This old USGI flashlight gets a new lease on life by using its batteries to charge up my phone. I modified the tail cap to fit an Adafruit MintyBoost circuit in. It still functions as a flashlight, too. It might be useful for camping trips and emergencies, but mostly I did it because it’s cool.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.