Can I carry DIY electronics to a plane?

I am an electronics engineer and electronics enthusiast with the desire to monitor different parameters at different times.
I've created a small X-Y-Z planes accelerometer, which I would like to take to the airplane to measure accelerations during takeoff and landing.
May I have any kind of problems carrying this item on the plane, for which I will add a switch and a 9V battery?
What are actual regulations about DIY electronics? I know you can carry a laptop, tablet, phone, camera, etc., but DIY?
PS: Would it make easier to carry if I'd put it into a 3D-printed case?
PS2: I forgot to mention it, I'm flying inside the EU with Ryanair and Easyjet.
Best Answer
There aren't any regulations I know of specifically covering bringing DIY electronics (it would be a weird thing to make a regulation about). I've carried them many times, and only had something inspected once: They swabbed it with an explosive detection swab, waited for the beep, and let me go on my way.
Actually using such a thing on a plane may be different. I'm gonna go waaaay out on a limb and guess that you haven't subjected that thing to EMF testing.
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Can electronics be carried on plane?
Electronics. Personal electronics are allowed in either checked or carry-on luggage. In fact, it might be preferable for you to keep items such as laptops, MP3 players, video cameras and video game systems with you, because checked baggage might be jostled quite a bit as it's loaded onto and off the plane.How do I pack electronics at the airport?
Pack large electronics on top layer of carry-on for screening accessibility. Place your 3-1-1 bag with liquids, gels and aerosols in the front pocket of your carry-on for accessibility.Does TSA make you take out electronics?
According to the TSA, only electronics larger than a cell phone must be removed from their carrying cases and X-rayed separately. This does include laptops and tablets, but it doesn't include phones, electric toothbrushes, or hair dryers. TSA PreCheck members don't have to remove electronics for separate screening.Problems with Camera Gear and Airport SECURITY
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Answer 2
You will definitely not be allowed to use your custom device on your Easyjet flight. They list what can be used, and specifically say that devices without a "Flight Safe" mode must be switched off.
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