dear all,
what do you suggest for the sensor to measure the thickness of material that obtains the result in milimetre order? I want to create the simple project with Arduino for measuring the resistivity of object which the thickness of material does matter,
Thank you so much
Welcome.
It would be 100,000 times easier to answer this if you told us what the mysterious material is.
Please read
Hi, sorry for not obtaining what material is. The sample material that is being used is Silicon wafer. However, it might be use for another type of material (metal, etc). Since the resistivity measurement method that I use is four point probe (and its common for semiconductor). Thank you
Where will the wafer be located when you measure it? I suppose you can imagine, there is no sensor that can measure thickness directly, instead there is only the distance between sides of the object.
So you have to provide a lot more detail about the test environment. I think you read the forum guide too quickly. Take some time to absorb it.
We can't see what you see, don't know what you know... try to imagine reading your question under those conditions, as if someone else had asked.
Will this be a one time measurement, or a repetitive process that will have a test fixture for example, and process dozens or thousands of samples? If so, will it be loaded manually or robotically?
What did Google find for you? Did you try submitting the thread title to it?
Machine screws have a known pitch (for example, 0.8mm for a common screw) so use #6 times thread pitch.
Nice but, where is the Arduino? 
Turns the stepper and does the counting.
The software is easy. The electronics is even easier. Do you have the physical construction done?
US$20
My late company used to build such devices for a customer, until he ran out of cast aluminum enclosures and hinged lids. Then we repaired the devices shipped for repairs from universities all around the world.
Your biggest challenge will be to apply consistent pressure to the 4 points, not making a stepper motor turn a screw.
Can you describe or show the four points?
We don't really know if four points are needed, until we get some feedback from the OP.
Way too long ago, but they were pressed using 4 identical coil springs.
Probably going to need to construct an optical thickness detector using a cheap laser diode.... remember cameras that focus using IR lasers: Sony DSCF707 comes to mind (before on sensor contrast focusing.)
Maybe:
A rPi with camera and a little training would be a possible to detect the reflected pattern on the material.
Hacking the guts of a digital $10+ micrometer/vernier
A strain-gauge, spring loaded, lever arm would be an interesting approach
As for the points, order a 100 pogo pins and hand select matchers with identical spring tension.
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