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Author Topic: USB device to serial  (Read 286 times)
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I bought an elm327 obd reader to interface my car with my arduino. I got a USB one, the only alternative I could find was Bluetooth. It seemed to have the same pinouts as the one on this site. But after trying it I find it does not work. Then I noticed mine has a chip not on the one on that site, a FT232RL USB bridge. So that must be a problem. I was hoping it was possible to use the FT232RL datasheet to locate what traces on my device are the serial lines so I can still use it. I assume they would be pins TXD and RXD but I've got no clue really.

I would appreciate any kind of help... Thanks


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I don't know about the FT232L, but I do know about the PIC chip.

The TX and RX serial lines are pins 17 and 18:



If it is using serial, which it probably is, these are the pins to trace.

Data sheet for the PIC chip is here: http://ww1.microchip.com/downloads/en/DeviceDoc/39637d.pdf


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Pins 1 & 5 on the FT232 is TX/RX. If you want to talk to the PIC with the arduino you will have to desolder the FT232 chip otherwise it won't work. If you are lucky there is two resistors you can remove that breaks the connection between the two chips.

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