Quantity   Component name
1 × Arduino YUN Microcontroller http://arduino.cc/en/Main/ArduinoBoardYun?from=Products.ArduinoYUN
1 × SHT11 Sensirion Temperature/Humidity Sensor http://www.adafruit.com/products/246
1 × Banggood relay board A 5 volt relay will do fine, but this board is nice. http://www.banggood.com/Wholesale-5V-2-Channel-Relay-Module-Shield-for-Arduino-ARM-PIC-AVR-DSP-Electronic-10A-p-48610.html
1 × Switch To monitor open/closed status of door
1 × A openHAB server