I designed, laid out, assembled, and brought up a USB lithium ion battery charger/power delivery board. I also included a hook for solar charging.
Instead of asking the students to purchase a textbook, one of my engineering professors asked us to buy an Arduino and make something with it as our final project. Due to the open-endedness of the project, many students made LEDs blink... I made a hand. I machined the digits myself, placing a wedge on the end of the knuckle that stopped it from hyperextending. I used the tension of 4 bungee cords to keep the fingers perpetually extended. I then tied fishing wire to the rotors of 4 servos to curl the fingers with the motion of the servo. I received an A+.
At NASA Ames, my group developed and tested "proof-of-concept" designs on Earth so that they may be further developed and used in space later. One such project was relative location tracking for satellites. My team calculated the necessary dimensions of the antennas required, injected a signal into them, rotated them, and viewed the changes in the receiver antenna. This allowed us to determine not only the relative distance between 2 RF sources, but also their relative orientations. Once my team left NASA, we took this project to Santa Clara University, where we further developed it into our Senior Design Project.
The resulting publication may be found here: Senior Design Project Report