Throttle on Pixhawk

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Chalagi

Member
I should have a linear throttle on my tx. I have re-calibrated my tx several times and still no luck and my 4 motors will not start until I"m almost at 1/2 throttle and then they are not in sync. But at 1/2 throttle or a fraction over the motor power is still the same even at full throttle. Is there a linear setting in the pixhawk? I am running these motors DYS BE4108 580Kv with Taranis frysky and X8R rx with a 3S battery.
 

Old Man

Old Man

Active Member
Probably an end point issue. Set up your throttle channel end points with a low of ~1005 and high of ~1995, then re-cal your ESC's to the transmitter and see what happens.
 

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Chalagi

Member
My tx end points will only go down to -150 and +150. I took it out to fly this afternon and it flipped very fast. I checked the motor directions and they were ok and so were the correct props on the correct motors.
 
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cootertwo

Member
About the motor start thing, I don't know, but the flipping thing sounds like the wrong motors (ESC's) plugged into the wrong places on the Pixhawk. On smaller rigs, you can carefully hold the quad from the bottom, and with it armed and some throttle, move the elev, ail rudder sticks, and see if it's trying to go in the right direction. But I ain't recommending that. With 580KV motors, you are probably swinging some pretty big props!
 

Old Man

Old Man

Active Member
My first flight checks use the same control response methods, but I don't hold on to it. Just set it on a flat surface and carefully go through the control throws.

If his throttle is set up to use the full 150% both directions he'll have throttle problems. ESC's are usually programmed by the manufacturer to use a PWM count from 1 to 2, or -100, +100. If set at -150-+150 he has the throttle set outside of the functional range available to the ESC's, which would explain why his throttle responds the way it does.
 

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Chalagi

Member
I set the end points to -150 and +150 to calibrate my esc's I don't try and fly like that. I think that the flip was caused by uneven motor rpms so that made it flip. The esc's for motors #1 thru #4 are plugged into the correct pixhawk connections and my esc's have been calibrated. Yesterday why I tried to spin up the quad my ends points were -100 to +100. Maybe the problems is in the (THR_MAX) setting and I will check that this morning. My props are 12X3.8 on 3S
 


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Chalagi

Member
Yes i calibrated my tx again and also calibrated my esc's again. My problem is right now I don't have a linear throttle. I may have one or more esc's that have gone bad. I have one or more motors that lag some.
 



Hexacrafter

Hexacrafter

Manufacturer
We do not recommend to our clients that you calibrate all at once.
Sometimes they all do not go into calibration mode & 4 of 6 will calibrate.
I would test with all 6 plugged into the harness into RX and see if they all seem to act the same.
If not go back & re-calibrate one at a time & verify that each has calibrated.... hard to do with 6 ESC beeping at the same time...
 

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Chalagi

Member
That's what I did this afternoon I calibrated each esc on at a time. Plugged into the throttle channel of my rx and esc took the calibration and I spun each motor up using the throttle. The pixhawk for some reason seems to be working now as far as spinning up the motors. Now for the props and an outdoor little test. I doubled checked all of the esc connections and the sbus from the rx to the pixkawk and they are correct.
 

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