USB is a very complex protocol, must more complicated than Serial or Parallel, SPI and even I2C. USB uses only two wires but they are not used as ‘receive’ and ‘transmit’ like serial. Rather, data is bidirectional and differential – that is the data sent depends on the difference in voltage between the two data lines D+ and D- If you want to do more USB hacking, you’ll need to read Jan Axelson’s USB Complete books, they’re easy to follow and discuss USB in both depth and breadth.
USB is also very structured. This is good for reverse engineering because it means that at least the format of packets is agreed upon and you won’t have to deal with checksums. The bad news is it imeans you have to have software assistance to decode the complex packet structure but that’s not so bad because every computer now made has a USB host core, that does a lot of the tough work for you, and there are many software libraries to assist.
Today we’re going to be reverse engineering the Xbox Kinect Motor, one part of the Kinect device.
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.