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Re: [Paparazzi-devel] RC-link status indicator in gcs do not work as exp

From: Christophe De Wagter
Subject: Re: [Paparazzi-devel] RC-link status indicator in gcs do not work as expected
Date: Mon, 17 Sep 2012 17:29:31 +0200

This means your RC does not stop sending ppm when your Tx is off. Paparazzi has no way to know your TX is off.

Either: use a special version of the 6017 as found in mikrokopter website.
Or use a transistor or AND port together with the red led to kill the pulses when red is on.
Or use a ppm encoder: program your failsafe throttle to less than 0% or more than 100% to tell the ppm encoder that failsafe is entered.
Or: minimal solution: set up the failsafe in such a way that it jumps to auto2. If your transmitter us manual but paparazzi reports auto then it means RCLost
Other options exist. E.g. read the RC led with paparazzi digital io and extra code

On Sep 17, 2012 5:06 PM, "Jorn Anke" <address@hidden> wrote:
There is a strange thing happening with regard the rc-link. First time I turn on the RC-tx, the status indicator in the gcs goes from red to green - as expected. After that, I can turn the tx off and on - without anything happening/changing in the gcs. (I can however control the autopilot/servos as normal when the tx is on).
The same behavious can be seen on the autopilot itselt - if I dedicate one of the leds to display the rc-link status.
This worries me, since I guess the autopilots fail-safe behaviour will not kick in, in case of lost rc-link. I am using a Robbe ppm receiver and a Futaba 7C tx.
Is this normal?
Copy of part of the airframe file:
<airframe name="Yapa v2">

  <firmware name="fixedwing">
    <target name="ap"             board="twog_1.0"/>
    <target name="sim"             board="pc"/>
    <target name="jsbsim"         board="pc"/>

    <define name="AGR_CLIMB"/>
    <define name="LOITER_TRIM"/>
    <define name="STRONG_WIND"/>
    <define name="WIND_INFO_RET"/>
    <define name="WIND_INFO"/>
    <define name="ALT_KALMAN"/>

    <subsystem name="radio_control" type="ppm"/>
    <subsystem name="telemetry" type="transparent"/>
    <subsystem name="control"/>
    <subsystem name="gps" type="ublox"/>
    <subsystem name="navigation" type="extra"/>
    <subsystem name="spi_slave_hs"/>
    <subsystem name="spi"/>

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