Re: Serial Levels on OT3m
- The BlueSmirf can take 5V levels (and so can the Tracker 3 at the DE-9 serial port), so you won't risk frying the ICs on either end of that connection, but they won't talk to each other on their own.
The BlueSmirf uses TTL serial where (in this case) a +5V signal is a logic "1", but the Tracker 3, at the DE-9 port, uses RS-232 where 0V is a logic "1". You can see that these two devices won't be able to communicate directly. The Sparkfun product page for the BlueSmirf (https://www.sparkfun.com/products/10269) even addresses this and has a link to their own RS-232 to TTL converter product.
You *might* be able to get around having to use a converter circuit by finding a spot on the PCB of the Tracker 3 board where you can solder in a wire to access the serial lines at the TTL level, but I don't yet own a Tracker 3, so I'm not sure about that.
If you don't mind buying directly from China and having no product support, you could get an integrated RS-232 to Bluetooth adapter like this: www.dealextreme.com/p/db9-rs232-wireless-bluetooth-serial-module-104301
Anyway, the BlueSmirf modules are great (I've used them in a few projects myself), and they'll work fine to add Bluetooth to a Tracker 3, you'll just need to account for the different serial protocols with an additional circuit or perhaps some clever soldering. Good luck!
- Cai /W6CAI
--- In firstname.lastname@example.org, "Andrew Wawrzynowicz" <mechcondrid@...> wrote:
> Ya its a sparkfun bluesmirf silver i thought it could take up to 5v signal