If you’ve ever had any questions about how to efficiently add CRC (Cyclical Redundancy Check) to your code, this PDF from the author behind the excellent Hacker’s Delight (Henry S. Warren) is a great start. If you’re interested in writing efficient code, the rest of the site is worth a browse as well: http://www.hackersdelight.org/
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.