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Discussion Forum

Bad Baro Health

Started by Sandy Thomson. Last reply by Madhu Nuggehalli yesterday. 3 Replies

I have a problem with Arduplane 3.x and Mission Planner. When I run Arduplane 3.x I am getting a "Bad Baro Health" message in the Flight Data HUD and when I run the "airpressure" test in the CLI I…Continue

Crabbing in telemetry

Started by Phelps Williams. Last reply by Phelps Williams on Friday. 1 Reply

I've been reviewing tlogs from a recent outing and I am having difficulty finding evidence of the crabbing I observed while the aircraft was in auto flying waypoints.Between VFR_HUD.heading,…Continue

DO_CHANGE_SPEED throttle_cruise vs airspeed_cruise with and without airspeed sensors

Started by Phelps Williams on Friday. 0 Replies

I've been reading over the ArduPlane 3.2.1 code trying to dig out the difference between the airspeed_cruise_cm and throttle_cruise parameters manipulated by DO_CHANGE_SPEED while flying waypoints in…Continue

where can i buy a penguin?

Started by Damo. Last reply by Istvan Fekete on Thursday. 14 Replies

I want to buy a spare finwing penguin in europe but i have seen no website that has them in stock. Does anyone know wher these can be purchased?Continue

Comment Wall


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Comment by Bill Bonney on January 10, 2015 at 10:14pm

You need to set the ARSPD_PIN parameter = 65 for it to work 

Comment by healthyfatboy on January 10, 2015 at 7:40pm

Great to know! I guess I forgot there's also I2C on the APM2.

Comment by Andrew Tridgell on January 10, 2015 at 1:25pm

The I2C digital airspeed sensors do work with APM2.

Comment by healthyfatboy on January 10, 2015 at 11:33am

If you don't currently have an airspeed sensor, you have to turn that off in the optional hardware menu. You're seeing junk data because it's reading whatever noise is on the analog pin and interpreting whatever it sees.

You can't calibrate something that's not there and dial it in. The board is just seeing a bunch of noise.

The APM2.6 can't use the digital airspeed sensor. Just get an analog one and follow the Wiki/Manual and it'll tell you how to get it connected and set up. Then go to the airspeed tuning section of the manual and get that going as well.

Comment by Patrick O'Neill on January 10, 2015 at 10:40am

Thanks for the responses guys! So turn off Airspeed Sensor in MP where? and I do want to know my AS indicated and have only seen the analog sensor by 3DR and  pitot tube variety. Please link me the "digital" ASs unit option.

So then...what would cause my current AS to be so way off and jumping round-aboutly. Can I manipulate the params to dial it in or is there possibly an outside interference of sorts to consider?

Thanks again, Patrick

Comment by Gustav Kuhn on January 10, 2015 at 1:30am

Coming from a gliding background, yes, the airspeed sensor is almost essential in a plane.

Secondly, APM 2.x and all it's clones uses the analogue sensor.

As does the old APM 1.x, yes, I still fly those !

Comment by Josh Welsh on January 10, 2015 at 1:21am

Are you certain the digital airspeed sensor works with the APM?  I thought that was Pixhawk and above..

Comment by Grant Morphett on January 9, 2015 at 9:04pm

Hi Patrick.  An Airspeed Sensor is a good idea as without it the APM is "estimating" the airspeed from the other sensors.  Make sure you get a digital one though.

Thanks.  Grant

Comment by healthyfatboy on January 9, 2015 at 6:31pm

If you don't have an airspeed sensor, you can't calibrate it. Just turn off the airspeed sensor option in MP and those readings and warnings will go away.

For the best performance, it's good to have an airspeed sensor but you can get by without one as well.

Comment by Patrick O'Neill on January 9, 2015 at 2:31pm

Hi all!

Patrick in California here!  I am a new APM2.6 user and have set it up in one of my creations. As of now I use 3 flight modes, which all work well, to get to know her better. They are, Manual, Stabilize, and RTL.

Hardware is; PM, MinumOSD, APM2.6 with external uBlox Neo GPS plus compass, and 915ghz 3DR telemetry. All controlled by FrSky DHT hack in an Airtronics RDS8000 radio.

Point is here...I like!

So I am tuning her up and have run into the age old question of, to buy an airspeed sensor or, not to buy an airspeed sensor. Currently airspeed is all over the place in the HUD and with WARNINGS of STALL! all the time with no clue how to calibrate it in. Some just buy a AS sensor and pitot tube and figure it out. But I have come across The MatrixPilot stuff and am intrigued.

Question is here...what to do? Does the MatrixPilot just download to the APM and is ready to use?

Thanks for being there guys, Patrick



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