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Drone so unstable it cant take off

Discussion in 'General Technical Talk' started by Hasslefish, Apr 15, 2018.

  1. Hasslefish

    Hasslefish New Member

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    So i just got done rebuilding my drone. replaced my 4 in 1 esc with individual DSHOT 1200 escs. they are makerfire blheli_32 escs. i also just upgraded to the most recent betaflight with dshot commands. my flight controller is a sp racing f3. Earlier today i was trying to fly and it would just flip out every time i gave it throttle. turns out my board orientation was set incorrectly so i fixed that. it is now set up properly but every time i take of it is so unstable that i cannot stay in the air. I normally fly in acro mode but even in angle mode i cant get it off the ground. please help.

    update: so i just found a little more information that might help. when i spin up the motors in beta flight some interesting stuff happens. when i use the master to spin up all four motors motor 4 doesnt spin up until about half throttle. when i spin up ONLY motor number 4 it works just fine. if i spin up motor number 4 and leave it at low throttle then spin up another motor them motor 4 stops completely. almost like the other motors are sucking power from motor 4.

    update 2: i was just playing around in the betaflight motors tab. i noticed that when i use the master throttle slider and i turn it up and then turn it all the way down to zero the motor beeps as if i was arming the quad. every single time i give it throttle and then cut it off it beeps like i was arming it
     
    #1 Hasslefish, Apr 15, 2018
    Last edited: Apr 16, 2018
  2. theGreenOrange

    theGreenOrange Well-Known Member

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    Do they work in multishot? If you havent tried muktishot and calibrated the ESCs, try that (for troubleshooting).
     
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  3. Hasslefish

    Hasslefish New Member

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    well to be honest it was late and i was frustrated so i hadnt even though of changing my esc protocol. i just tried dshot 600 and everything worked just fine so i didnt see the need to even go back to multishot and try it out. Although i have no issues running dshot600 i am still curious as to why 1200 wont work. here is a cli dump with dshot 1200 enabled if that helps
     
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  4. theGreenOrange

    theGreenOrange Well-Known Member

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    How clean is the ESC signal wiring? Is there a separate signal ground wire in place?
     
  5. Hasslefish

    Hasslefish New Member

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    Each esc has it's own signal ground wire
     
  6. theGreenOrange

    theGreenOrange Well-Known Member

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  7. Hasslefish

    Hasslefish New Member

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    Dshot won't work on pin 4 at all? Even though everything seems to run smoothly on dshot600 are there issues that I am just not noticing.
     
  8. theGreenOrange

    theGreenOrange Well-Known Member

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    I'm not 100% sure but I had an emax fc where one motor pin didn't have a timer so that pin could not do DMA. I had to remap it to the LED pin to get it working. But mine would not work on dshot600 so I dont know why yours works with 600 since both 600 and 1200 need DMA to work. Did you fly it with 600?
     
  9. Hasslefish

    Hasslefish New Member

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    Haven't flown it yet, just haven't had the time. But I did a couple full throttle punches with no props on and everything seems to be working fine.
     
  10. Hasslefish

    Hasslefish New Member

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    So I was finally able to get a flight in. Dshot 600 works beautifully. Low throttle, full throttle. Everything works great
     
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