How does a USB keyboard work?
The USB 2.0 spec: https://eater.net/downloads/usb_20.pdf
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How does a USB keyboard work?
The USB 2.0 spec: https://eater.net/downloads/usb_20.pdf

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V-USB on an ATmega328! - V-USB and HID Explained
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 V-USB that allows us to bit-bang USB support into our projects.
-- Links --
My Website: https://sinelab.net
Buy me a coffee: https://www.buymeacoffee.com/thesinelab
V-USB Download: https://www.obdev.at/products/vusb/in... \
Code and Schematic: https://sinelab.net/code/vusb-keyboar...
USB Datasheet: https://sinelab.net/pdf/usb-20-specif...
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... --
Add USB To Your Electronics Projects! - The USB Protocol Explained
USB is both the simplest and most complex interface to use. It is simple to plug in and let the computer handle. It is complex to create and run a microcontroller with it.
-- Links --
My Website: https://sinelab.net Buy me a coffee: https://www.buymeacoffee.com/thesinelab
Schematic: https://sinelab.net/pdf/usb_test.pdf Code: https://sinelab.net/code/usbify.zip
ASF-USB: https://asf.microchip.com/docs/latest... LUFA: http://www.fourwalledcubicle.com/LUFA...
USB Datasheet: https://sinelab.net/pdf/usb-20-specif...
ATmega16u2 Datasheet: https://sinelab.net/pdf/ATmega16u2.pdf
Adapter: https://www.aliexpress.us/item/225183... --