Holland’s Rijksmuseum has in their collection this “detector lock,” created by a British locksmith named John Wilkes circa 1680. Made of nothing more complicated than brass and steel, it essentially has two-factor identification as you need to both possess the key and know how to operate the damn thing. And it’s got a clever little counter
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.