The AT-550 was an incredible watch for its time, or even for today. It had a capacitive touch screen, and that was used to operate the built-in calculator. How it did so trumps even the fact that a watch released in 1984 had a touch screen, much less at a price of under $100. To enter numbers and the numerical operators, one just “wrote” them with a finger, by tracing the appropriate shape on the watches crystal.
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.