DJI M600 Pro esc working with PWM input

[SteffGo_FPV]

I was looking for a solution to use DJI M600 Pro escs with a regular PWM input from any FC.
I found a few topics about it like:

Pixhawk with M600?

Has anyone made progress on this?

And

E2000 Pro (sort of) ESC Flash

@NM78, Thank you for your input on the matter. My experience agrees with your prognosis. I’m keen to hear if anyone has anything further to add. If the ESCs do use CANbus then I wonder if there is some message that has to be sent inconjunction with the PWM input.

But it seemed to me, that nobody found an easy solution.
So I tried myself and just got it working.
Unfortunately I just created my account so O cannot reply to the previously mentioned topics… I think.

If someone is still interested, I think I am able to help.

[alexander_rietz]

Hi Steff, I would like to hear more about your solution. Just got hold on some E2000’s and would like to see them spin.

[SteffGo_FPV]

Hello Alex, so it is actually pretty easy. The ESC expected an inverse PWM signal.
Additional the signal limits need to be set to 1100 and 1900.
Unfortunately I cannot check the other settings, since I killed my FC on a different project with a crash.
For the signal input I used the PWM signal pad on the eSC itself, not the regular cable. Next to this pad is a GND pad I used to complete the signal cable.

Please come back to me if you need more help.

[Halfeld (Ricardo Halfeld)]

Checking in to let anyone interested know we’re about to start such a conversion. Thanks for everyone who shared their experiences. We’ll do the same.

[Ikhmal_Alif]

Hi, can you elaborate this more. I am having problem which when I gave a slight yaw input, the motors output went to full yaw output. The copter does not stop yawing. Haven’t set the MOT_PWM to 1120-1920 and RC_SPEED was at default 490Hz.

Copter : DJI Agras MG-1P
ESC & Motor : E2000 Pro
Pixhawk : 4.0
Firmware : 4.1.2

[Halfeld (Ricardo Halfeld)]

I take it you simply sent PWM and that was enough to get the motors spinning, even if it is not flying right. Is that correct?

[Halfeld (Ricardo Halfeld)]

By inverse PWM signal you mean:

• HIGH/LOW swapped or
• 1100 being full throttle and 1900 min throttle?
• something else?

Also, you said:

…I used the PWM signal pad on the eSC itself, not the regular cable.

I suspect you are talking about the small test pad pointed out in the picture. Right?

[sri_ram]

Hi I am using DJI agras mg-1s how to use the esc with normal battery setup

[Halfeld (Ricardo Halfeld)]

We are currently trying to reverse engineer the communication protocol between the A3 controller and the ESCs. Our efforts to run the motors with PWM only have not been fruitful, although we might have missed something.

Tapping into the motor PWM control lines as reveals a somewhat typical signal, ranging from 1100-1900 microseconds, as indicated by other contributors to this thread.

The iESC port on the A3, however, seems to poll the ESCs using RS485. We have identified 6 pairs of bytes which are looking like control signals as well. We believe the ESCs have a custom firmware which expects both signals for whatever reason.

We are working on a microcontroller code to publish all data as ROS messages. As we progress I will report back.