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July 16, 2009
Tutorial - USB Touchscreen Mouse
about 12 years ago
I had to make an account to respond to this, because it might save a ton of frustration.
It's true that you can build this circuit out of spec and it might work, but that can be dicey. I built something similar (attiny45 and v-usb) and I found that without the voltage regulation, only 1/3 of the computers I tried it on could recognize it as a usb device.
It is absolutely worth it to slap on a few diodes to bring the voltage down to the 3.3-3.6 range to improve your chances for compatibility.
No public wish lists :(