This is strange.
Installed current Arducopter firmware on APM 2.5
Unlike my plane, when RX (PPM) loses signal, or is disconnected from APM - then the APM just freezes last RC input values, and so, fails to detect connection loss.
You need to be a member of diydrones to add comments!
Replies
You are using the wrong input channel. You must use channel 1 input to get the failsafe managed by the PPM encoder AVR.
Channel 5 is a direct PPM input to the main AVR, it is not connected at factory. i suppose you did some soldering behind the APM 2.5 board to get that working.
If you use channel 1 you don't need any APM modification. Just add a jumper.
Check it in the Wiki :
http://code.google.com/p/arducopter/wiki/PPMsumRC?ts=1330332797&...
From the PPM encoder manual :
------------------------------------------
PPM passtrough mode
------------------------------------------
If your receiver has a PPM sum signal output, it is now possible to pass on the PPM signal from servo channel 1 to the PPM pin (APM atmega1280/2560 PPM decoder).
To enable PPM passtrough, short the servo input channel 2 & 3 signal pins together using a jumper strap and use the channel 1 signal pin as PPM input.
Please note that the PPM sum signal must be standard 8 channel PPM to work with the APM PPM decoder.
In this mode on the APM 1.4, the blue LED will blink like this : Long - Short - short
--------------------------------------------------------------------------------------------------
Are you connected using a single PPM wire ? Where did you connect it ?
If you are using channel 1 APM input and PPM encoder passthrough mode, you should have a failsafe when disconnecting the RX or when no more signal enter channel 1.
The failsafe values are 900 for throttle, 1555 for channel 5 (flight mode), and 1500 for other channels.
This failsafe will trig only if the signal is fully missing. You should program a failsafe in your receiver as well for more safety.
Some receivers do have 2 modes for PPM sum output : direct mode, where the PPM sum signal is forwarded without modifications, and computer mode, where you can set individual channel failsafes.