Replies to This Discussion

3D RoboticsPermalink Reply by Chris Anderson on September 5, 2011 at 7:48am

2.8 was just a fun experiment by Jason Short to make the legacy ArduPilot code more like the APM code, but it's incomplete. He's 100% focused on ArduCopter now and we've got more new projects in the pipeline, so it's unlikely he'll come back to it, but you never know. 

 

Why do you need it? The last public version--2.7--is very functional. 

Permalink Reply by Evan Evans on September 5, 2011 at 7:51am

But it still has issues with arduimu see my other thread.

 

Evan

Permalink Reply by Alexey Kozin on October 18, 2012 at 10:40pm

i make two versions of firmware for legacy ardupilot for rtl my small fpv plane

download here

2.7 with fixed navigation error bug and "tremor" of elerons tested in xplane & real fly

2.8 beta fixed bugs, tested in xplane & real fly too

Permalink Reply by R. Otto on October 20, 2012 at 10:40am

Version 2.8 is full of surprises! I start normally. Fly from waypoints. In manual landing suddenly does the pitch command backwards. The copter falls naturally into the grass.

Permalink Reply by Alexey Kozin on October 22, 2012 at 12:52am

maybe you mistook last Arducopter 2.8 firmware for ardupilot-mega and arduplane 2.8 for legacy ardupilot @ atmega 328 cpu?

Permalink Reply by Charles lakins on October 22, 2012 at 12:25am

will the overwriting the libraries with these ones make older versions not work/compile right ?

Permalink Reply by Alexey Kozin on October 22, 2012 at 12:45am

im make new copy of clean arduino ide software (version 0.22 for legacy AP) for each version of firmware, copy libraries, rename arduino.exe to arduino_ap_28.exe and use "open with" windows dialog on pde file

Permalink Reply by Charles lakins on October 22, 2012 at 12:52am

ok thanks

is there a way to reduce the airspeed sensitivity? mine peaks with just minor wind (scale set to 180)

i even set scale to max 8000klmp/h and at light wind it goes to 781klmp/h and a pinch peaks it

Permalink Reply by Alexey Kozin on October 22, 2012 at 1:19am

void read_airspeed(void)
{
    #if GCS_PROTOCOL != 3
    airpressure_raw = ((float)analogRead(AIRSPEED_PIN) * .10) + (airpressure_raw * .90);
    airpressure     = (int)airpressure_raw - airpressure_offset;
    airpressure     = max(airpressure, 0);
    airspeed         = sqrt((float)airpressure / AIRSPEED_RATIO) * 100;
    #endif
    
    airspeed_error = airspeed_cruise - airspeed;
}

I think the need to increase AIRSPEED_RATIO parameter

Permalink Reply by Charles lakins on October 22, 2012 at 1:28am

where would i put that? in AP_Config.h under arplane speed control header under ratio

or how much should i increase the ratio too?

its presently:

// Airplane speed control
#define AIRSPEED_CRUISE 13  // meters/s : Speed to try and maintain - You must set this value even without an airspeed sensor!
#define AIRSPEED_RATIO 0.1254 // If your airspeed is under-reporting, increase this value to something like .2

I tried .2 it didnt help

Permalink Reply by R. Otto on October 22, 2012 at 2:01am

Subject: Incorrect effective direction Nick. I downloaded the software again. (Of course it was always the Copter software). So far it works. Why the pitch direction has inverted flying will remain an uncertainty.

Permalink Reply by Alexey Kozin on October 22, 2012 at 4:20am

airspeed sensor with dual pipes & pitot ?

try increase AIRSPEED_RATIO propotrional error

 

as example wind is 5m/s  swown as 15 m/s   15 / 5 = 3 times

if AIRSPEED_RATIO =0.1254 

0.1254 * 3 = 0,3762 - its new value for AIRSPEED_RATIO

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