I want to drive servo motor with PWM signal.Servo motor rotation angle changes with the ratio of the duty cycle.Generally , servo motor rotation angle according to PWM can be seen in figure below.enter image description here

Suppose that

  1. I apply duty cycle with 1ms but Vmax=12V and V min =-12V
  2. I apply same duty cycle but Vmax=12V and Vmin=0V .

In both cases ,will I obtain same rotation angle on the servo motor?If not ,Is there spesific Vmax and Vmin voltage to rotate servo like in figure above?

  • \$\begingroup\$ What device are you using that utilizes PWM? (e.g. is it an Arduino, etc.?) \$\endgroup\$
    – user103380
    Commented Dec 24, 2017 at 20:25
  • \$\begingroup\$ what does this mean? servo motor \$\endgroup\$
    – jsotola
    Commented Dec 24, 2017 at 20:26
  • \$\begingroup\$ I obtain square wave by using negative resistance converter with capacitor then I integrate square wave by using integrator op amp and finally by comparing integrator output with reference voltage I obtain PWM \$\endgroup\$
    – distortion
    Commented Dec 24, 2017 at 20:27
  • \$\begingroup\$ Some motors are polar and others are bipolar for supply and control. Which do you have? \$\endgroup\$ Commented Dec 24, 2017 at 20:30
  • 2
    \$\begingroup\$ If you apply +/-12V to a 4.8V servo you probably won't get rotation. Smoke, maybe. \$\endgroup\$
    – user16324
    Commented Dec 24, 2017 at 23:25

1 Answer 1


According to manual... which you can find on web enter image description here

Degree (') Position for 50Hz cycle rate.
-90 ' ~1ms pulse - all the way to the left
0 ' 1.5 ms pulse - in the middle
90 ' ~2ms pulse - all the way to the right.

  • \$\begingroup\$ those wire colours are not standard, red/black/white, and other schemes, are also used. \$\endgroup\$
    – Neil_UK
    Commented Dec 25, 2017 at 5:35

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