General discussions about V-USB, our firmware-only implementation of a low speed USB device on Atmel's AVR microcontrollers
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D- -> PD4 (I have added a 3V6 zener)
shouldn't D- be connected to pin 0?
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We have removed this requirement in one of the latest releases. You can now use any bits of the port for D+ and D-.
If you happen to use an old verison of AVR-USB, you will get a compiler error when D- is bit 4.