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.
Steve
Tags:
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!
Ross
I moved my flight modes to a different channel.
Look a about time code 2:17 in this video for the schematic and explanation:
Thanks David
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.
Got That
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:
Mission Planner
CH8_OPT 0
RSSI_PIN -1
RSSI_RANGE 3.3 (no matter, will not used anyways)
RC8_DZ 0
RC8_FUNCTION 0
RC8_MAX 1793
RC8_MIN 1056
RC8_REV 1
RC8_TRIM 1056
SR2_EXT_STAT 2
SR2_EXTRA1 5
SR2_EXTRA2 2
SR2_EXTRA3 0
SR2_PARAMS 0
SR2_POSITION 0
SR2_RAW_CTRL 0
SR2_RAW_SENS 0
SR2_RC_CHAN 8
EzUHF
PPM 8 LINK
CH1 PPP Muxed
All others, default
MinimOSD-extra
RSSI channel Channel 8
RSSI Min 1056
RSSI Max 1793
RSSI Warning 60%
Of course in the panels also RSSI enabled
RV
I know this is a thread relevant to Pixhawk, are your findings for a Pixhawk or APM setup?
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