Quantity   Component name
1 × Arduino Mega
1 × Electronics enclosure https://uk.rs-online.com/web/p/general-purpose-enclosures/1959119
24 × IR beam break sensor https://thepihut.com/products/ir-break-beam-sensor-5mm-leds
12 × Single port ethernet connector https://uk.rs-online.com/web/p/ethernet-connectors/8183324/?relevancy-data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searchHistory=%7B%22enabled%22%3Atrue%7D
2 × 6-port ethernet connector https://uk.rs-online.com/web/p/ethernet-connectors/8208353/?relevancy-data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searchHistory=%7B%22enabled%22%3Atrue%7D
12 × Ethernet cable https://uk.rs-online.com/web/p/ethernet-cable/2948291/?relevancy-data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searchHistory=%7B%22enabled%22%3Atrue%7D
12 × LED https://thepihut.com/products/ultimate-5mm-led-kit
12 × 330 ohm resistor https://thepihut.com/products/ultimate-resistor-kit
24 × 10 x 3 mm neodymium magnet (optional) https://www.amazon.co.uk/gp/product/B07QKWBS4S/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
24 × Neodymium magnet in holder (optional) https://www.amazon.co.uk/gp/product/B07QKV4BVT/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1