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Re: [Paparazzi-devel] LPX530AL Gyro board - would it work?

From: Rokas Adiklis
Subject: Re: [Paparazzi-devel] LPX530AL Gyro board - would it work?
Date: Wed, 21 Apr 2010 21:42:47 +0300

I saw it, that some airframes (i.e. slayer1.xml) use GYRO_ROLL and GYRO_PITCH, so if I had a three axis gyro, I could use at least two, But OK, just 1 gyro it will be. Now, which one? I'm browsing the threads, and I found this statement (

"Currently only 2 rates sensors are working well and have proven on MAV without any problems the ADXRS610 and the MLX90609EEA-R2"

And the wiki has a reference to use ADXRS613:

I can see, that the difference between ADXRS610 and ADXRS613 is that first one is 300deg/s and the second is 150deg/s. Which one would be better for Paparazzi?

And off-topic: I have some more questions, that I'd like to ask, if I don't find the answers by myself. Would it be better to create a new thread (i.e. "Noob questions") and post them there to keep the list cleaner, or should I post each question of a different topic to a new thread, so it would be easier to find answers in the future for other noobs?

Thanks in advance.

On Wed, Apr 21, 2010 at 5:17 PM, <address@hidden> wrote:
Buzz is correct.  Currently in the fixed wing code only the roll loop has a rate term.  Would not be too much work to code the pitch, it has just not been necessary.

-------- Original Message --------
Subject: Re: [Paparazzi-devel] LPX530AL Gyro board - would it work?
From: David Carlson <address@hidden>
Date: Wed, April 21, 2010 6:24 am
To: address@hidden


And with gyros, you generally get what you pay for.  But I have only ever seen a roll gyro used.  I'm not sure if the pitch gyro is actually used in the code.  Somebody who knows more than I about the paparazzi code will have to answer that.


On 04/21/2010 03:09 PM, Rokas Adiklis wrote:
Thanks David. Can I remove the wires from the receiver board and use the connector on the adapter board?

And what about the gyros?


On Wed, Apr 21, 2010 at 10:28 AM, David Carlson <address@hidden> wrote:

That adapter will allow you to have a backup battery (capacitor) attached to the board.  I have two of them and they work just fine.  This is also the reason that the wires are not very securely fastened.  There is no way to do it without removing that male adapter.  So that just leaves attaching to small resistors and capacitors.  When I return I hope to have some of those boards made.


On 04/20/2010 10:33 PM, Rokas Adiklis wrote:
Good evening everyone,

first of all - huge thanks for all the work you guys have created! It's amazing how professional things can be done in opensource way. I have some questions, maybe you could help me out a bit.

I was looking for a cheap gyro, and came up with this one:

It seems to have analog outputs, and 2.7-3.6V input. I don't have a good knowledge in electronics, so I would very much appreciate your professional oppinion - would it work with TWOG? As far as I understand, I will only be able to use two channels, as I couldn't find anything about third axis (YAW) gyro configuration in airframe file. So maybe two of these would be a better choice?

Also, I saw that the recommended gyro (ADXRS613) has sensitivity of 150deg/s, and the above ones have double of that (300deg/s). How would this influence the performance?

And last, but not least - I'm changing my GPS receiver to "LEA-5H with Active Sarantel helical" (from CheBuzz). It doesn't have internal battery (so it starts up longer), and it came with wires ripped off. The latter is not a big problem, but I've found this adapter, that might solve both issues:

Do I get it right - if I attach this adapter to my GPS receiver, it would enable it to hotstart, and to have a more convenient cable plug?

I have way more questions left unaswered, but I'll stop for now, as I haven't read EVERYTHING yet :) And thanks in advance for your support.

Rokas Adiklis.
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