This guide assumes familiarity with:
CommandNode (Sending a Device Command)
Utterance ParameterNode (Sending a Device Command With an Argument)
AttributeNode (Create a Bixby Response Using a Device Status)
In this guide, you'll learn how to perform an arithmetic operation of addition using a
Sum Node in an action flow. You can use a
Sum Node to increase the attribute value of a device, such as volume or brightness level, by a specific integer within a specified range. And while this guide highlights the addition operation, you can also use other arithmetic operations in Bixby Home Studio (BHS).
This guide uses the example "Increase the volume of the television by 10" to increase the volume of the television by a value stated in a user's voice command.
volume - increaseVoice Intent
The goal is to define the action flow for the
volume-increase voice intent for the device.
For this voice intent, the user is expected to give Bixby an integer value between 0 and 100 in the voice command.
Example: "Increase the volume of the television by 10."
In BHS, you can configure the
Utterance Parameter Node with a default value. Normally, a device would get the input value from a user's utterance. For testing purposes in this guide, use a default value, which allows you to test the action flow on a device without an actual user utterance.
First, start building your action flow. Drag the
Utterance Parameter Nodes from the action flow nodes sidebar to the editor area. Then, configure the
Utterance Parameter Node:
Utterance ParameterNode. This opens the Node Configuration menu on the right of the editor area.
defaultValuefield. For this example, enter 10.
Now the default value of 10 is set for the
Utterance Parameter Node. In a real use case, you need to fetch the volume value from a user's utterance.
Now, you need to add and configure an
Attribute Node, to fetch the current volume value of the device.
The current volume value of the device is an attribute of the audioVolume capability.
To add and configure this node:
Attribute Node from the action flow nodes sidebar to the editor area. Select the node. This opens the Node Configuration menu on the right of the editor area.
audioVolume capability. In most cases, you can leave the component selection as the default option,
main. For more information on components, see the note at the bottom of this section.
In the pop-up, select the value property for the
audioVolume attribute. Click SAVE.
The Node Configuration window will look like this:
Most devices have only one operating section or compartment. In this case, the only option for component is main. If a device has many sections or compartments that you can operate independently, there will be multiple component options, such as
Now you're ready to add a
Sum Node to the action flow.
Sum Node from the action flow nodes sidebar to the editor area.
The values of the
Utterance Parameter Node and the
Attribute Node get passed to a
Sum Node, whose output sets the final
audioVolume of the device.
Sum Node has two input data ports (
rightValue), and one output data port. The output port returns the result of adding the
Next, you need to add a
Command Node to the action flow to set the device's
Finally, add a
Command Node. The output value of the
Sum Node will be the argument for the
Command Node. Configure the
Command Node to tell the device to set its
audioVolume to the argument value:
Command Node to the flow editor area. Then, click the node to open the Node Configuration menu on the right. Click APPEND NEW ITEM.
Select main in the component drop-down menu. Then, select audioVolume in the capability drop-down menu.
A pop-up for the
audioVolume capability opens. Select the setVolume command. Click SAVE.
Command Node should now have a dynamic input port for the
audioVolume value. The input value determines the volume value for this device.
Now you need to connect a data path from the
Sum Node's value data port to the
Command Node's dynamic input port. You also need to connect the
Start Node's main port to the
Sum Node's trigger port and the
Sum Node's main port to the
Command Node's trigger port.
Here's the finished action flow:
To test the action flow, click the Try It button at the top right of the editor window. The flow editor should look like this:
As you can see above, the current
audioVolume value is 21, and the user's utterance value is 10. These two values are fed into the
Sum Node, which gives the result of 31. This value is sent to the device using the
Command Node to set the
audioVolume to 31.
You can use any of these arithmetic operations in action flows:
You can also perform calculations with the Sub Graph feature to reduce the complexity of a graph and separate functionality into distinctive and reusable sections.
For an additional example, see the "Increase the Brightness of the Device by a Value" Sample Graph.