how to make servo move only in negative degrees

:question: I think you’ve to define your question a little better. More background info about what you are trying to do. Do you use a BA/BAP+BB2 + SSC32? Is it a programming question?

Read… lynxmotion.com/images/html/servo01.htm

OK, what I think you’re asking is a basic scaling problem. Study this example taken from classic AH3 code: HipH_Pulse(Index) = (((HipH_PulseMax - HipH_PulseMin) * (HipH_Angle - HipH_AngleMin) | / (HipH_AngleMax - HipH_AngleMin) + HipH_PulseMin) max HipH_PulseMax) min HipH_Puls…

We still have very little information about HOW you are attempting to drive the servo. Is Labview communicating with an SSC-32? Is Labview generating an R/C servo PWM signal all by it’s self? An R/C servo generally requires a PWM signal that is one 500uS to 2500uS pulse width …

Are driving this with labview directly from a DAQ and no ssc-32? If you are then you need to put an oscilloscope on the PWM signal going to the servo and verify it is proper. There should be a positive pulse width between 1 milisecond and 2 milisecond in duration, 1.5 miliseco…

Eddie, With a DAQ? I’d think he’d use a digital output. It would be useful to know what Labview module he’s using. I wonder if he’s using the Lego stuff? What do they use? Alan KM6VV

I may over-generalize the term DAQ. We have different multi-I/O boards that get used with labview and just call them DAQs. They usually have digital i/o, analog i/o, and timer resources on them. Some use a PXI chassis and others are run from a USB port. I usually just get to …

Hay! Be nice to us Test Engineers! We have something like an NI SCXI chassis, with 1180,1182,1183 and 1104 boards in it. I’ve yet to write any code for it, or do much more then modify some of the test fixtures that we “plug in” via the Virginia panels. They are run with CVI, …

Hey you engineers be nice to us test developer floor roaches ok? :imp: :laughing: :stuck_out_tongue:

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Servo moving in negative direction

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mannat July 28, 2009, 5:42pm 5

hi
im moving knee motor with labview. …designing a force feedback controller…im sending a pwm signal…but the motor is not moving in negative direction

realtion between pwm signal and negative degrees(negative angle)…im using hs-645 MG

mannat