As noisymime stated, Speeduino can handle all of your needs on-board, and with the stepper module
that attaches directly to the main board. Your final request of "assembled" can be handled by several members here that have offered, or edc_atl
, which is no longer participating here, but may possibly assist you. Your location may be important. I can not endorse any specific supplier, except the official Speeduino store operated by noisymime
in Australia. As he is buried under many things to do that help us, the various members offer to assist with supplies and services themselves. Of course, your students could also order the boards and parts, and learn to solder them together as a bonus education!