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Re: [Paparazzi-devel] Motor Problems solved! What about Gyros?


From: Nathan Sandoval
Subject: Re: [Paparazzi-devel] Motor Problems solved! What about Gyros?
Date: Tue, 17 May 2011 22:32:47 -0600

Thank you Steven Dwyer for your motor connection tips. I know it was months ago that you responded. I was working on a Senior Capstone project for the University of Arizona, and with all the due dates and deliverables it was very difficult to keep up with my e-mail correspondence. However, your advice saved our project! We were successful in implementing an autopilot using paparazzi for the MAV lab at the U of A, and we got an A! The MAV lab was very interested in our work with Paparazzi autopilots.

I am now developing with paparazzi for a more specific situation this Summer:
I want to use Paparazzi as stabilization for a manual indoor flight and eventually I want to try to use IMU to autopilot indoors (I dream big). I was wondering if it is possible to use 2 gyros in the two ADC ports of the twog (to get 3 axis gyro info) to act as stabilization WITHOUT IR sensors.

Currently I have my gyros are connected and configured and I can tell that I am receiving data, however, they do not help correct in AUTO1 at all (even though I added corrective code similar to what is in the IR section). Does anyone have any helpful insight for this effort?

thank you!

Nathan Sandoval



> Date: Sun, 3 Apr 2011 12:00:01 -0400
> From: address@hidden
> Subject: Paparazzi-devel Digest, Vol 85, Issue 5
> To: address@hidden
>
> Send Paparazzi-devel mailing list submissions to
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>
> Today's Topics:
>
> 1. Adding NMEA to the gps type (Todd Sandercock)
> 2. Motor problems (Nathan Sandoval)
> 3. Re: Motor problems (Stephen Dwyer)
> 4. MLX 90247 parts out of stock anywhere! (Ali H.M. Hoseini)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 2 Apr 2011 17:52:01 -0700 (PDT)
> From: Todd Sandercock <address@hidden>
> Subject: [Paparazzi-devel] Adding NMEA to the gps type
> To: Paparazzi Development <address@hidden>
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="utf-8"
>
> Hi all
>
> Is there any way to add NMEA to the GPS type in the airframe file?? there seems
> to be enough completed in the NMEA parser to be useful. I want to test the NMEA
> code with some ground software so it doesn't need to be flight critical yet.
>
> Todd
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>
> ------------------------------
>
> Message: 2
> Date: Sat, 2 Apr 2011 20:59:30 -0600
> From: Nathan Sandoval <address@hidden>
> Subject: [Paparazzi-devel] Motor problems
> To: <address@hidden>
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> Hi all,
>
> I am currently working on a University paparazzi project
> at the University of Arizona and I am trying to just get a basic plane
> in the air. I have all the components I need and I have tested most of
> my components and they are working. However, I have a problem with my
> motor. Anytime I connect my speed controller to the TWOG and then power
> the TWOG and Speed controller (and of course the other end of the speed
> controller is connected to the motor), the TWOG begins to heat up
> rapidly. One of my TWOGs actually burned up from being powered on for
> about 30 seconds while connected to the speed controller. I currently
> powering both the speed controller and the TWOG from the same battery.
> My speed controller is a 40-Amp Lite Pro SB Brushless ESC. (I am not
> terribly experienced, but I wonder if my motor is just too big/ drawing
> too much power?)
>
> My idea to solve the problem is to power the speed controller and the twog separately, and maybe just have the transmit pin connected between the TWOG and speed controller to ensure that it doesn't try to draw power from the twog.
>
> Would this work? (I ask because I don't want to blow up another TWOG!) Any other ideas for how to solve this overheating problem?
>
>
> thanks!
>
> Nathan
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> ------------------------------
>
> Message: 3
> Date: Sat, 2 Apr 2011 21:45:12 -0600
> From: Stephen Dwyer <address@hidden>
> Subject: Re: [Paparazzi-devel] Motor problems
> To: address@hidden
> Message-ID:
> <address@hidden>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hello Nathan,
>
> Just to clarify, how do you have the servo cable on the ESC wired to the TWOG?
>
> It sounds like you have the +/- of the battery wired to the
> appropriate +/- battery terminal on the ESC as well as the +/- power
> input terminals on the TWOG. Then, my guess is you have the servo
> cable from the ESC plugged into one of the 3 pin molex servo
> connectors on the TWOG. The red wire coming from the ESC will be
> supplying 5V to the TWOG if it is connected. This is not good. You
> need ONLY the SIGNAL line from the ESC connected to the TWOG (if the
> ground is also connected, you will have a ground loop, which is bad).
> Note also that if you are powering from a different battery, both the
> SIGNAL and the GND lines should be connected between ESC and TWOG, but
> never the 5V line. See the wiring diagram on the TWOG page of the
> wiki:
>
> http://paparazzi.enac.fr/wiki/Twog_v1#Electrical_Connections_to_the_Airborne_Equipment
>
> Note that only "PWM Signal (Thr)" is going from the TWOG to the ESC,
> not GND or 5V.
>
> Hope this helps.
>
> Thanks,
> -Stephen Dwyer
>
> On Sat, Apr 2, 2011 at 8:59 PM, Nathan Sandoval
> <address@hidden> wrote:
> > Hi all,
> >
> > I am currently working on a University paparazzi project at the University
> > of Arizona and I am trying to just get a basic plane in the air. I have all
> > the components I need and I have tested most of my components and they are
> > working. However, I have a problem with my motor. Anytime I connect my speed
> > controller to the TWOG and then power the TWOG and Speed controller (and of
> > course the other end of the speed controller is connected to the motor), the
> > TWOG begins to heat up rapidly. One of my TWOGs actually burned up from
> > being powered on for about 30 seconds while connected to the speed
> > controller. I  currently powering both the speed controller and the TWOG
> > from the same battery. My speed controller is a 40-Amp Lite Pro SB Brushless
> > ESC. (I am not terribly experienced, but I wonder if my motor is just too
> > big/ drawing too much power?)
> >
> > My idea to solve the problem is to power the speed controller and the twog
> > separately, and maybe just have the transmit pin connected between the TWOG
> > and speed controller to ensure that it doesn't try to draw power from the
> > twog.
> >
> > Would this work? (I ask because I don't want to blow up another TWOG!) Any
> > other ideas for how to solve this overheating problem?
> >
> > thanks!
> >
> > Nathan
> > _______________________________________________
> > Paparazzi-devel mailing list
> > address@hidden
> > http://lists.nongnu.org/mailman/listinfo/paparazzi-devel
> >
> >
>
>
>
> ------------------------------
>
> Message: 4
> Date: Sun, 3 Apr 2011 19:11:09 +0430
> From: "Ali H.M. Hoseini" <address@hidden>
> Subject: [Paparazzi-devel] MLX 90247 parts out of stock anywhere!
> To: address@hidden
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,
>
> I built a paparazzi autopilot pcb, and its sensor boards, but now I could
> not find MLX90247 sensor anywhere to buy. All component distributors are out
> of stock.
>
> Any suggestion please?
>
> Best regards.
> A. Hoseini.
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> End of Paparazzi-devel Digest, Vol 85, Issue 5
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