Hi guys.
We have a problem with the Mini Maestro 24.Channel and Savoc servos model: Savox - SV-1232MG.
When we move the servo (from pololu maestro panel control) often starts to vibrating and buzzing sound (jitting), and sometimes it do the same when we move other servos attacched to the pololu.
In the Pololu there are attacched two Savox - SV-1232MG (both have the issue) and another Savox much powerfull that works fine.
By using a servo tester we don’t have this problem so the issue is related with the pololu, we both tried to put a 4.7Kohm pull-down resistors (like said in this old thread Servo does not stop) and other things from this thread: Mini Maestro-18 random jitters with servo TowerPro SG90
It exist a way to stop the jitting?
Hello.
I am sorry you are getting jitter when controlling your servo from the Maestro. It sounds like this could be a power issue. Can you tell me more about the supply you are using? What voltage are you supplying and how much current can the supply handle? Do you get the same jittery behavior if you remove all the servos from the Maestro except for a single SV-1232MG?
By the way, the pull-down resistor recommended in that thread you linked is not necessarily applicable in this situation. That issue was for someone using one of our older micro serial servo controllers (which are very different from the Maestros), and that person’s twitching was a direct result of the controller resetting, which does not seem like the case for you.
-Jon
Thank you for the answer.
About the power supply, The pololu is powered by an arduino MEGA and it has connected a lithium battery of 7.4 Volt and 5000 mAh. In the meantime we tried as you suggest to try only one SV-1232MG but however the jitting persist.
Can you post your Maestro settings file? You can generate a .txt file of these settings by clicking File > Save settings file… in the Maestro Control Center. Can you also post a video that clearly shows the behavior you are getting, as well as the connections in your system?
By the way, if you are connecting your Maestro to your computer, its processor is already getting power, so you do not need to supply power to VIN.
-Jon
Here are the video and the file: https://mega.nz/#!XsRWAaxT!gLe4drmJx4t3IKiJQZfBbtk3eWWNh-6OIE69uOKj9yk
And yes, we know that with the computer we don’t need to supply the pololu from the arduino!
It is difficult to be certain from your video, but in the first 10 seconds or so, the servo horn does not appear to be moving, though I can hear a buzzing noise. In the latter half of your video, the servo appears to move in a way that matches how you are adjusting the target.
We generally use the word “jitter” to refer to behavior where the servo’s output is moving back and forth with small movements despite being sent a constant servo signal, which does not seem like the case here. Since the audible noise you are hearing seems to grow quiet as the servo adjusts its position, it could be from the servo’s internal control electronics trying to maintain the position of its output. If that is the case, there is not really much that can be done to address that noise. It could continue or change pitch or stop altogether when a load is applied to the output.
-Jon
Yes, the servo don’t change its position but its temperature grows up and we don’t know if this could damage it.
If heat and noise are the only things you are concerned about, your servo could be working normally.
It is possible that a servo could be damaged from excessive heat, but getting warm during operation is common. How likely the servo is to be damaged probably depends on how hot the servo is getting and on the particular details of your servo. I recommend checking with the manufacturer if you are worried.
-Jon
We solved by turn off servos when they are not used.
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