You have the right idea, you just need to make the rectangle larger so that it doesn't leave a blank space behind it like you show.

The registration point of the rectangle shgould be centered at the top of it, and the rectangle should butt up to the arc above it as best you can.  If you make the registration point of the arc at the bottom center you can use the align tool to get them perfectly aligned.

I would not use a tween, though you could if you want to specify a frame number for whatever value you wish to represent.  Instead use code to vary the rotation property of the rectangle as I stated in my last posting.  That way you will have more flexibility for accuracy if that is necessary.

The registration marks of the rectangle is the axis where it will rotate.  You need to place that at the top center of the rectangle (third time)

Try using a classic tween instead of the new type.

To rotate with code you just assign the rectangle an instance name and change its rotation property, as in... rectName.rotation = 20;

A for loop loop processes instantaneously.  You would want to use a Timer or an ENTER_FRAME event handler to manage a gradual change.

stage.addEventListener(Event.ENTER_FRAME, adjustRotation);

function adjustRotation(evt:Event):void {

     if(donut.rotation <180) donut.rotation++;

}

I would think that if you intend to use this as a meter you would base the position of it on data and not just want to animate it for the sake of just showing it moving.

stage.addEventListener(Event.ENTER_FRAME, adjustRotation);

function adjustRotation(evt:Event):void {

     donut.rotation = some_meaningful_value;

}

There is no reason to have to use a donut shape for this.  The rectangle would do the same thing if the yellow area were  a mask.

The ENTER_FRAME event is dispatched at the frame rate of your swf file, so there should be no problem with it keeping up with anything. It is not a function.  The function that you assign to handle the event is where the work gets done as far as dealing with your meter.

The function that is handling the ENTER_FRAME event is executed at the frame rate of your file.  So if you used either of the version I showed ealier it would execute that function at the frame rate of your file.  If your frame rate is 24 fps, then the function will execute every 1/24 of a second (approximately).

When you remove the event listener, that is when the function will no longer be called.

THe reason the shape keeps rotating is because you are telling it to.  In the version I provide I put a condtion to stop it at 180 degrees, but for what you just showed there is no condition.

You will want to end up using the second version of what I offered earlier... you will need to replace the "some_meaningful_value" part of it with some value that is based on the value you want to show relative to the range of rotation you want the meter to have.

If you want the meter to display the watts for the generator then you would have the minimum to maximum wattage be represented as 0 to 180 degrees rotation for the meter.  If you were looking at a range 0 to 100 watts, then at 50 watts you would have the meter shape at 90 degrees rotation.

Just so you get a clearer understanding, the ENTER_FRAME event frame is not dispatched every frame, it is dispatched at the frame rate of your file.  You do not need to change frames for it to occur. They probably chose a bad name for it... some people take it literally and think it executes when you enter a frame.

You do not need to change frames at all for what you are doing.  You could control the visible property (true/false) of movieclips that display what you wish to have appear at different times.

You can store values into variables, including arrays, which you can use to store information from different stages if that is what you want.

Yes, the frame rate is frames per second, and when though of in terms of the ENTER_FRAME event, it  occurs at the same rate.

How often you log is up to you.  You could probably just keep a running average and not store any values.

If the page is a new stage, it is a new file.  Just create a movieclip or sprite symbol of the other content you want to display and make it visible or not when you need it showing or not.  You can also just place it on another frame instead of controlling its visibility.

You should learn more about creating with Flash while you are waiting for your sensors to arrive.

If you have no use for individual readings,  then keeping a running average would be all you need.  You could accomplish it by continually adding each reading to a total and then dividing by the number of readings.