I have a project that requires to separate paper and plastic materials using capacitive proximity sensor. I'm going to use two capacitive proximity sensor, so how can I calibrate to detect paper materials only in one capacitive proximity sensor and in the other capacitive sensor to be use to detect plastic materials only?
Prepare two samples that have identical dimensions and place against the sensor and record the capacitance values.
Using capacitance is unlikely to work for real-world mixed rubbish recyling as the paper and plastic dielectric constants have overlapping ranges, plus there will be contaminants, food being a particular problem because of the water it contains.
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Hi, thanks for the reply but I wanna ask if this capacitance value is related to the coding programming to calibrate the capacitive proximity sensor to detect only one material which is paper materials
Check this paper out: https://www.researchgate.net/publication/315480619_Application_of_Capacitance_Proximity_Sensor_for_the_Identification_of_Paper_and_Plastic_from_Recycling_Materials
Doing what you want with different materials will be difficult especially if they are not the same size.
Do you have the values for the dielectric constants of the materials you hope to differentiate?
(hint - there are different knids of plastics)
also some idea of the shape, dimensions and orientation of the "samples"
Hi, @donutszzz
Is this associated with this;
Tom.... 
You can't. Just like you can't detect metals at a distance using inductive sensors.
You seem to be trying to do the impossible in both cases.
Time to re-think this design.
No, it is not associated with that topic. I found a way about this topic since I saw someone post a topic just like mine. They said that I can calibrate the capacitive proximity sensor to differentiate the paper and plastic materials.