Sorry for spamming, but just saw this one as well:
The FTDI link for the other one I mentioned is:
Which one should I get, if I should get either one at all?
They can both be powered either from the USB bus or the TTL device and
can handle TTL levels ranging from 1.8 - 5V. The MM232R one is said to
be TTL/CMOS but the UM232R is only TTL - and I have no idea what that
On 2/14/07, Arnar Birgisson <arnarbi@...> wrote:
> Hi again,
> A local supplier says he can order from FarnellInOne, and they have
> this FTDI board in stock:
> It looks promising to me, but then again I'm a complete noobi in
> electronics (I'm a math major :o). So, should I ask my supplier to
> order this for me?
> On 2/13/07, Chad Robinson <crj@...> wrote:
> > Arnar Birgisson wrote:
> > > Hi all,
> > >
> > > TTL-RS232 converters seem to be very hard to get up here in Iceland,
> > > so I was going to try building my own (the four component version).
> > > This seems easy enough, except...
> > >
> > > I don't have a RS232 port on my laptop - so I would need a RS232 to
> > > USB anyways. Do you guys have any schematics for a TTL level serial to
> > > USB? I have some PICs lying around if those are needed. I don't know
> > > USB at all so maybe I'm asking for something impossble.
> > >
> > Go to FTDI.com and look at their FTDI232. They even have sample
> > schematics. It's a chip that does exactly what you're looking for.
> > They're quite a nice device because neither Windows or Linux requires a
> > special driver for this chip - they both have standard drivers that show
> > the device as a fake serial port. I use them all the time to add USB to
> > microcontroller projects - you just hook it up to the microcontroller's
> > serial port, and you're USB-enabled in short order. With some software
> > hacking the device can go to 1MBps if you need some real speed.
> > In fact, it's actually a little more convenient than a real serial port
> > because you don't need any level translation. There are 5V and 3.3V
> > (IIRC) versions of the device, so you get the level you want right away,
> > with no translation.
> > Regards,
> > Chad
> > -------------------------------------------------------------------------
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