Open Bench Logic Sniffer

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Read about the Open Logic Sniffer hardware here.

Open Bench Logic Sniffer is an open source logic analyzer. It's designed to support the SUMP logic analyzer software at the lowest possible cost. This project is a collaboration between the Gadget Factory and Dangerous Prototypes.



Project Summary
Name: Open Bench Logic Sniffer
Buy it: Get one for $50 at Seeed Studio
Price: $50
Status: Mature
Manufacturing: Shipping
Forum: Open Bench Logic Sniffer Forum

Quick Start



Logic Analyzer Software


Logic analyzer client software controls the Logic Sniffer hardware and displays the pretty logic graph.

We recommend the multi-platform Java client actively developed by Jawi in the forum.

There are several other clients that support the SUMP protocol and work with the Logic Sniffer. They are in various stages of development.


This is a simple all-in-one solution that will guide you through the update process.

Latest versions:

  • PIC firmware v3.0
  • FPGA bitstream v3.07

The Logic Sniffer is a mature project, there are no known bugs in the firmware or bitstream.

For many, many alternate update utilities and tutorials, please see Various update applications for the Open Logic Sniffer.

In rare cases keyboards may stop working under Windows 7 after an update. This appears to be a Windows 7 problem. Here's a solution.




v3 Demon core in Verilog

This is the v3 core now in use. There are no known bugs.

v2 original SUMP VHDL core

PIC firmware


Test plans


  • The compiled firmware uses a USB PID licensed from Microchip for our use. It is limited to 10K units, and licensed only for our OLS hardware production, therefore we have to limit use of firmware compiled with these numbers to non-commercial use. You are free to compile the firmware from source without the PID and use it under the terms of the GPL.