mbed usb breakout

Posted on Feb 5, 2014

One problem this causes is that the lovely USB port that I have been using to communicate with hyperterminal will no longer be available. So I need an alternative. This lead me to the FT232RL chip. I picked this mainly because it is already in Eagle and stocked by Farnell. After ordering in the IC ( £3. 55) an adapter board (SSOP-28) and a type B USB socket I set about wiring it all up. This allows the FT232RL chip to take power

mbed usb breakout
Click here to download the full size of the above Circuit.

from the rest of the circuit and not the USB bus. I wired up the circuit from the above diagram and after a bit of work to find out which pin of the USB connector was which I was ready to test. A photo of my rather dodgy wiring is shown below. I then find when I plug the cicuit into the PC and power it up Windows pops up with the "Found new hardware" box. OK I select install drivers from the internet and a few seconds later I have a USB devive. OK time for the acid test, I load up hyperterminal and select COM 6 (the one I guess is my circuit), press the mbed reset buttonand get. Success! First time too. OK time to see what this chip can do. I slowly start increasing the Baud rate, 19, 200 115, 200 and its still working. 460, 800 still OK finally 921, 600 still working!

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