Servo problem: only 1 direction

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1

Another noobquestion here :)

We have a servo modified for continuous rotation and when we get the 5V power from the PICAXE 28X1 it works just fine, but when we attach the red and black wire directly to a 9V battery it turns only one direction (Clockwise). It seems it's not making a difference between clockwise and counterclockwise :(

This is the code:

main:
servo 0,75
servo 7,75 =for the servo bug :(
pause 1000
low 0
pause 1000
servo 0,225
pause 1000
low 0
pause 1000
goto main

The servo stops exactly when it has to but it turns only one direction :( Somebody knows what could be the problem? It works fine on the 5V but not on 9V...

We want to use the separate 9V because we don't want to burn something (we're poor students :D). We are going to use 3 servos total; 2 modified for moving the robot, and 1 with a Sharp IR mounted on it. Is it safe to use them together without risking to burn something? Cause then we have no problem :P The servo's are S3003's BTW

Thanks in advance,

Stef

2

If you don’t want to burn

If you don’t want to burn anything, why are you feeding 9V to your servos? Servos are normally rated for 6V or some for 7.2V. Also, a standard 9V battery doesn’t have much power. Use a separate 6V source.

 

3

What you need is called an

What you need is called an H-bridge. http://en.wikipedia.org/wiki/H-bridge

Use 2 outputs on your chip for each motor and you can change the direction.

4

Not for modified servos.
Not for modified servos. They are built into the servos already.