1st Mock-up of an Arduino powered Four-In-A-Row game. This project will teach basic Arduino concepts like button input and output to drive a led array. The learner will be able to choose the level of difficulty, like a pre-built led array. Or, if the learner is accelerated assemble the whole thing from scratch.
I have uploaded some new parts for Mousetrap car building. These parts make assembling the traditional Balsa wood kit a simple, no mess task. Additionally it facilitates re-configuring the car for a complete learning experience.
The clips are designed to attach the plank to the side rails.
The Axle is designed to slide over the common Brass Axle provided in many kits. It is designed to be a snug fit, but if it works its way loose over the years a set screw can be used. The axle has a threaded hub for the CD Wheel Lug.
CD Wheel Bolt ( or Wheel Lug )
The CD Wheel Lug is designed to fit into the Hub by with threading. It has a detent to easly center and capture the CD. This elimantes most of the wobble in a poorly mounted CD. Whats best is the CD only comes off when you want.
Using these parts the instructor can easily re-use kits from one year to another and let students be creative without gluing thier fingers together.
With three prototypes down and hopefully only a couple more needed. On this third prototype I lengthened the hook so that the throw will be along the entire scale. I reduced the size of the faceplate so it would easily fit the case without post processing.
The next version I am going to try recessed tick-marks instead of the raised marks. During printing, being that the tick-marks are so small my printer creates a skew on the last layer that makes the tick-marks look slanted.
After I get a good basic model, determining the appropriate spring mechanism will be a bit of a challenge. I would prefer 3d printed springs but have not yet determined an implementation I like. This case allows for rubber bands or regular springs and that will likely be the first approach.
Early design of a fully 3d printed Spring Scale. The plan is that it will have selectable scales so you can measure multiple magnitudes on a single scale. There will be many changes, but getting an early version really helps to visualize and think creatively about where it will go.
This is a quick video of the Alpha car being run the first time. I was very happy with it’s performance without any testing. It has a tendency to pull to the left, so that will have to be corrected.
You can view the video on my Twitter feed at :
The linkage between the Strandbeest legs are simple yet somehow not simple. It is basically just a cam shaft but due to the complex motion of the legs my mind wants it to be something else.
To demonstrate how the Mousetrap car is assembled I used the Exploded Assembly work bench. This work bench is not part of the add-ons installer included in FreeCAD. You can find the workbench on github. I hope to use a version of this animation in later instruction videos.
I have been working on my own Strandbeest. It is basic but elegent. In the end it will be focused on ease of assembly and tested to work. Here is the first leg held together temporarily with small tacks. it works better than I expected.
After some development and testing I would like to introduce the Printable MCP ( Mousetrap Car Project ). This models the popular long arm version of the venerable old project but is now fully printable. The .STL for this project can be purchased from TeachersPayTeachers.