Simple USB to RS232 adapter on PIC18F2455
As COM ports are disappearing form computers – especially from laptops, there are more and more USB to RS232(COM) adapters showing up in the Internet. The bigger choice the better to end user – he can look and build the best solution that fits his needs. This particular adapter was developed by Alex Sidorenko and its main purpose was to comply RS232 to USB of car ODB(On-Board Diagnostic) unit.
   Simple USB to RS232 adapter on PIC18F2455
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www.obddiag.net