One of the reasons I designed my own Arduino clone is so that people who wanted to design wearable or portable (ie small/lightweight) projects would have a nice and slender alternative. jordi’s original helicopter used an Arduino Diecimilla, but for weight reasons he decided to go with a Boarduino for rev 2, but even that didn’t get away without a lot of hacking….
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.