Design of Mini Climate Chamber with IoT Based Control for Lettuce

The purpose of this research was to design the mini climate chamber with IOT based control and to study the energy consumption of this chamber for lettuce cultivation. In this study, the climate chamber/tent with a volume of 1.4 cubic meters was built and equipped with an air conditioner of 3000 Btu for controlling air temperature and relative humidity. The test chamber can be controlled by both automatic and manual system at 25 °C from 8:00AM to 8:00PM, and at 60%RH from 8:00PM to 8:00 AM of the next day. Lighting control system operates from 8:00 AM to 4:00 PM using LED lamps. Water system runs from 8.15 AM to 8.30 AM using a 12 Vdc water pump. IOT board ESP8266 used to transmitted data between devices. Interval of temperature and relative humidity measurement is every 5 minutes. The results showed that the microclimate chamber had an average room temperature of 23.9 °C, average room relative humidity of 63.3 %RH with a tolerance of ±1.1 °C and ±3.3 %. RH, respectively. Total electric energy consumption is about 4.57 units/day. The temperature control mode consumes 3.05 units/day and humidity mode use 1.52 units/day. Temperature control mode consumes approximately one times more electricity than humidity control mode. In addition, the VPDair value can be controlled at 1.08 kPa, which is an indicator of the quality of salad cultivation. In conclusion, this research can improve the cultivation of lettuce well.
Keywords: Design of climate, Internet of Things (IoT), Lettuce