Re: How do the servos work?
 

Do you have a good 7.2v battery connected? The servos won't work without one.

Re: How do the servos work?
 

Phil,
I just have to ask, is the 7.2 volt backup battery connected? Without it you have no power to the servo. Just a little "gotcha" from Innovation First. When nothing works, check the power supply.

Re: How do the servos work?
 

Yes. Good 7.2 volt Battery on the Robot, Good 12v as well.
I think I found the problem last night when working on Yaw Sensing.
I think I need to Generate_PWMS()

Servo is in PWM1, Yaw was in PWM2, got the Yaw Sensor to work didn't have time to try the Servo again.

Question.
Do you need to call Generate_PWMS() for each and every PWM you are using or just the Top 4, (13,14,15,16)

Thanks,

Phil

Re: How do the servos work?
 

Phil,
I don't have an answer on software, I will alert my software gurus and let him or her answer.

Re: How do the servos work?
 

I can answer now. :)

You only need to call Generate_PWMs() for the top four. The others are handled by the master processor.

Re: How do the servos work?
 

Phil,
Generate_PWMS() is only used for the top 4. The putdata() call updates the other PWM outputs via the master processor.

Re: How do the servos work?
 

Our team is also having problems with the servos. I could be wrong, but aren't servos supposed to resist turning by some outside force when they have power? We have tried several servos on several pwm's and you can easily turn them all with your hand. None of them move at all. I have tried mapping joystick outputs to the servos and tried moving them autonomously. Nothing works.

Re: How do the servos work?
 

We were (somehow) missing the putdata :(
All better now. Our 7.2 battery was not plugged in. Servos working like a charm now.
Yaw sensor not allowed as not in Kit 'o parts.
If we buy a gyro we can :)

Thanks for all the help.

Phil

Re: How do the servos work?
 

I have tried to get the servo working.

Our code is set up so when i plug in pwms for motors they run. i inserted the servo code as a motor. pwm03 is the servo:

pwm03 = 200;


the servo is plugged in to the output 3 but does not move. i read the forums, and i see that they only run off the backup battery. is this true?

Re: How do the servos work?
 

Yes. That information is also on page 4 of the RC reference guide from Innovation First.

Re: How do the servos work?
 

Yes,
A little gift from Innovation FIRST is that the servo power is only from the backup battery (7.2 volts) If you are going to tuse servo make sure you have some way to check the battery and keep it charged.