Introduction to Industrial Serial Data Standards: RS-232, RS-422, and RS-485 @maximintegrated
Maxim Integrated have a patient but thorough ‘Fundamentals of Serial Transceiver Devices’ explaining RS-232, RS-422, and RS-485, including hand-shaking flow control, transceiver configurations, features like forceon & forceoff, with a look at industrial application examples throughout:
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.