Tried and gave up

A project log for Peek inside UNI-T UT390B+

Much cleverer people hacked the orginal UT390B laser range finder but no-one seems to have published what we know about the UT390+.

StefanMStefanM 11/20/2016 at 18:046 Comments

I tried to get some data out of a KKMOON branded laser range meter.

It's inside is from SNDWAY and looks basicly like the UNI-T UT390B+. Moreover there were some debug pads inside wired to RX and TX but they were dead.

First I did some measurements on different pins, like Simon did, but finally I gave up since it was too time consuming.

Now I have orded some other device beeing supposed to have an active RS232 port. So I will keep you informed if I have any news.

Moreover I attached the information I could find out about the pinning - it's written in German. Unfortunately I couldn't upload the pdf file.


Mictronics wrote 02/24/2018 at 17:56 point

Reading the distance from the above shown laser distance meter works now with an Arduino Mini.

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Simon Merrett wrote 02/25/2018 at 08:23 point

Excellent work! Thanks. Would you mind me adding the link to the project description/details? Or would you prefer if we wait for the "more to come" that your blog promises? 

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Mictronics wrote 02/25/2018 at 09:10 point

Go ahead, add it. I will keep the blog post up to date with my work.

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Mictronics wrote 02/17/2018 at 12:20 point

I'm trying to hack the above mentioned meter. See

Found what look like an SPI bus on a missing chip footprint. Any help appreciated.

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Simon Merrett wrote 02/25/2018 at 08:23 point

Sorry, didn't get an alert for this comment. Replied above though. 

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Simon Merrett wrote 11/25/2016 at 10:54 point

Stefan, I've only just seen your post - wow! Thanks for sharing. It's disappointing that these are less easy to hack than we'd hoped but I'm sure that people will find a way and it will all become a lot faster if we build off each other's discoveries. It's demoralising when we hit hurdles and walls but keep up the good work!

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