DIY USB password generator

  
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Having done half a dozen V-USB tutorials I decided it`s time to whip up something cool. As USB keyboards were an area untouched, I decided to make a small USB HID keyboard device that types a password stored in EEPROM every time it`s attached. A new password can be generated just by tabbing CAPS LOCK a few times (4 times to start password regenera

tion and one tab for each password character generated, 10 is the default password length). Below you can see the device in action: The place I work at requires me to change my password every few months so this would be one way to skip remembering a new password altogether (as long as I remember to write it down before regenerating a new one so password can be changed :). The device is powered with a simplified version of the hardware I used in my ATtiny85 USB tutorial I stripped away the LCD, reset pullup and both capacitors. If you`re better in cramming components inside enclosures I suggest adding at least a 0. 1 uF capacitor between VCC and GND, but it seems to work fine even without it: The enclosure was graciously donated by an old 512 MB flash drive. I couldn`t make myself to break the USB connector from the circuit board inside, so I stripped appart a short USB cable instead (shown on left): I soldered the connector first, then the zener diodes, then resistors and jumpers, and finally VCC, GND and the ATtiny itself. I used the following tricks to make all ends meet: I was pretty satisfied the result and the fact that it actually worked! The board did not initially fit into the very snug space in the plastic enclosure, so I had to use a Dremel to trim its insides a bit, but after that, everything snapped right back (click for larger versions): Update: For those who are building this project I recommend you first...



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