Saleae FFT

An analog measurement extension for Saleae Logic that computes the FFT of a selected analog signal range, reports the fundamental frequency as an in-app measurement, and sends selected data to an interactive FFT window.

Features

• Saleae Extension — fundamental frequency is displayed in the Logic 2 measurements window.
• FFT Plot Viewer — a separate matplotlib/tkinter GUI window showing the full FFT plot.

Requirements

• Saleae Logic 2 (version 2.4.0+)
• Python 3.8+
• matplotlib (for the FFT plot viewer)
• scipy (for peak detection in the FFT plot viewer)
• numpy

Install the required packages:

pip install -r requirements.txt

Install Extension

1. Open Saleae Logic 2.
2. Navigate to Extensions - Load Existing Extension
3. Select the folder containing this plugin.
4. The Saleae FFT plugin will appear in the measurement extensions list.

Usage

1. Run fft_plot_gui.py or .exe
2. Capture an analog signal in Logic 2.
3. Open the Measurements sidebar and add the Saleae FFT Plugin measurement.
4. Select a region of analog data on your channel.
5. The fundamental frequency value appears in the measurement results.

Note: Disable this extension while not using the GUI, as the resource-intensive FFT calculation runs on any analog waveform selection.