Products > Crowd Funded Projects

Little Bee Current Probe

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--- Quote from: dougg on August 05, 2021, 01:42:40 am ---Received my Little Bee today and I'm trying to read the documentation. It is not obvious where the doco is in . My first guess was under the doc folder. When I navigated to the getting-started folder the rendered file had broken links in it. For example the first link is:
but should be:
Since all the links give blank images in my rendered , I guess they all have the same path problem.

Since you have a github account, you could take some extra steps and put up that documentation in html at (github has tutorials).
For example my repositories are at: and the associated html documentation is at: . I use LibreOffice Writer to generate (edit) html.

--- End quote ---

Sorry for not having this documentation up by the time the units shipped. I have a full set of operation instructions here now:  Please let me know if anything in the instructions can be improved.

I have been meaning to get some sort of website up for a while now. I also have registered. I ran into some issues last time I worked my way through the hosting, I will have to try again sometime.

--- Quote from: piotrekd on August 02, 2021, 09:01:37 pm ---Which ferrite core was used in the probe? What is the core material?
What do you think about the use of the HMC1021Z-RC in the project? Is available.

--- End quote ---

The core is 5943001301 (fair-rite type 43 material) with a 8.25mm cut. I modeled a few different things and tried a few different materials. Given the gap size the material is not that critical.

The HMC1021Z is much physically larger and has 1/3 the magnetic field range. It does have the advantage of availability though.

I am not sure how many units I am going to end up making in total, but for now I have the part sourcing under control. If I were to think long term I would focus on switching to a TMR magnetic sensor. They do not have the saturation issues that AMR sensors have.

Also, just a heads up for anyone who is interested, the Little Bee units are now available for general sale through Crowd Supply and Mouser. I think there is ~35 units still left from the initial batch of 200 units I made.

Hey Weston

Quick question, does the sensor get damaged if it experiences saturation? By saturation I mean being in an excessive magnetic field to the point of having to be reset (RED indication LED)

Right now I am trying to measure the rise time of a solenoid current waveform, this solenoid sees a peak current of 10A and looks like it's large enough to throw the sensor off

Cheers, Anton

hello, is there any 10A-100A version of your probe? 5A is way too small for me anyway


--- Quote from: technogeeky on July 02, 2021, 10:53:32 pm ---I got the notice today that the units have been shipped to Crowd Supply for distribution. I'm excited! I've wanted this kind of tool for a while!

--- End quote ---


Can you send pcb kits to Spain?. I have boutght a magnetic sensor, i have two HMC1041Z for this project.

I have tried to buy on your page and it says that it cannot send to Spain





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