# How to obtain the FFT data By default, the FFT data is turned off on the NEON vibration sensor. To activate the FFT a configuration downlink must be generated and sent via LoRa. Please refer to the [configuration ](/docs/configuration/online-configurator.md)section for guidance on how to configure a NEON sensor. The settings to turn on the FFT in the NEON vibration sensor are explained next. To activate the FFT at least one of the three options in **Calculation Trigger** in the **Sensor Data** tab must be set to **Yes**.

Calculation Trigger available options

### **On Event** On Event means that an FFT will be calculated and transmitted with every event message. These are the messages triggered by periodicity and threshold triggers. Along with enabling FFT on events, the user must set a value higher to 0 in the field **Calculation Interval**.

Calculation Interval setting

The periodicity of the FFT depends on the **Calculation Interval** and the **Measurement Interval Minutes** defined on the sensor configuration. Multiplying these values will indicate how often the device will calculate an FFT. ### **On Threshold** On Threshold is to be used alongside the **Trigger Thresholds** section in the sensor data configuration. Up to five triggers can be defined that will trigger an FFT. The user must select between velocity and acceleration, the frequency, and the magnitude of the trigger.

Example of a Trigger Threshold setting

### **On Button Press** Pressing the button of the NEON vibration sensor will trigger an FFT. {% hint style="danger" %} **Limitation**: due to the dwell time, NEON Vibration Sensors using the communication protocol V3 and operating on US915 won't be able to transmit an FFT message if the spreading factor is SF10 or higher. Improve the network quality to use all the functionalities of the device. {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.twtg.io/docs/how-to/vibration-sensor-vb/communication-protocol-v2-and-v3/how-to-obtain-the-fft-data.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.