Gents I need your help.
I recently upgraded one of my 2.6APM powered quads to a Pixhawk. One of the reasons I went ahead and did this is because the Pixhawk is supposed to take PWM RSSI signals directly (into the Sbus port aka Pin 103) and I could ditch my PWM to analog conversion circuit is used in my APM.
I have verified that my EZUHF receiver is outputting RSSI in PWM form on one of the channels. (it will move a servo appropriately when the RF gets weak or disappears... and it worked fine for the APM as an RSSI input via a PWM to analog conversion circuit)
And, I have hooked up the PWM RSSI output to the Sbus port (pin 103).... it does nothing. Shows zero RSSI on the OSD no matter what.
I can't find any useful description of how to configure this in the wiki, mission planner or this site.
How do you make a Pixhawk show RSSI from a PWM input on pin 103 as its advertised?
Thanks for your help.
You have done nothing wrong.
Unfortunately the RSSI is inverted with the EZUHF.
In the movie you will see that I chose to use Link Quality which is non-inverted and responds to degradation from interfering signals. In my opinion Link Quality is the better choice anyway.
trying to set this up and I find when I assign EZUHF LQ to channel 8 I lose my flight mode selection
Using the latest APM plane on an APM 2.6
Any clues Gents, this is driving me spare!
I moved my flight modes to a different channel.
Look a about time code 2:17 in this video for the schematic and explanation:
I have watched your Video a couple of times, very well presented
I am using CPPM and want to keep it that way
My problem is I cannot figure how to switch my Flight mode select channel to anything other than Channel 8 (I'm using Arduplane 3.2)
I note in your schematic you use channel 6, how did you change that from what appears to be the default of channel 8
To confuse the issue more the current setup wiki says to use channel 5 which doesn't work for me
I changed the flight mode channel input from the default 8 to 6 in the mission planner and then wrote the settings to the APM.
Please forgive my stupidity but I am asking how to do that
What parameter are you changing and where do I find it?
for the nth time I looked and found it
all good now, many thanks David
Oh! well I am glad you found what you needed.
You would think it would be on the flight mode screen, right? But noooooo way.
Just to recap for others, I changed the flight mode channel under config/tuning under the full parameter list. Look for FLTMODE_CH. (APM must be connected first)
Where did you find it?
I had looked in Mission Planned a few times with no luck, it must have been sticking in my face. I remember looking at the param's at the four major flight controls assignments which are the very next ones. DOH!
Funny, the first time I looked at the list in the wiki I found it straight up
Must be dyslexic or something :)
Thanks again for your help
I would like to share my story to get this to work. I followed everything in this thread with no success so far. Until today.This might help other people as well.
I was struggling with getting EzUHF RSSI to work on MinimOSD-extra. Today I got another OSD unit, with the same result. That made sure it was not in the OSD I had already.
Then I went on searching. One more time through all settings. At the end I decided to take a good look at the SR2 settings. There's also a channel setting. I changed the value here from 0 to 8 and, voila, working! I changed it back, not working again. So, it was all in the SR2 settings. My Minim is connected through SR2. Since everything else was working here I never expected to look in that setting. I had to change some other stuff there to get it working in first place. This was before I started working with RSSI. Never thought there was a channel setting in there. Anyways, it works now.
The settings which work for me:
RSSI_RANGE 3.3 (no matter, will not used anyways)
PPM 8 LINK
CH1 PPP Muxed
All others, default
RSSI channel Channel 8
RSSI Min 1056
RSSI Max 1793
RSSI Warning 60%
Of course in the panels also RSSI enabled
I know this is a thread relevant to Pixhawk, are your findings for a Pixhawk or APM setup?