90 degrees in 10 Seconds

I just bought the Maestro 6 and a servo Hitec HS-82MG. I want to accomplish that the servo arm is making a rotation of 90° in a timespan of 10 seconds and repeat this action all the time, till the power is switch off.
How I tried to accomplish this was by setting the speed on 1, The advanced pulse control: Period 1, and the Frame duration for both frames on 38000.
I am not sure that this is the correct way to accomplish this… because the arm is not always going up to the end or start points.
Can some help me as a novice what I should do? (I am not into electronics but I need this setup for a photography project)

Hello.

I suspect you can get close to the speed you want by using only a speed limit and not changing any of the advanced pulse settings. The speed setting is in units of 0.25μs per 10ms, so you can use the following equation to calculate the speed setting based on the pulse width range, Δpw (in units of μs), and the amount of time you want it to take, Δt (in ms):

\text{SPEED} = \frac{\text{Δpw} }{ \frac{0.25μs}{10ms}\text{Δt}}

Please note that this equation is only true when the advanced pulse width settings are at their default values. I looked briefly and couldn’t find specs for the Hitec HS-82MG that list how far it travels for a given pulse width range, but it looks like ServoCity claims it will travel 92° with an “average radio system”, which I suspect is between the 1000μs to 2000μs pulse range. If that’s the case, using a Δpw of 1000μs and a Δt of 10000ms, a speed value of 4 might work for you (with the Period and Period multiplier settings at their default values of 20 and 1, respectively).

By the way, the “Duration” of a frame in the sequencer just adjusts the time the Maestro will wait before calling the next frame in your sequence; it does not affect the motion profile of the servo. So, since your servo will take 10 seconds to get to its position, you will want to set it to at least 10000 (to make sure it gets all the way to its target) plus however long you want it to pause after it gets there.

Brandon

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