Hi,
I want to create a project that rewards us with a chocolate when we dump a single biscuit wrapper or paper waste into the dustbin. I think we should use pir to sense the motion, but I want to make it give reward only when original waste is thrown. Is there any way? If yes, looking forward for your help!
Thank You in Advance! 
A PIR does not sense motion. Rather, it senses Passive InfraRed radiation, typically from a living being
It sounds like you will need to reconsider your plans
If you can ensure that the waste cuts a light beam when it is thrown then that may offer a way forward
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