Milling PCBs in the Classroom, Updated Workflow

I'm continuing to teach high schoolers to design their own circuit layouts and mill the boards so they can solder them together and have their own custom hardware to keep. The microcontroller I use for these is usually an ATTiny 85, 84, Adafruit Metro Mini, or Raspberry Pi Pico, all relatively inexpensive. What follows is an easier workflow than I've outlined in previous posts.

Make Gears With Turtle Art

 

You can code gears with Turtle Art! If you have a fabrication machine such as a 3D printer, laser cutter, or CNC machine you can download the SVG file from a Turtle Art design to fabricate in your material of choice. Here is how I made these gears—5 and 10 inch in diameter—with a Fox Alien CNC machine.

Mycelium Bluetooth Speaker

 

Someone gave me the electronics to a bluetooth speaker so I figured I had to make a mycelium case for it.

Backyard Inspiration

We have a small—18' x 19'—backyard that was shaded by a large maple until a year and a half ago when it had to come down due to a fungal condition. The yard was hard to do much with because of the shade but now with the increased sunlight we've been able to experiment more with gardening and other decorative planting. Last summer I discovered that grass takes way too much watering to maintain so I've been waiting for inspiration to strike to find an alternative. 

Making a Plastic Press

In another post I showed how to use a tortilla press to compress melted HDPE plastic in flat disks to use for making things. I made a bit more elaborate press to get bigger pieces while keeping them flat and as thin as possible, between 1/8 - 1/4 inch. The key ingredient is a bottle jack.

Melt HDPE Plastic For Projects

I wrote about this a couple years back and I have significantly refined this process so I figured I would provide an update. I still find melted and flattened HDPE plastic to be a useful building material for projects as long as the project specs require something simple like a box, backing, or frame. I've developed a pretty simple workflow that anyone can do with limited tools.  

Arduino Controlled 5V Relay for Christmas Tree Lights

Our christmas tree lights plug into the wall behind the tree and are always hard to reach without sprinkling needles on the floor when we want to turn the lights on or off. This year I made an Arduino controlled relay that can turn the lights on and off with a switch that extends out next to the tree. Here is a video of the switch in action:

Hacked an Answering Machine

I found this old answering machine and originally thought it was a good find for just harvesting the 7-segment display. But as it sat around my work table it occurred to me it would be fun to use the display and buttons to insert a Simon game inside the case. I put it off because it seemed daunting but once I started on it yesterday it turned out to only take a day to put together.

Generative Art with TurtleArt

I made a series of drawings with the LogoTurtle a while back and I am revisiting the same idea of "exploded shapes" using Turtle Art. With this simple idea:

Starter Circuits and Blocks Code on Tinkercad

1. Blink one LED
2. Blink 2 LEDs
3. Turn on an LED with a button
4. Use a potentiometer to dim an LED.
5. Control a servo motor