Comment by George on May 17, 2012 at 9:04pm

Thanks for your work on this mate. It will be a great help.

Developer Comment by Sandro Benigno on May 23, 2012 at 1:40pm

Veery nice, Airmamaf!

So, finally I'm getting a little better from the last surgery and I restarted to work on RSSI and MAVLink 1.0 support. I love to see what you've done. Officially, I need to follow APM progress on it in favor of people that don't compile the firmware by themselves. It means that we'll need native support from APM and MPlanner on providing RSSI reading and also on scaling RSSI percent, save the setup to the EEPROM, etc.

I still didn't find infos enough about RSSI on my radio. What RC are you using? I'm now installing a ChainLink Dare on a FlySky Radio.

Comment by Eugene Potapov on May 23, 2012 at 2:25pm

Does it support MiminOSD 1.0 hardware?

Comment by George on May 23, 2012 at 2:48pm

Sandro, Just a note for scaling, nearly all radios will be different with respect to RSSI voltage values (from my experience) so maybe a tab in the set up page of mission planner requiring user to have radio on near plane for full signal sample, then switch Tx off for low signal sample. APM planner can then auto scale 0 - 100% giving the user an option to enter a margin value to their taste. ie A 10% margin value has the displayed RSSI reading 0% at 10% above Tx 'switched off' sample. Just thoughts anyway, glad your better too mate.

Comment by George on May 23, 2012 at 2:59pm

Also, looking at your Chainlink, to obtain an RSSI voltage should just be a case of looking at the voltage between the middle pin and grd pin of the connector next to the 'Com port' connector (labelled as "SPPM VRSSI GND" in the manual). You should just see a voltage range between about ~0.9v and ~3.3v?  

Comment by airmamaf on May 23, 2012 at 3:12pm

Hi Sandro, glad to see you're getting better, I get RSSI from my Turnigy 9x receiver as describe here RSSI from TGY 9x and I also made a simple rssi buffer.

About what just said George, it could be nice to have something in mission planner to calibrate RSSI, as we do for our radio, with for exemple max value (1m from receiver), min value (in microwave oven) and switch off value.

Developer Comment by Sandro Benigno on May 23, 2012 at 3:14pm

Got it... I'm worried on to know if it is linear or not. I mean, it would be nice if the RSSI voltage scale reflects a logarithmic based scale (dB) which would solve the problem of the non-linearity on the loss of power through the air.

Thanks by those infos on the 9X. And the microwave oven is a fantastic idea... =)

Developer Comment by Sandro Benigno on May 23, 2012 at 3:20pm

@George, about the ChainlLink... I hope so. I need to finish my install. If it's just a matter of read that ~0.9 to ~3.3v... I would just want to know if it's linear already.

Developer Comment by Sandro Benigno on May 23, 2012 at 3:37pm

@Eugene, MinimOSD hardware v1.0 is full firmware compatible with the old version. It just has a revised power circuitry with a switching regulator for improved cooling.

Comment by George on May 23, 2012 at 4:02pm

If it's just a matter of read that ~0.9 to ~3.3v... I would just want to know if it's linear already.

Not actually sure Sandro. If it helps, here is a video which displays raw RSSI voltage levels from a Dragonlink system from launch, out to about 5.7km. On the turn around it gets a bit erratic as electronics and battery get between Rx antenna an me. It may help you see how its scaled in the Rx.

https://vimeo.com/40007622

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