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Re: [Paparazzi-devel] lisa/M - RC command issue

From: Chris Wozny
Subject: Re: [Paparazzi-devel] lisa/M - RC command issue
Date: Wed, 21 Mar 2012 09:10:55 -0700


I may be mistaken, but PPM signals which control servos and motors are
supposed to be values in between 1000 ms and 2000 ms. Even if you were
looking at the PPZ unit equivalent (the unit that Paparazzi uses
internally) that would be between -9600 and 9600. If you are looking
at a signal which is between 8000 and 16000 it could be that you are
looking at the Composite PPM signal (all of the channels' signals put
together.) What is the range of values you see in the Telemetry
Messages in the COMMAND tab when you move the sticks around?

- Chris

On Wed, Mar 21, 2012 at 8:50 AM, Eric BAHIER <address@hidden> wrote:
> Hi,
> We are working on a quadrirotor, with a Lisa/M v1.0 and a PPM receiver. It's
> a Multiplex receiver, and I have a homemade PPM encoder.
>  I'm sending data to the servo 6 connector on the Lisa board.
> Everything seems ok from hardware side, because I receive message on PC
> throught Xbee connection, and I see "good" PPM values in "messages" box
> (values between 8000 and 16000, changing accordingly to RC joystick moves).
> But I cannot control the system from the RC.
>  On GCS screen, the "status" box indicate that I'm in kill mode, and that
> there is no RC signal.
>  I can still start motors with the "resurrect" button, but not from RC.
> Battery level is normal.
> IMU is not calibrate yet. I'm inside, so there is no GPS signal for now, but
> it's connect. Well...
>  I think it's a configuration problem, but I don't know if it come from
> Telemetry.xml or Airframe.xml... I'm using the standard
> "telemetry_booz2.xml" file, and on Airframe, I set : - <target name="ap"
> board="lisa_m_1.0"/> - <subsystem name="radio_control" type="ppm"/> -
> <subsystem name="telemetry" type="transparent"/>
> Best regards
>  Xavier
> --
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