dCompass availability



First off, let me create some context to this request - I work in a university physics department and we run a programming mini-project aimed at teaching first-year undergraduates about hardware/software interfaces and a basic introduction to electronic control systems. We teach our undergraduates python as a first programming language, so as you may have guessed, we use RaspberryPi/BrickPi for this project. It’s really popular and the students (and staff!) have a lot of fun, but we try and encourage them to develop something that has a physics focus. We have one of the Lego magnetic sensors, but it seems pretty unreliable, so I was delighted to come across the dCompass which uses the same Honeywell sensor we use in our research labs for active magnetic field compensation at the milli-Gauss level, which should easily be sensitive enough for a little magnetic-field sensing experiment. Unfortunately this doesn’t seem to be on sale any more? Is there a technical reason for this, or just a business decision?

A couple of requests then - (assuming there were no technical reasons why you stopped selling them) is there any chance you could make the PCB schematics and firmware available (either privately or publicly) so we can get a couple made? Or, being slightly cheeky, do you have any old stock left that you could donate for educational purposes?

Keep up the great work

Best regards



Hey jamesk86, I’m really sorry! We discontinued this product a few years ago. I am happy to send along the design files and BOM of everything. Ok if I put it up on Github? You’re free to do with it as you like. Unfortunately we are fully clean out of stock on this one.


Hi John

That would be great, thank you! GitHub is fine - I’ll keep a look out! If you want, I can fork everything and keep you updated if I make any changes?




Hey James, sorry to take so long. I just put the design and the BOM up there. You can find them here:




Specifically here: https://github.com/DexterInd/DI_LEGO_NXT/tree/master/dCompass


if you are still looking for the dCompass sensor, I have one for sale perfectly working (I have also a dIMU if you want it)