get it into an airport approved suitcase.
Here is a photo of the head end.
Maybe you have some sort of web filtering at some level in your path to the site?
Thanks, Grumpy.
I'm not sure about the walls I have (I'm not working in a corporate net). I'll try on another connection I have access to.
Regards