Thread: just another newbie question
01-19-2005, 05:42 AM #1imported_dutchGuest
just another newbie question
As in another thread discribed, I've modified some servo's getting a 270 degree turn (simply removing the stopping notch). If I turn the servo by hand, 270 degree rotation is possible, only the FS2Phidget software still shows a maximum of 180 degress in the calibration menu ? So how I can get my 270 degrees range to work ?
01-20-2005, 04:41 PM #2alandyerGuest
I will modify calibration page to allow greater range.
Will let you know when that version is available for download.
01-20-2005, 04:42 PM #3alandyerGuest
My apologies. Called you Dutch.
01-20-2005, 07:14 PM #4alandyerGuest
Download version 2.0.10 of FS2Phidgets.
Open INI file for servo with text editor such as Notepad.
File name will be something like PhidgetServo647.ini
Should be loacted in directory where you installed FS2Phidgets.
Usually, C:\Program Files\FS2Phidget\
Add the following entry for any servo you wish to have calibrated beyond the usual 180 degrees of travel.
ServoMax=240 <------- Add this line.
This is max value you want to see on calibration screen (the max rotation supported by your servo and the phidget card).
I have not tried this on a servo with rotational capabilities beyond 180 degrees.
You are now officially a test pilot
01-21-2005, 06:38 AM #5phidgetsGuestOriginally Posted by dutch
Alan asked me to ring in on the Phidgets capabilities for servo control. The Phidgets servo controller can accept values from -23 to 232 and that supports a pulse range from 0 microseconds to 2.7 microseconds. To know what your servo will respond to and what it's limits are you will need to refer to it's specs. How far a servo will turn is determined by it's properties not the signal we are sending to it. What I mean by that is, either a servo is made to achieve a certain degree of movement or it isn't. Our range of microsecond pulses that we can send far exceeds the signal specs on any servo.
The potentiometer inside the servo determines how much it can turn. You can't surpass the potentiometers limits of course. By removing the stop tab you might gain a few more degrees, but you run the risk of destroying the pot. If you remove the pot, then you have a continuous turn servo which will never know what it's own position is.
We are always open to hearing about servos out there that have large degrees of movement. If someone finds one that can do 270 - 360 I would stock it in a minute. But so far all my testing has come up dry for a good servo which moves more than 180
I hope this helps out
01-21-2005, 11:08 PM #6imported_dutchGuest
Thanks ! Will try this out this weekend...I'll let you know !
01-23-2005, 03:26 AM #7imported_dutchGuest
Thanks, Alan ! Would like to tell you, that you program update is working. Only have to remove the 180 degree limiter notch on the servo gear. Now the program shows 270 degress in calibration screen, also the servo is making 270 degree turns.
So my first analog oil pressure indicator is working now !
01-23-2005, 03:36 AM #8imported_dutchGuest
Just found out, if I saved my config, the Invert function will not being saved. Have to select Invert again, if I load the software new.
Is that known ?
01-23-2005, 08:17 AM #9phidgetsGuestOriginally Posted by dutch
Could you please tell us which servo you are using?
01-24-2005, 12:50 AM #10imported_dutchGuest
I'm using ProTech B-305 standard servo's....very cheap
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