Antenna Tracking with HKGCS and 360 degree pan servo?

Hi Guys,

I have my antenna tracking set up with the Maestro board and have had no problem getting HKGCS to connect. The tilt servo works fine but I can't figure out how to stop the pan servo from rotating. It's a Hitec digital modified by Servo City for 360 degree rotation. Unfortunately, I can't set endpoints since it's a 360 degree servo and it rotates constantly. Anyone set up a servo like this for pan? Do I need to go back to a 180 degree servo?

Thanks for your help!

Jimmy

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Can you post a link to the servo you're using?

@Jimmy,
You cannot use a constant rotation servo in this case. You need a servo that can turn 360 degrees right or left, but no further. 3DR used to sell a Grand Wing 360 degree rotation servo and I have one. You might check out Grand Wing on-line.
Just a thought.
Regards,
TCIII

Paul,

The servo I was using is the HSR-5995TG converted to continuous (basically they removed the pot and put it outside the case).  I'll probably put the pot back in and program it for 180 degree.

Thanks TCIII.

What I wanted when I bought the servo was one that would go more than 180 degrees and need one that's pretty strong so it can support a Yagi antenna, if needed.  I think the Grand Wing servo isn't quite strong enough for what I need but will take a look at it.  

Really appreciate everyone's replies!

Jimmy

I'm not sure how that would work from a wiring perspective. If you're using it for a battery operated camera (so no wires) I see how that could work, but for tracking purposes, your wires are going to get all twisted.Plus the servo will lose track of where it is (I'm assuming). Doesn't it just keep spinning round and round or am I missing something?

Check out the Servo City or Robotshop.ca pan/tilt servo set ups. You can utilize a smaller indirect servo, with a pot on the axis, for the results in question.

Thanks Guys.  I'lll look at the ServoCity stuff.

Next problem - how to get the GCS to see a joystick...  I have a Logitech Extreme 3D Pro and a Logitech gamepad which are both properly installed but I can't get HKGCS to recognize either of them anan't find any instructions on how to make them work.  Any suggestions?

THanks!

Jimmy

output >1200 for movement, send <1000 for opposite movement, and dead center (had to find mine via experimentation)  for no movement... think of it as a non referenced stepper motor.

but for best performance like others have said, add an external pot but geared with ratios to match your needed movements.

I had the same issues with controling the 360 moded servo. I ended up using two servos.

 

one servo: with working motor, pot removed, and 360 mod. motor leads are fed externaly to the board from the first servo; and a small gear.

another servo: with no motor, but with the pot wired to the external board from the first servo; and a large gear.

 

The gears were just spools and belt from an old cd rom., it took awhile to get the right tension on the belt. not too tight but not too loose.

This worked very well, till i fried the little board from servo one. (didnt get one wire soldered quite right, and came loose and touched one of the components on it... well zap, that ones done.

edit: those pcb boards in the servos are really small and challanging to solder... lol  :)

@Jimmy,

I used the Grand Wing servo in a Lynxmotion turntable in place of the standard Hitec servo. I had to modify the servo mounting and turntable attachment point, but can support and turn a fair amount of weight.

Regards,

TCIII

Thanks TCIII!!!  Really appreciate your input!

Thanks Darren!  I'm going to use digital servos setup for 180 this weekend while deciding on which way to go,

Jimmy

That conversion turns a servo into a continuous-rotation drive. Basically, if you command left or right, the servo just keeps turning left or right forever, rather than stopping at any particular point.  They're used on the wheels of small differential drive robots, etc.

If you want the servo to stop at a particular angle, you will have to either reconnect the pot to the output shaft as you mention, or connect it to some other part of the mechanism. The latter can be helpful if, for example, you would like to add some gearing to the output shaft to make the servo stronger, or gearing to the pot to make it measure a wider sweep.

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