Hi all ... have a little problem with a servo i modified for continous rotation
#include <Servo.h>
Servo myservo; // create servo object to control a servo
void setup()
{
myservo.attach(9); // attaches the servo on pin 9 to the servo object
}
void loop()
{
myservo.write(0); // rotate counterclockwise
delay(5000);
myservo.write(90); // stop
delay(2000);
myservo.write(180); // rotate clockwise
delay(2000);
}
will rotate counterclockwise for command myservo.write(0); ...
rotates clockwise and then stops for command myservo.write(0); (uaually in a different position every time program loops)
dose not rotate continually for command myservo.write(180); just rotates to a position (usually a different one every time program loops) and then stops
have tried different values up to 1024 but cannot get it to rotate continually clockwise
to modify servo just had to remove a bit of plastic ..
took another servo apart and ran that one and could see pot turning ... on (0) pot turned full and motor continues running on (180) pot turned full other way then motor stops .
managed to break a wire on pot and and saw motor tuning full on (180) but as this was a accident i didnt see which wire it was and then other two wires fell of LoL
so wondering how do i get this servo to rotate continually on (180) or do i need to cut one of the pot wires ... if so any suggestions to which one i cut
cutting might not be best solution as i just realised did not stop between rotating clockwise and counterclockwise
https://www.youtube.com/watch?v=IgSfMa8IlxM
thanks guys will try these
thanks guys will try these out and hopefully get one to work …
ok managed to get this to
ok managed to get this to work reasonably ok … decided against the resistors as there is so little room in servo case … would have being to messy … went with soldering the pot and filing the shaft … centered the pot and soldered but pot must have moved a bit during soldering as when code in myservo.write(90); it moves slowly … using myservo.write(92) instead and it stays stopped 90% of the time
so myservo.write(0) i get counterclockwise continuous … myservo.write(180) gets clockwise continuous and myservo.write(92) stops (well mostly)
will probably give it ago again on anothe one and see can i improve now that i know what im doing … but thanks for the help
have u put resistors in
if so, what’s the volume did you put into the servo instead the potentiometer
That’s pretty normal. It is
That’s pretty normal. It is nearly impossible to get the center stop position fixed reliably. In fact resistance values float a bit with temperatures, etc.
What I tend to do when I want my continuous rotation servos to stop is to disable the servo entirely by detaching it.
myservo.attach(9);
Then you can attach it again when you want to use it.
This works fine unless you need the server to stay fixed in the stop position. When you detach it, it will will not be powered, so you can turn it freely, except for the servo’s internal friction.
The replacement resistors
I measured the potentiometer in a small 9g servo the other day and it was 3K ohms. So i used two 1.5K ohm 1/16 Watt thru hole resisters attached to the wires cut from the potentiometer. After clipping the pins from the potentiometer and trimming the leads real short i was able to squeeze them into the case.
But next time i will use surface mount resisters. I think anything from 1.2 to 2K should be fine.
RG
