Simple USB to OBD2 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.
Adapter is equipped with 9 pin D type female connector to match most OBD2 cables available commercially. Adapter doesn’t require any special drives as it uses standard Communication Device Class(CDC). Just download CDC driver plug the adapter and this way create a virtual com port. The layout in Gerber format available for download here. The adapter schematic is really simple and easy to trace on single sided board and don’t forget to flash firmware . Too lazy to build one? – author can sell the blank PCB of adapter and preprogrammed chips by request.
[...] [via] Tags: Com, ODB, PIC18F2455, RS232, USB Filed in Interface, Mcu [...]
Are you sure the project you’ve linked to is a simple RS232 to USB converter? Even though there is a DB9 port on there, I think the DB9 interfaces to an OBD connector, not a standard serial port.
When the board is plugged in, it will emulate a serial port through the USB interface by using the CDC driver, but it isn’t a converter. In other words, this board will not add a (useable) serial port to your computer. But it could be adapted to do so.
Still a good find. I’ve created so many USB-UART and OBD interfaces for customers, it’s always nice to see another.
Thank you Dan for pointing this. This post will be corrected.