Open Bench Logic Sniffer/es

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Ols-cover es.jpg

Read about the Open Logic Sniffer hardware here.

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



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






There is now a Gadgetfactory complete update package.
This is a simple all-in-one solution for updating.
Software overview / Latest stable release
Item Website/Documentation Latest stable release - download link
Boot loader n/a
PIC firmware Forum thread
FPGA 'Demon' Core Forum thread
PC client, Jawi ols-0.9.5-full.tar.gz
Original PIC fw_update (Windows/Linux/Mac) Forum thread
Original FPGA/ROM ols-loader (Windows/Linux/Mac) OLS-loader utility Forum thread
Combined PIC/FPGA update tool (Windows/Linux/Mac?) OLS-fwloader comprehensive update utility ols-fwloader-0.1.tar.gz
Windows GUI combined PIC/FPGA update tool Source on github

For details about the features see the Feature Status page.

How to update

Complete upgrades

FPGA bitstream upgrades

PIC firmware upgrades

Some preorder 1 Logic Sniffers shipped without a bootloader. Here's some options to get it fixed:bootloader rescue

Logic Analyzer Software

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

SUMP fork


We recommend this SUMP client.

Multi-platform Java client. A version of the SUMP client actively developed by Jawi in the forum.

Other SUMP-compatible clients

The original software for the SUMP core used in the Logic Sniffer is a multi-platform Java application.

There are several other clients that support the SUMP protocol. They are in various stages of development.


New v3 Demon core in Verilog

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.