I want to use a coil printed on a pcb like a proximity sensor for a moving
piece of metal that gives analog values to the arduino. What would be the schematic for doing so?
The problem with a PCB coil is that you can't have many turns so it has low inductance. The "moving bit of metal" will therefore only make changes that can be detected using a rather high frequency signal which makes the job more complicated. Why do you want to print the coil, is it just for convenience or low cost? How big is the piece of metal and how far away do you want to detect it? There are many standard inductors available that might be used if your requirements are better defined.
How about you provide your schematic and along with it your specifications for exactly what you need or want. People will help you and guide you. You have not provided any useable information like an objective for example?
Ron
Is it an asteroid? a bullet? it would help to know the velocities, masses and nature - characteristics of your project.
Why not test your project by making a flat coil of insulated solid copper wire the size of your printed coil?
5 full windings and you are in the 100 MHz resonance range...
Can be done...
a tiny spring that compress and releases
that's the result i want to achieve
OK so this is what you are looking at. This is a development kit not ready yet for prime time. They do mention ...:
We are still working on the software side of this development kit. Not only do we need to output the analog data to your computer, we also need to remove noise. One of the cool features we would love to talk about more is our filtering algorithm for EMI (electro magnetic interference). To be continued ...
They are measuring inductance, the closer to the coil a piece of metal comes (metal in the switch) the inductance changes and is measured. You can start with a Google of "Measure Inductance Arduino" and work from there. Your board will need to be designed as you see in the video. None of this is easy and you start with understanding inductors to variable inductors and how they work. There is quite a bit of math involved. Get familiar with inductive pressure sensors and how they work.
The link is merely a proof of concept and I have no idea what is to be realized from it.
Ron
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