I am on my senior year in college taking electronics engineering and currently working on a project that is a trash bin only taking in plastic bottles and giving incentives to the user depending on the properties of the deposited plastic bottle. I have an idea on how to detect the plastic bottle and measure the volume of the plastic bottle using distance measurement techniques. I wanted to also measure the wall thickness because this will determine the sturdiness of the bottle as it will be used for recycling. Is there a component that can measure the wall thickness of a plastic bottle that can be connected to an MCU? Thanks!

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    \$\begingroup\$ Not in isolation from other properties. Realistically this is probably not the best idea for a project, plastic recycling is complex and limited in even the best cases with a lot of alleged recyclables being diverted as waste given lack of capacity/market for them, so it's increasingly looking like solutions need to be source-side. Note that many existing reverse-vending systems read bar codes of the original product. \$\endgroup\$ – Chris Stratton Jun 22 at 19:32
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    \$\begingroup\$ If you know the volume, why not weigh the bottle. Thicker plastic will weigh more for a given volume. \$\endgroup\$ – user69795 Jun 22 at 21:50

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