# Flight Core PWM ESC Calibration

Source: https://forum.modalai.com/topic/212/flight-core-pwm-esc-calibration
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2021-04-27 00:14:00 UTC by kiprock
Replies: 3 · Views: 1114

## kiprock · 2021-04-27 00:14:00 UTC

Trying to follow the [recommended documentation for ESC calibration](https://docs.modalai.com/flight-core-pwm-esc-calibration/)
```
  You should hear a second jingle.

  Wait for the second calibration jingle to complete.

  After the second jingle stops, press [ENTER] to proceed
```

There is never a second jingle.. I am not sure the calibration completed. The drone is shaking violently with the voxl flight core, but flies stable with a PX4. I switched back and forth to be sure that the extra weight is not an issue.

## Reply by modaltb (ModalAI staff) · 2021-04-27 15:11:37 UTC

Hi @kiprock,

I've not had oscillations myself from ESC cal issue, more generally from PID tunings (I experienced the same when I tested on a tiny frame and had the m500 PID settings still on board).  I really lower all PID settings (roll,pitch,yaw) and then slowly bring everything up.

Other's might chime in that are much better at tuning than myself, but here's an example of a smaller frame's settings (https://gitlab.com/voxl-public/flight-core-px4/px4-parameters/-/blob/master/platforms/v1.10/useeker_v1_config.params#L88)

Are you using the FlightCore FW that shipped with the unit or did you update it?  We noticed that with v1.11 there was a change and there's [this script](https://gitlab.com/voxl-public/flight-core-px4/px4-esc-cal-tool/-/blob/master/px4-esc-cal-tool-v1-11.py) that seems to work better.

One way around the ESC calibration is if the ESCs support DShot to use that as it's a 'digital' interface.

## Reply by John Mccarty · 2021-11-02 13:01:32 UTC (in reply to modaltb)

hello I have the same issue on (hexacopterx) there is no second jingle I waited around 10 minnutes but it still doesnt second jingle.After this calibration just 2 motors are working.What can I do do you have any experience about esc calibration of hexacopterx on voxl?I am using tmotor esc.

## Reply by modaltb (ModalAI staff) · 2021-11-08 14:27:32 UTC

Hi @John-Mccarty , checking in to see if you've progressed at all through this?  The process is a little picky and sometimes requires a few tried.