OpenMV Cam M7 and servos

OpenMV Boards
1

Hello, I am a recent user of OpenMV cameras and I would like to control two servo motors of a turret.
My servo motors are on pins P7 and P8.
They are powered at 5V by an external power supply with common GND.
I use voltage translators 3.3V-5V between the OpenMV and the servo motors for each control signal.

When I use the pyb.Servo library, I can’t drive them at all, worse I don’t have any PWM signal at the output of pins P7 and P8.
On the other hand, when I keep the same wiring but I use the Timer library in PWM mode, I manage to make my two servomotors work perfectly!

Do you have any idea about the origin of this problem?

Thanks in advance,

Mike

2

It might be that the our code library is bugged. Can you post your code? Micropython breaks things when we update.

3

Hi,
Thank you for your answer.
In fact, the examples I tested are those provided in the online help and in the IDE (see attached screenshots).

OpenMV - servo example
OpenMV - servo example764×648 66.6 KB

I hope you will find what’s wrong :wink:

Mike

4

And the second one

OpenMV - servo example 2
OpenMV - servo example 2951×386 38.6 KB

5

Hi, can someone please help me ?

Mike

6

Which camera version? I have time to check right now. H7 or H7 Plus?

7

Hi, not H7 or H7 plus, just M7.

Thanks

8

Works with the latest firmware on my M7. Please update the IDE and your firmware.

9

It seems to me that everything is up to date. I don’t have the material at hand at the moment.
I’ll test again in a few days and let you know…
Thanks again.