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Why do servo motors rotate itself ?

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bianchi77

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Guys,

Why do those servo motors rotate itself, when the first time I apply power supply, I haven't sent signal yet,
What should I do to prevent it ? any ideas ?

Thanks
 

Try to keep the control signal low during the power up. If this is not helping - change the servo motor (try different manufacturer).
 

luben111 said:
Try to keep the control signal low during the power up. If this is not helping - change the servo motor (try different manufacturer).
Click to expand...

on the start I put like this ?
Code: 
void main()
{
unsigned char serial_char;
	int i;
	TMOD=0x20; 		// Mode2
	TH1= -23;		// 50usec timer
	
	output=0;
	output1=0;
	output2=0;
	output3=0;
	output4=0;

- - - Updated - - -

luben111 said:
Try to keep the control signal low during the power up. If this is not helping - change the servo motor (try different manufacturer).
Click to expand...
I must plug out the signal first, then the servo will not rotate itself, any solution for it ? how to ground the servo signal when startup ?

- - - Updated - - -

I use ULN2003 as a driver, is there something I can do to fix it ?
 

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