Moving a servo to a safe state

12 years 9 months ago #22509837 by robotfire
Moving a servo to a safe state was created by robotfire
If I lose connection via RS232 or RC, my motors go to a safe state (center). Unfortunately, the safe state for the servo that controls the throttle goes to center as well. We want that servo to go to 0, so that the craft will stop moving. Any advice?<BR><BR>We are using an AX3500. Thanks!<BR><BR>EDIT: We also want the throttle NOT to go to 50% when the power is applied to the RoboteQ board. That's another problem we're dealing with.

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12 years 9 months ago #22528870 by cosma
Replied by cosma on topic Re:Moving a servo to a safe state
This capability is currently not available on the controller.

Firmware 1.9d brings a small improvement by stoppin the motors when in servo mode, when RC signal is lost. This makes the servo keep it's last position before signal loss.

If you are operating the controller in RC mode, you could use some of the "smarter" radio types which can be programmed to enter various user-defined safe modes upon signal loss.

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12 years 9 months ago #22530542 by robotfire
Replied by robotfire on topic Re:Moving a servo to a safe state
What about the throttle going to 50%? Is there a way to fix it so the throttle doesn't move when it starts up?

Thanks for your help!

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12 years 9 months ago #22534347 by cosma
Replied by cosma on topic Re:Moving a servo to a safe state
Normally the motors should not start in RC mode until a valid sigal is received.

In RS232 mode, the controller will try to move the motor to 50% position.

One work around is to play with the feedback potentiometer so that mechanical position 0 is when the potentiometer is at center.

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