Servo motor goes into default positions even after resetting the code

Using Arduino Motors, Mechanics, Power and CNC
1

Hello please help me out i am using servo motors
And everytime i use servo.attach function in setup
My servo goes into default positions (90 degree )
Even my void loop function is empty , i tried resetting the arduino , injecting blank code into the arduino but it does nt help me out my code is :

#include <Servo.h>

byte servopin1 = 2 ;
byte servopin2 = 3 ;
byte servopin3 = 4 ;
byte servopin4 = 5 ;
byte servopin5 = 6 ;
byte servopin6 = 7 ;
byte servopin7 = 8 ;

Servo servo1 ;
Servo servo2 ;
Servo servo3 ;
Servo servo4 ;
Servo servo5 ;

Void setup() {
servo1.attach(servopin1);
servo2.attach(servopin2);
servo3.attach(servopin3);
servo4.attach(servopin4);
servo5.attach(servopin5);
}

Void loop () {

//empty
}

Now everytime i run this this program my all servo motors comes in 90 degree default positions
Even i am not using any write function still it comes into 90 degree position.
Even if i manually change the positons by hand when arduino is turned off , then also when i give power compile the code in arduino , it agains comes into this default position. Please help me

2

That is how most servos work!
Paul

1 Like
3 
Void setup() {

Is it really like that, or is cut and paste broken?

4

There are several Arduinos and some differs from the most common. Which model do You use?
Search for examples regarding servo.h.

5

That is a chracteristic of the servo library. It starts creating servo pulses with attach. And the default pulselength is 1500 ms.

1 Like
6

You can do a servo write to your default position before you do the attach.

7

Void is not the same as void

8

I typed the code on mobile so its just typing error

9

I am using arduino uno r3 and now i get it , digital pins gives default 1500ms signal due to servo library
When servo is attached . thanks to you all for helping me out.

10

So, it isn't your actual code, so pretty much irrelevant.

11

That's so your model plane flies level with no inputs. That's what hobby servos are intended to do - if the radio signal drops out they should return to trimmed level flight until connection is re-established (the least bad option).

12

But thats not a property of the hobby servos, it's a property of the RC receiver. Therefore, it has no meaning here.
Hobby servos have no default position. If there is no pulse at the input they do nothing. In the sketch above, the servos only react to the pulses that the servo library outputs after the attach.

13

Ah, yes, that may well be, this could just be the consequence of calling attach().

Anyway the solution is probably to tell the servos where they should be immediately after attaching (or I think you can even call write() before attach())

14

Yes, you can write the default start position before the attach.

15

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