I am trying to find out which sensor can detect small objects that don't have a high capacitance. I built a simple circuit that uses a 330 Ω resistor and an LED. The light turns on when I touch the analog wire, but if I place any small object on it, it does not turn on.
You need to define these objects, and what they are made of. Without that information you cannot get an accurate answer.
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I believe its made out of platinum
Is that what you are sensing? What size ie. define them.
Yes, it's a small size platinum piece that's < 3mm
Is this some type of security thing? Without more information about your secret device there is not much more I can offer.
That is because you need two wires to measure capacitance.
Where can I add the second wire
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When a large object comes to the sensor wire, the object is detected.
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The operative word is large.
To GND