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Hello everyone. I got a problem with a Power HD LW-20MG Digital Servo. When I connect it to the power supply set to either 4.8V or 6.6V, the servo wiggles back and forth. PWM is supplied from STM32 Nucleo Board. Its frequency is set to 333Hz and the width of the signal is set from 800us to 2200us where 1500us is the middle position. However the servo wiggles despite the position in which it is set. Amplitude of PWM is 3.3V as it’s supplied from STM32, but we tried connecting it by optoisolator so that PWM is also 4.8V or 6.6V, but it didn’t change a thing. What could be the problem? Thank you for your help in advance.
 

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Does it do it continuously or eventually stop?

Are you using a capacitor anywhere in the connections?
 
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