Physical Keys Not Just For Doors Anymore, Now Available For Windows

Physical Key Locks and Unlocks Windows Computer

If you have ever forgotten your computer password after a long weekend or maybe you can remember it but just can’t seem to type it correctly, [Thomas] has a project for you. It’s a physical key that locks and unlocks your PC.

So how does it work? The heart of the project is an Arduino Leonardo. You may recall that this board is a bit different from the preceding Arduinos as it can enumerate on a host computer as a Human Interface Device (HID), such as a keyboard or mouse. The Arduino sketch continually reads an input pin using an internal pull-up resistor to make it logic high with the key switch connecting the signal to ground. When the Arduino sees the pin change from high to low, it sends out a keyboard command consisting of the Windows Key and “L”, which is the keyboard shortcut for locking the computer.

When the physical key is turned again, the Arduino sees the pin change back to a high state and it again emulates a keyboard but this time enters your password. You do have to include your password in the Arduino sketch for this to work. In addition, there are two LED’s wired up to show if the computer is locked or not, but you’ll be able to tell pretty quick when trying to get back to work.

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Unlocking your Computer with a Leonardo and an NFC Shield

Manually typing your login password every time you need to login on your computer can get annoying, especially if it is long and complex. To tackle this problem [Lewis] assembled an NFC computer unlocker by using an Arduino Leonardo together with an NFC shield. As the latter doesn’t come with its headers soldered, a little bit of handy work was required.

A custom enclosure was printed in order to house the two boards together and discretely mount them under a desk for easy use. Luckily enough very few code was needed as [Lewis] used the Adafruit NFC library. The main program basically scans for nearby NFC cards, compares their (big-endianned) UIDs against a memory stored-one and enters a stored password upon match. We think it is a nice first project for the new generation of hobbyists out there. This is along the same lines as the project we saw in September.

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