I have been working on a project to build an opensource robot for that will get children interested in programming and robotics for $20. As luck would have it you came out with the Trinket at the same time we started brainstorming on this. So this bot is braced on that micro controller, but also uses a breadboard so people can upgrade if they want more than 5 pins.
We haven’t quite made it down to $20 yet, but I have put together a bot that totals out to be $35(ish) to get things started. It still needs a few tweaks to the wheels, but I’ve already built one out of wood and will be making another out of acrylic.
Anyway, I am a huge fan of what you guys are doing and eager to get others involved. So here is a link to the latest template including a parts list. thingiverse.com/thing:166465
Trinket may be small, but do not be fooled by its size! It’s a tiny microcontroller board, built around the Atmel ATtiny85, a little chip with a lot of power. We wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation. Perfect for when you don’t want to give up your expensive dev-board and you aren’t willing to take apart the project you worked so hard to design. It’s our lowest-cost arduino-IDE programmable board!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.