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USB to RS232

I want to convert the USB signal into RS 232 or BT..
Actually the output of the IRIS sensor gives the USB signal..Then by using a tiny microprocessor,
i have to convert the USB into UART.. (i.e.,) or simply we can say USB to UART converter..

So,i need to program for that microprocessor.. So i want to know that as follows

1.Is it a big task without the development kit????
2*.If not How to develop it?????
3. At last What should i look for choosing the suitable microprocessor in this project??

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  • Not a preferable option, but still...

    ready made USB-serial are easily available in market for not more than $15 or so. you may use it.

    But it depends on....what output does the sensor generate? does it really require a host? etc

  • Dhaval, one of us has clearly grabbed the wrong end of the stick.

    As phrased the question suggests that the device normally connects to a PC via a USB connection, and the desire is to translate that USB interface/function back to serial. This would require the IRIS sensor be hosted by a microcontroller, and the protocol/endpoints of the device be understood. The complexity of this would drive the chip choice.

    As an off the shelf $15 USB-to-Serial dongle also connects to a PC, I don't see how that's going to achieve the goal expressed?