Humidity and temperature are important factors in the house. It may be the reason for good sleep, comfort. In the storage room also special conditions are required. Bu in order to maintain such conditions you need to know their value. So plastiboots put a handy humidity and temperature sensor using Arduino.
He used well known Newark Sensiron SHT11 Humidity/Temperature sensor. As an indicator, a nice Adafruit 128×32 OLED display was used. It’s a crisp, small footprint low power display. Apart from LEGO seems to serve as great housing.