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Re: [Paparazzi-devel] Questions about mounting paparazzi hardware

From: cory barton
Subject: Re: [Paparazzi-devel] Questions about mounting paparazzi hardware
Date: Wed, 30 Jul 2008 16:51:13 -0400

What about the gyro, does its rotation about the x axis matter?

On Wed, Jul 30, 2008 at 12:02 PM, Volker <address@hidden> wrote:

Oops, seems i forgot a whole sentence...
look for
<define name="ROLL_DIRECTION" value="-1."/>
I had to change the sign to "+" means value="1." in order to use my gyro correctly.


-------- Original-Nachricht --------
Datum: Wed, 30 Jul 2008 10:32:16 -0400

Von: "cory barton" <address@hidden>
An: address@hidden
Betreff: Re: [Paparazzi-devel] Questions about mounting paparazzi hardware

Volker replied directly to me, so I have pasted the text of his email below.

So if I understand correctly, the PCB of the gyro needs to mounted in the YZ plane of the airframe perpendicular to the X axis. Am I correct that rotation about the X axis is not important?

You lost me with this: "Just take the setting in the gyro section of the funjet1.xml airframe file, my sign hat to be >changed respectively."

What does "my sign hat to be >changed respectively" mean?
I looked in the gyro section, and as I understand it, I will have to take the values from the gyro when the airframe is level and unmoving and set them for roll neutral and temp neutral?

With respect to the modem, I think I will have to experiment with different mounting options. In the front of the plane, I have the motor and esc, then toward the middle, the reciever, then the antenna for the receiver runs to the rear, so I don't have a lot of area without some sort of electrical activity.

Also, the funjet is not mine, I found the pics in the wiki's images. I looked through most of the pics looking for pics of how things are mounted. I have a Nexstar EP.



>Hi there Cory
>Excellent idea with your wiki additions. The Funjet is a good airframe for pprz. Got one myself.
>Sorry for being brief, i ve got only a few minutes and i m not at home at my workbench.
>Just this for the gyro mounting: the pcb of ADXR150/300 gyros has to be vertical. Look for some circle with a cross within on the pcb. >The cross is the back end of an arrow (while a dot is the tip of an arrow) and this has to be aligned with the airframe´s longitudinal >axis (roll axis). Have a look a this pic, the gyro is mounted at the >wooden plate just below the xy-ir-sensor. The other thing is a mini-USB connector btw. You can mount it in this orientation too, of >course, which would be mirrored to mine. Just take the setting in the gyro section of the funjet1.xml airframe file, my sign hat to be >changed respectively.
>Will send you some pics of my autopilot mounting later.
>My Aerocomm transceiver is very close to the ESC which causes trouble. Will change it in the next couple of days. Antennas and >range will be an issue too.

On Wed, Jul 30, 2008 at 6:18 AM, Bernard Davison <address@hidden> wrote:
Excellent Idea for a page. I've noticed this sort of information is missing from the site too but I'm waiting for my next pay to purchase the paparazzi hardware...

One thing I noticed in the pics showing the orientation of the IR sensors in the second picture is upside down compared to the first.
i.e. in the first the cable connection goes down where as in the second it goes up.
Does this matter?
From what I've read I don't think it matters but it might be good for people like me who aren't quite sure...


On 30/07/2008, at 6:27 AM, cory barton wrote:

I have almost everything I need to install the paparazzi autopilot in my aircraft except the little molex pins, so I am planning how I will mount all of the different bits on the aircraft(high wing trainer).

I started by searching the wiki, and the mailing lists, and I found some of the information I needed.

I took the information I found, and created a new page on the wiki:  <--- Please take a look and add or edit
I didn't make any links to the page yet, pending some further review.

The parts that are still unclear to me are:

1. Is there a particular way that I should mount the gyro? Does orientation matter?

2. Modem
    a. How far away from the receiver and antenna is considered safe?
    b. Can the xbee module be within a couple of inches away from the motor and speed controller?

3. Is there any special issue with mounting the autopilot, other than making sure the GPS has good signal?



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