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Read Meter (G Dataflow)

Last Modified: June 25, 2019

Reads the position of the needle using the base of the needle and the array of the points of the arc traced by the tip of the needle.

This node reads meters with a dark needle on a light background or with a light needle on a dark background. It returns the location of the tip of the needle as a percentage of the full range of the meter.

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dark/light needle?

Boolean that controls the color of the needle.

TRUE Light needle on a dark background.
FALSE Dark needle on a light background.

Default: FALSE

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image in

Reference to the source image.

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needle base

Cluster containing the coordinates of the base of the needle.

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arc points

Array of clusters containing the coordinates of the points of the arc traced by the tip of the needle.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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percentage of scale

Angle of the needle as a percentage of the full-scale angle.

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needle tip point

Cluster that specifies the coordinates of the needle tip.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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