Using a RGB sensor to change the color of Fireworks in Virtual Reality.
A cat feeder that feeds your cat at set intervals and texts you when it does
Uses IR signal to latch/unlatch a relay
Use a Tessel and connect the same with Salesforce consuming the Salesforce REST APIs to create an employee check-in system.
Use Tessel with Google Compute Engine GPU instance running Darknet YOLO via a Node.js server to perform multibox detection over websockets!