Problem to control servo motor

[Anonymous]

 Hi everybody!!

actually i´m working to control a servo motor i read that the frecuency is 20 hz and the duty cycle is 1,1.5 and 2 ms
i´m using pwm16:

   

parameter pwm16
clock = 1,000,000
period= 49,999
duty cycle = 999-> 1ms->0°
                     1499-> 1.5ms -> 90°
                      1999 -> 2ms -> 180°

but the servo doesn´t work correctly don´t go to the correctly position and keeps vibrating and i don´t understand why,so if someone help me i´m really be glateful
i put my code if someone can check it

 

[ETRO_SSN583 · Accepted solution]

I have some ref material I can send you, but it is 13M in size, so I need

   

your email address. Mine is danaaknight@gmail.com

       

Regards, Dana.

[Anonymous]

 thanks a lot!!  my gmail is mobrfco@gmail.com

[Bob_Marlowe]

Your calculations seem to be correct, so let us see a bit more and post your project here, so that we all can have a look at.

   

To do so, in designer 5.3 ( I hope you already updated to, if not, do it right now) do

   

Build -> Clean Current Project

   

File -> Archieve Project (minimal)

   

and then upload the resulting archive here.

       

Happy Zipping

   

Bob

[ETRO_SSN583]

Ref material forwarded this morning.

       

Regards, Dana.

[Anonymous]

 It seems that a lot of servos works at 20mS period. Not sure if the is the case, have a look.

[Anonymous]

 Hi bob

   

here is my code it is simple beacause first i want control corectly the servo and then do an aplication
my servo is  a mg995, a friend prove with  an arduino and worked corectly so i decided control in psoc.

[Bob_Marlowe]

Can you try to reduce the period to 19999 giving the required 20ms for the servo.

   

Another issue might be the power supply: the PSoC supply and the servo should be different sources only connected by GND.

       

Bob