Hi,
I'm building my first quad, and one of my Littlebees does notspin the motor on low throttle, sounds pretty awful. Check it out:
https://goo.gl/yUCGcA
Motor works fine on other ESC, all of the rest ESCs start to spin motors (without that shrieking) on 1158 throttle.

Do you know what might cause that? Is that a faulty ESC?

This sounds like a desync issue. Did you try to calibrate those escs?

EDIT: btw 1158 is a very high value for a motor start.

No, not yet. Have to read about that .)
It looks like after flashing newest blheli it acts a little bit different:

https://goo.gl/jiwgpO

i have to google that beeps at the end .)

EDIT: Calibrated, now they start making those terrible noises at lower throttle ,)

Oh. After calibrating no longer one of them behaves that way - now two (no1 and no3)

In blheli, the default min throttle value is set to 1148 if I remember correctly, and it is way too high. Motors twitch, have trouble syncing, hurricanes hit and zombie apocalypse starts

Set your betaflight this way:

• min_throttle to 1000,
  
• max_throttle to 2000,
  

take your props off (I don't see any, but better safe than sorry), go to motors tab

• click 'I understand the risks'
  
• set 'master' slider to 2000 (and don't click anything else) - this sets max throttle
  
• plug in the battery, you will hear beeping (sounds like like this "tudu tudu tudu tu ti di tu ti di tu ti di" LOL). When it stops, drag the master slider to 1000 i a one quick move (or press end or home I don't remember).
  

When it stops beeping, your min and max is set in every ESC, unplug your battery.

Set 1070 as your min_throttle in betaflight (this is default and is a safe value). Save and test.

Tip: You can increment throttle slowly in motors tab by clicking the slider and using up and down cursors on your keyboard.

EDIT: your min throttle in betaflight should be higher than in all ESCs.

(07-Apr-2017, 10:42 PM)KonradS Wrote: In blheli, the default min throttle value is set to 1148 if I remember correctly, and it is way too high. Motors twitch, have trouble syncing, hurricanes hit and zombie apocalypse starts

Set your betaflight this way:

• min_throttle to 1000,
  
• max_throttle to 2000,
  

take your props off (I don't see any, but better safe than sorry), go to motors tab

• click 'I understand the risks'
  
• set 'master' slider to 2000 (and don't click anything else) - this sets max throttle
  
• plug in the battery, you will hear beeping (sounds like like this "tudu tudu tudu   tu ti di   tu ti di   tu ti di" LOL). When it stops, drag the master slider to 1000 i a one quick move (or press end or home I don't remember).
  

When it stops beeping, your min and max is set in every ESC, unplug your battery.

Set 1070 as your min_throttle in betaflight (this is default and is a safe value). Save and test.

Tip: You can increment throttle slowly in motors tab by clicking the slider and using up and down cursors on your keyboard.

EDIT: your min throttle in betaflight should be higher than in all ESCs.

Yes, it seem after calibrating second ESC gave up? Now it looks like here:


Motors 1 and 3 work fine on ESCs 2 and 4. Double checked soldering job between ESC 1 and 3 and PCB too.

How are your escs soldered to the fc. Are you using both signal and gnd wires?

(08-Apr-2017, 01:50 PM)KonradS Wrote: How are your escs soldered to the fc. Are you using both signal and gnd wires?

Both signal and ground is used - saw some posts about noise issues without ground. ESCs are on short leads directly to PDB.

I have some littlebee's on an F1 board wired similarly (signal and ground) where I was having issues. Turns out, I removed the ground from the PDB to FC (just leaving +5V, and leaving the ESC grounds attached) and that solved it for me. I was told that I was probably getting some sort of ground loop.

(08-Apr-2017, 03:02 PM)sloscotty Wrote: I have some littlebee's on an F1 board wired similarly (signal and ground) where I was having issues.  Turns out, I removed the ground from the PDB to FC (just leaving +5V,  and leaving the ESC grounds attached) and that solved it for me.  I was told that I was probably getting some sort of ground loop.

I gave it a shot. Now I've tested one of the not working ESCs using longer leads from  PDB, and with only +5V connected to FC (Ground only from ESC). No changes.

Can you test one of the bad escs by hooking it directly to the rx ch 3 (throttle) and test without having the fc in the way?

(08-Apr-2017, 03:56 PM)KonradS Wrote: Can you test one of the bad escs by hooking it directly to the rx ch 3 (throttle) and test without having the fc in the way?

I'm on IBUS, would have to switch to PPM for that, right? Is it the same signal as for servos? If so, I have a servo tester somewhere, could use that maybe.

But I tested wrong ESC on different FC outputs, good ESC on wrong ESC FC output, and it looks liek ESC is the culprit.

PPM won't work - PWM from a servo tester will

Did you try changing motor timing? It is set to medium from what I see. Try med-high.

EDIT: that usually fixes issues in flight... but I'm out of ideas...

Tried all of the different settings. No improvement. I guess this is just an unlucky batch from the chinese, 50/50 broken...

Thanks for all the help anyway, I really had a hope I will finally attempt to fly this weekend - but it seems it's not my time yet .)

Sorry I couldn't help. Ideas anyone?