Re: [tracker2] OT2 and GTRANS together
> The resistor was added because the processor on the GTRANS runs at 3.3 voltsI think the GTRANS processor wants inputs no more than .2v over Vdd.
> and the output from the OT2 is at 5V. I have not checked yet whether the
> GTRANS processor has 5V tolerant inputs.
The processor will run at 5v, though, and the MAX3232 should as well. I
ran it at 3.3v because the signals to and from the nuvi are 3.3v.
But rather than mess with that, I'd just try running the data out from
the nuvi to both the GTRANS and OT2m in parallel.
- Hmm, I saw the pictures in the attachments but now they are not there. If they don't return by Monday, I will repost.
--- In email@example.com, "Fred Hillhouse" <fmhillhouse@...> wrote:
> Finished the install based on the last email or two.
> The pictures show the connections.
> Red: +5v
> Black: Ground
> Yellow: Data in
> This last go around proved to be simple.
> Basically the steps are:
> 1. Remove heat shrink. No more than what covers the USB solder points is
> necessary to remove.
> 2. Solder suitable wires into the holes. Only 3 holes!
> 3. Connect the other end to the OT2 PCB.
> 4. Route the NMEA cable out the power cable hole and you are done.
> 5. Select port B for Garmin.
> That wraps up the GPS side of the GTRANS.
> I picked the Kenwood cable because I have an ample supply of DE-9s. I can
> always use another right angle 2.5MM plug. I left that connector on for now.
> For one, I have a D7 to try it with. I have no doubt it will function. A
> future change will be to move the NMEA output to pin 1 of the serial
> connector and build a three headed cable: PC, GPS, NMEA.
> In the photos, you will see a ribbon cable and connector. This is for the
> LCD display. I wrapped the ribbon around the Kenwood cable and exited out
> the back. I guess I should add a photo for the LCD interface.
> Best regards,