> For the complete documentation index, see [llms.txt](https://docs.intrepidcs.com/vspy-3-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.intrepidcs.com/vspy-3-documentation/3.9.11/shared-features-in-vehicle-spy/shared-features-calculated-signal-editor/shared-features-calculated-analog-or-digital-signals.md). # Shared Features: Calculated Analog or Digital Signals An [Application Signal](/vspy-3-documentation/3.9.11/vehicle-spy-main-menus/main-menu-scripting-and-automation/application-signals.md) or a [Tx Panel signal](/vspy-3-documentation/3.9.11/vehicle-spy-main-menus/main-menu-spy-networks/transmit-panel/dynamic-transmit-message-bytes.md) can have a numeric value which can be interpreted as an analog or digital [Signal Type](/vspy-3-documentation/3.9.11/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-signals/message-signal-type.md). There are many different ways a signal can be calculated. The different calculations are created with the [Setup Calculated Signal](/vspy-3-documentation/3.9.11/shared-features-in-vehicle-spy/shared-features-calculated-signal-editor.md) screen. The descriptions for the different options are listed in Table 1 below.\ \ If a signal property has an equation button (![](https://cdn.intrepidcs.net/support/VehicleSpy/assets/spyEQ.gif)) next to it, you can enter an [equation](/vspy-3-documentation/3.9.11/shared-features-in-vehicle-spy/shared-features-expression-builder.md) for the signal instead of a static value. This will let you modify signals based on other Vehicle Spy data. For example, you could use a knob to change the frequency of a sine wave. **Table 1: Listing of Numeric Calculated Signal Types**
Calculated Signal TypeDescription

Random Data
Properties: Min, Max


This signal calculates a random value between the Min and Max properties.

Sinusoidal Wave
Properties: Min, Max, Frequency, Phase

This signal creates a sine wave between the Min and Max value with the specified frequency. It will also delay the waveform in relation to others using the Phase parameter.

Ramp Properties: Min, Max, Frequency, Phase

This signal creates a ramp wave between the Min and Max value with the specified frequency. It will also delay the waveform in relation to others using the Phase parameter.

Triangle
Properties: Min, Max, Frequency, Phase

This signal creates a Triangle wave between the Min and Max value with the specified frequency. It will also delay the waveform in relation to others using the Phase parameter.

Square
Properties: Min, Max, Frequency, Phase, Duty Cycle

This signal creates a square wave between the Min and Max value with the specified frequency and duty cycle. It will also delay the waveform in relation to others using the Phase parameter.

Custom List
Properties: List of Points

This calculation will replay a list of values into the signal. After it replays the list it will start over at the first list item.

Equation Based
Properties: Min, Max, Equation

This calculation will use an Expression Builder equation to update a signal. The Min and Max properties are optional. Leave them blank if you do not want to use them. If not blank, a Min and/or Max limit will be applied to the result.

Static Value
Properties: Value

This calculation will use the static value entered in the value entry.

Remote Signal
Properties: Remote Server, Application Signal

This calculation will use an application signal value from another instance of Vehicle Spy on a network. The parameters for this type of application signal are the Remote server to connect to and the application signal to read in. The Update List button will repopulate the dropdown lists.
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