Sometimes, we only have access to microcontrollers without all of the peripherals that we need. Several cases like in the AVR line of microcontrollers involving USB support. Luckily there is a library called VUSB that allows us to bitbang USB support into our projects.

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My Website: https://sinelab.net

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VUSB Download: https://www.obdev.at/products/vusb/in...
Code and Schematic: https://sinelab.net/code/vusbkeyboar...
USB Datasheet: https://sinelab.net/pdf/usb20specif...
HID Datasheet: https://sinelab.net/pdf/hid_spec.pdf
Usage Tables: https://sinelab.net/pdf/hid_usage_tab...
Report Descriptor Checker: http://eleccelerator.com/usbdescreqpa...