This release contains several fixes. We recommend updating immediately, especially if you use the UTC wall-clock feature or record JLS files. As usual, you should be prompted to update the Joulescope UI at launch whenever a new release is available. You can also manually download and install.

The most significant issue fixed by this update is the JS220 UTC wall-clock time alignment, which is fixed by the included JS220 FPGA image 1.3.2.

Before this fix, a JS220 may become unaligned with UTC wall-clock time, with an error of about 35 minutes in the past. JLS files may have reported a shorter duration than expected. However, the integrated quantities of charge and energy were still correct despite the incorrect UTC.  

The issue was relatively infrequent but reproducible within days on some host computers. Unfortunately, this issue is old and has affected the JS220 since we added on-instrument time alignment a year ago. For details, please take a look at issue #296. This issue did not affect the JS110.

If you have any questions about how this may have affected your measurements, please post questions to this forum topic or contact support@joulescope.com.

The IoT Show

Matt Liberty was recently a guest on The IoT Show hosted by Olivier Bloch. We discussed using Joulescopes to build better IoT products with a demo of a Golioth development board.

Stream the episode on YouTube:

uUSB Front Panel

Heath Raftery created a new open-source JS220 front panel with all of the USB connectors:

The front panel is for sale on Tindie, but it is all sold out at the moment. You can find the discussion on the forum and the design files on GitHub.

Vertical JS220 Stand

We designed Joulescopes to be compact and portable. We know that bench space and desk space can be limited.

Zak Fields at Blues noticed that he could save even more space by mounting the Joulescope JS220 vertically. He designed this 3D printed stand:

Zak released the design on TinkerCAD using the Creative Commons 3 license.

We printed one in black. It works great, and it looks great:

Download and print yours today!

New Distributor in India

We proudly announce that GSAS Micro Systems Private Limited is now an authorized Joulescope distributor.

Located in India and considering purchasing Joulescopes? Avoid import hassles by ordering from GSAS Micro Systems!

Joulescope Year in Review

We have been busy over the past year! Over the course of 2024, we:

• Helped our customers build industry-leading low-power products

• Launched two products: JS220+ and JS220 Safety Banana Jack Front Panel

• Exhibited at Embedded World, Embedded World NA, and PCB Carolina

• Added features to improve all Joulescopes: triggers, translations, plugins, JS220 on-instrument downsampling, node.js support

• Improved manufacturing processes to maintain price despite inflation

• Provided free, highly responsive customer support through forum & email

• Contributed 289 commits to our open-source software

Here is a snapshot of the commits to the pyjoulescope_ui GitHub repo for 2024:

We remain dedicated to simplifying low-power design, and we have some exciting plans for 2025 and beyond!

Curious about whether a Joulescope is the perfect fit for your needs or have questions about its functionalities? We're here to help! Reply to this email, contact us directly, or join the conversation on the Joulescope forum!