Quantity   Component name
1 × Arduino Pro Micro http://www.ebay.ca/itm/New-Pro-Micro-ATmega32U4-5V-16MHz-Replace-ATmega328-Arduino-Pro-Mini-/221891843710?hash=item33a9c8d67e:g:D70AAOSwVL1V~1dn
2 × HC-SR04 Ultrasonic Distance Sensor 1 required per door - http://www.ebay.ca/itm/1pcs-Ultrasonic-Module-HC-SR04-Distance-Measuring-Transducer-Sensor-for-Arduino-/400985326881?hash=item5d5c968521:g:kLQAAOxyNyFS-xFw
1 × Neopixel-style LED strip I cut 10 LEDs from a 1M, 144 LED strip - http://www.ebay.ca/itm/WS2812B-5050-RGB-LED-Strip-5M-150-300-Leds-144-30LED-M-Individual-Addressable-5V-/322058431958?var=&hash=item4afc2dadd6:m:mh5wcqoaZysJUIMArGeSHSg
2 × HC-SR04 3D printed housing 1 per sensor - http://www.thingiverse.com/thing:1170335