For my soft-circuit classes, we have been using either a pre-programmed Attiny85 circuit (https://www.instructables.com/id/SnapNsew-An-Educational-Soft-Circuit-Platform/), or the more expensive Arduino-compatible Lilypad USB. I wanted something in between those two extremes that would be:
After finding the Paperduino project, I learned that a bootloader could be placed on the inexpensive Attiny85 chips so that they could be programmed like a regular Arduino. This method was developed and made popular by the Digispark Kickstarter project.
The Tacuino (think Tic-Tac Arduino), is an extension of my SnapNsew project. It now includes the necessary hardware so that they project can be easily re-programmed by a student after the circuit is built.
The Tacuino is self-contained in that it includes:
This is a just enough "umph" for a reasonable beginning project while demonstrating some of the amazing abilities of an embedded circuit!
Note: An Arduino is nearly bullet proof. This circuit is not. From the bootloader developer:
"[At]tiny85 does not offer any hardware bootloading support, and does not protect the bootloader from being accidentally overwritten by a misbehaving app."
If you are developing a circuit, it may be advisable to use an IC socket and have an extra Attiny on hand.
You can build this circuit with a number of various parts, but these are the ones I've used and found to work well:
Other parts you supply:
Tools and Supplies:
For my workshops, I use SparkFun's Beginner's ToolKit which has most of what you need:
A kit for this project is available on Tindie.com. Purchasing the kit will save you the time and expense of ordering from several different vendors and avoid the minimum PCB order premium. You will also be helping me develop and share other projects in my workshops!