Making a 90degree Servo turn only 90 deg? Stop servos from spinning on reset?

Projects Programming
1

Hello,
I am having problems with making a servo (a Turnigy TGY one, it's not with me and I forgot the model number. It's meant to turn max 90deg) turn 90 degrees only, on a Romeo V2.
What happens:
Upon execution of the code, the servos spin a couple of rounds (presumably to get to pos 0?),suddenly stop, then proceed to go to 90 degrees.
What I wish to achieve:
Go to 90 degrees only, without the spinning around
I am using the following:

for(pos = 0; pos < 90; pos += 1)  
  {                                 
    servo90_1.write(pos);    
servo90_2.write(90-pos); 
    delay(20);                      
  }

I have also tried the following. But similar to the above, the servos start spinning from reset.

servo90_1.attach(servo90_1Pin);
servo90_2.attach(servo90_2Pin);

   servo90_1.write(90);              
   delay(100);   
  servo90_2.write(0);
       delay(100);                      
  
    servo90_1.detach();
   servo90_2.detach();

This is my first time programming so please bear with the clunky code. It's modified from a tutorial code with new additions.
The purpose is to build a robot which can achieve a series of tasks, one of which is collecting balls, and I'm lifting a ramp in order to do so.

I've provided the full code used, and it includes automated actions of the robot with the option to override with RC.

Please advise.

servos_pos.txt (11.7 KB)

2

If the servo spins round, then it is not a servo in the normal sense of the word. They are physically incapable of turning round, they are typically limited to a half a circle.

If you have a continuos rotation servo, then you must do something to get the position feedback. Of course, this may be a fancy new servo I haven't heard of, so give us a link / datasheet.