If you’ve been following my blog, you probably read up on my last attempt at creating a cooler business card. The basic concept was to design a small circuit that when connected to a computer via USB will emulate a mouse and draw out a design. This utilized the ATTiny85 and VUSB platform which makes writing USB peripherals very easy.
The problem with the original design was that I was controlling the mouse in an open loop manner. I was telling the mouse cursor which way to go, but I had no way to read back the cursor’s position. I couldn’t account for minor inaccuracies brought about by things like mouse acceleration settings, and the design ended up getting distorted.
After writing that post, I realized that it’s possible to configure a mouse to be an absolute input device. An absolute input device is something like a graphics tablet where the device selects precisely where the mouse cursor should go.
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