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Permalink Reply by Ken on February 5, 2011 at 7:05pm

Are you talking about the GPS connector to GPS connector cable (6 wires), or the GPS to FDTI cable "adapter cable" (4 wires)?

 

On the GPS/GPS, no the red is "pin 1" it is not Vcc.

* pins 1 & 6 are not needed.

* pin 2 is Vcc (5V)

* pin 3 & 4 are Rx/Tx (forget which is which)

* pin 5 is ground

 

On the GPS/FTDI cable *warning* there seem to be 2 variants in the wild:

 

On mine, yes the red wire is Vcc. On the GPS end, if you hold it so that the plug is away from you, so as to push it "forward" into the GPS, the red wire is on the right (pin 2, pin 1 has no wire). See above for which is which.

 

On the FTDI end, red is pin 3, 3rd away from the ground pin.

pin 1 - black wire, ground

pin 2 NC

pin 3 - red wire Vcc (5V)

pin 4 & 5 Tx/Rx (or Rx/Tx)

pin 6 NC

 

BUT: Someone posted a day or two ago that they had this cable with the red wire going to pin 1 on the FTDI end which should be ground. Uh oh! I'll see if I can find that post and provide a link.

 

Edit: here it is: http://www.diydrones.com/forum/topics/mtk-gps-to-ftdi-cable

Yes, Vcc should be 5V going in on these connectors. The EM-406A runs on 5V nominal. The MediaTek (3.3v nominal, 5v *max*) has a regulator on the adapter board.

 

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Permalink Reply by nilbo on February 5, 2011 at 8:03pm

Hey Ken, thanks for the information! I believe it's the 6 wire gps/gps connector that came with the board:

http://store.diydrones.com/EM_406_uBlox_Adaptor_Cable_15_cm_p/ca-00...

I am hooking this up to an Arduino and it would be easier to simply cut off one side of the cable and solder it to a pin header to use with a breadboard (instead of soldering directly to the adapter board) while I work out the software. Once everything works I'll go ahead and probably solder directly to the board.

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