Hanging wall plotter

I’m posting another project in my “dreaming” category – Bookmarked things that I’d like to have a go at in future. The hanging wall plotter looks amazing and was featured on the Raspberry Pi blog a while back.

The simplicity of this project is obvious – just two stepper motors and a pen-lift servo. It eliminates the hassle of x-y axis mechanisms and sliders, instead using two thin strings or something like fishing line.

Here, the complexity is hidden within the software. Plenty of trigonometry and Pythagoras at work.


Lego compatible add-on pieces

Just a quick post today, but something seems to be happening in the Plastic Construction brick and Raspberry Pi world!

Within a space of two days, I received information about these two:

  • Micrometal gear motor to Lego axle Adaptor which allows geared 6v motors to connect to Lego axles and wheels. I can see that this is going to result in a lot more Lego being automated by Raspberry Pi computers.
  • The PiBlox case for the Raspberry Pi is the second surprise. This is, apparently, a Lego compatible Raspberry Pi case. It features slots in all of the right places. including space for a camera mount.

I can see that I’m going to have to get some! It would be interesting to see if a battery pack, motor driver and servo buffer could be fitted into a second PiBlox case allowing for an all-in-one design.

MeArm – Looks interesting…

I’ve just spotted the MeArm Robot Arm while browsing the interwebs. Looks interesting. A few servo motors and a driver board in addition to the various parts. The whole thing is open-source so it could be worth grabbing the files and trying out. I might need some more powerful servos than the cheaper plastic-geared ones that I’ve been buying.

MeArm is on Thingiverse and can be bought at 4tronix

Miniature Servo-controlled plotter

Amazing what you find when trawling the internet…

This little plotter, built from 6 3d-printed parts, looks like an interesting challenge. I built a stepper-motor controlled plotter years ago and even wrote a simple CAD package in BBC-Basic, but this is a great approach. I’m imagining this combined with ServoBlaster and some simple Python programming. The main  website is at: Miniature Servo-controlled plotter