---
title: Create Audio Notifications for Sensor Readings
slug: litmusedge/how-to-guides/flows-guides/create-audio-notifications-for-sensor-readings
description: You can create Flows to create dashboards for notifications. For example, a dashboard can notify you when sensor anomalies occur. 
docTags: 
createdAt: 2023-01-12T18:11:17.000Z
---

You can use Flows to create dashboards to notify you when sensor anomalies occur.

# User Scenario

Imagine a situation in an automobile assembly plant where temperature sensors detect readings that are beyond the normal range. In such a scenario, the system can immediately trigger an audio alert, which can help to quickly address potential issues. 

**To create a flow that notifies you of temperature reading alerts:**

1. In Litmus Edge, navigate to the **Flows Manager **and create a new flow. See [Create a Flow](docId\:wh4ZihWF0PwMRYRbAZbco) to learn more.
2. Drag an **Inject** node, **Function **node, and **Serial out** node onto the canvas and connect them.
3. Create a new connection by adding **Serial in**, **Function**, and **Audio out **nodes to the canvas and connecting them together.
   The *two connections* should be connected as shown below. 
   ![](https://api.archbee.com/api/optimize/SSUUxKZUk9bFTEPNn_6Zo/011yIOGsXZY095XaicBdv_image.png "Flows canvas")
4. Double-click either the **Serial in** or **Serial out **node.
   The *Edit serial node *dialog box appears. 
   - **Serial Port: **Click the **Edit **icon. 
     The *Edit serial-port node *page opens.
     - Create a configuration for the connected device. Make sure that the **Serial Port **and **Baud rate** match the device information.
     - Click **Update**.
   - Click **Done**.
5. Repeat **step 4** to configure each *serial* node in the flow.
6. Double-click the **Inject **node. 
   The *Edit inject node *dialog box appears.
   - **msg.payload**: Select **string **from the drop-down option and enter a string message that requests the desired data from it. 
     In this use case, *F* is used to request temperature data in Fahrenheit from the sensor. 
   - **Repeat:** Set an interval to have the node automatically request data after every one second.
   - Click **Done**.
     ::Image[]{src="https://api.archbee.com/api/optimize/SSUUxKZUk9bFTEPNn_6Zo/Y5W_AB5PZb0o9ZTrSaCcB_image.png" size="70" width="778" height="893" position="center" caption="Edit inject node dialog box" showCaption="true"}
7. Double-click the** Audio out** node. 
   The *Edit audio out node* dialog box appears.
   - **TTS Voice**: Select a voice to use. 
   - **Play audio when window not in focus:** Select the check box to hear the alert when the flow is minimized.
   - **Group:** If needed, click the **Edit **icon to create a dashboard.
   - **Name: **Enter a user-defined** name.** 
   - Click **Done**.
     ::Image[]{src="https://api.archbee.com/api/optimize/SSUUxKZUk9bFTEPNn_6Zo/AD64zUX-fM6FXfYFk0Mjq_image.png" size="70" width="800" height="442" position="center" caption="Edit audio out node dialog box" showCaption="true"}
8. Double-click the **Function **node connected to the *Inject* node and *Serial out* node.
   The *Edit function node* dialog box appears. 
   - **On Message:** Enter code that adds a carriage return to the message to ensure that the device reads it properly.
     `msg.payload = msg.payload + "\r"; // Add a carriage return to the output.
     `
     `return msg;`
9. Double-click the **Function **node connected to the *Serial in* node and *Audio out* node.
   The *Edit function node* dialog box appears. 
   - **On Message: **Enter code that checks for the sensor reading and outputs a message when it is above or below a certain threshold.
     `var val = parseFloat(msg.payload); // Gets the temperature in degrees Fahrenheit from the string sent by the device.
     `
     `if (val > 70.0) { // Checks for if the temperature is higher than 70 deg F
     `
     `msg.payload = "high"; // Sets the notification message to say "high" when the temperature is high.
     `
     `}
     `
     `else {
     `
     `msg.payload = "low"; // Sets the notification message to say "low" when the temperature is lower than 70 deg F.
     `
     `}
     `
     `return msg;`
10. Click **Deploy **and expand the message window beneath the flow.
11. Click the **Dashboard **icon. Then, click the **Expand** icon to open the dashboard to begin hearing the audio notifications.
    ![](https://api.archbee.com/api/optimize/SSUUxKZUk9bFTEPNn_6Zo/BeQ1CtJSD6J_q5oBgXs7J_image.png "The expanded dashboard icon")