glass sensor -plastic sensor

oumasa:
hello, I'm doing a smart trash that serves to sort the different types of waste (metal, cardboard, plastic and glass) I want to work with sensors but I found difficulties in detection between plastic glass and cardboard
do you have any ideas on how to distinguish between these types of waste
I will be very grateful if you will help me
thank you

Sort of basic questions about your system. What do you intend to happen if such material can be detected? What are the minimum and maximum sizes are you waste material?

Paul