This Arduino project was part of an Association of Mechanical Engineers (ASME) contest to create an Autonomous Material Sorter. The sorter was to sort four glass bottles, four plastic bottles, four Tin cans, and four Aluminum cans. There were requirements such as size of the bottles and size of the machine. The machine had to be able to sort the bottles and cans automatically after being started and had to run off of a dry-cell rechargeable battery. The full machine requirements can be read in the PDF file 'ASME'.