While books of phone schematics are common place in Shenzhen (and probably throughout China),an interesting website came up in my search results for something completely unrelated. Ever wonder how mobiles phones are designed to pack so much functionality into increasingly smaller packages? Have a look at cellphonediagram.com and you should find a lot of interesting material to learn from.
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.