via the ananialog
TheÂ XOrduinoÂ is a stripped down low-costÂ Arduino-compatible board that plugs right into the XO’s USB ports. But wait, there’s more: it’s also compatible with theÂ Scratch Sensor Board, so you can use this device to controlÂ ScratchÂ (andÂ Turtle Art?). It should be compatible with theÂ Arduino IDEÂ and allÂ Arduino Leonardo-compatible shields.
There are only 20 components needed for basic Arduino functionality, costing $5 from digikey (in quantities of 100 or more). Local labor or even older kids could assemble this by hand.
TheÂ XO StickÂ is for when $5 per student is too much money. Â Based on theÂ AVR StickÂ and theÂ ATtiny85Â processor, it costs only $1/student. It’s not as user-friendly as the Arduino-compatible board, but can be used to teach simple lessons in embedded electronics.
EagleÂ design files on github: