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Re: [Paparazzi-devel] Questions about the Tiny 2.11


From: David Conger
Subject: Re: [Paparazzi-devel] Questions about the Tiny 2.11
Date: Wed, 29 Apr 2009 23:43:09 -0700

Hello,

"What I'm not sure about is why is there a seperate USB cable and port, and a FTDI card? "
A) The autopilot is programmed via USB using that USB mini adapter. See the silkscreen on the board there is a USB connector on there. You are correct about one of the reasons/uses for the FTDI board. UARTs communicate via TTY Serial so it's a handy board to use for communicating with many things. On the bench if you don't want to plug in the modems just plug in the FTDI board to the "serial" connector on the board. 

"If the above assumptions are correct then why is there a a set of pins labeled USB just above the Serial pins? "
A) Not entirely correct. When you need to change the configuration you need to re-send it to the autopilot. This is done via USB (see first response). 

With small UAV weight is important. Also not having lots of connectors and wires. If you have a large UAV maybe it doesn't matter. Most people with small UAV (MAV) will do away with the connectors and run wires just long enough to get from A to B. I would cut the rather large servo connectors off and solder the wires so the servo has a 3-pin molex as the only connector. Remember the ESC DOES NOT USE THE POWER PIN (5v). So, when wiring up the ESC only use the signal and ground wires. For the Rx or PPM board the 5-pin cable is pre-wired and should be easy to figure out. 

-David

On Apr 29, 2009, at 6:34 PM, Michael Caughey wrote:

Ok I bought my Tiny 2.11 and I'm putting it together.  First let me thank PPZUAV for providing the service at a grreat price. : - )
 
I see the diagram at
 
 
and another at
 
 
So connecting the following is pretty stright forward:
  • IRV
  • IRH
  • Servos
Then I have my Radio the XBee09P  (900 MHz).  It appears the cable plugs into it and into the Serial pins on the Tiny.  According to the digi web site : http://ftp1.digi.com/support/documentation/90000938_a.pdf, Pin 1 is the VCC and Pin 10 is the GND.  So I think I can figure out how to connect that.
 
What I'm not sure about is why is there a seperate USB cable and port, and a FTDI card? 
 
So I have a card from Sparkfun that converts USB to a Serial signal.  From what I can gather it connects to the same set of pins as the Serial XBee communication unit.  So I gather that the FTDI is used ONY for connecting the PC directly to the UAV platform.  So normally I will not use this.  Is it for prgramming only?  Can I use the XBee to update the UAV, if say I change a flight lan prior to take off? 
 
If the above assumptions are correct then why is there a a set of pins labeled USB just above the Serial pins? 
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