Use Arduino boards with HID capabilities such as Arduino Micro & Leornado to inject keyboard commands. The Arduino will emulate HID Keyboard and mouse then launch programs such as powershell and execute commands.
The arduino will take over your mouse and/or keyboard hence it is
advisable to run the code once i.e. in setup() function
moves the mouse to random positions
opens wordpad and types random characters
copies specified files to removable storage.
First insert removable storage and change name to match your disk
types pre-selected text
saves tree of C:\ to text file to removable storage
runs a script from removable storage
opens wordpad and writes a string for the number of specified times