This project purpose is locking Caps USB HID keyboard. After it plugged to USB port it will waits between 30 seconds and 8 minutes before start to toggle the Caps Lock status on or off. The Caps Locker was built on an Atmel AVR ATTiny45 based on the Easy Logger application from ObDevIt with little modification. The designer say that this project was intended for demonstration and experimentation purposes only and should never be used in situations that would result in loss of data.
Source code and Schematic
Keyboard Caps Locker
Read Avr Usb Caps Locker Documentation