SparkFun Johnny-Five Inventor's Kit Based on Tessel 2

Excellent product to work with hardware using JavaScript, highly recommended!

I'm a biased reviewer as I helped build this product and use it to teach. We built it because nothing like it existed, no guides or parts or kickstarters were producing anything that was easy to get started and would teach you both electronics and javascript. The Tessel 2 is the easiest way to use a single board computer and JavaScript much easier to learn and teach than c++. The parts are all useful and each one is used in a chapter in the experimenters guide.I've personally bought over 50 of these kits and have used them to teach from ages 16-60 with astounding success.