Automatic Control of Temperature, Air Humidity and Soil Humidity Using Arduino Uno Programming and Microcontroller in GreenHouse Applications During Covid-19 pandemic, people are called for stay and work at home. This condition might be difficult for some works that require in-field actions such as agricultural works, in this case is Green House farming of SMK Negeri 3 Salatiga. A built automatic system is needed in order to maintain plant’s grows and health with any treatments that are necessary without people doing it manually on site. Muktitika was involved from the programming process to assembling the controller. Simulation video on the prototype was done by Ibu Sugiartini, S.Pd. http://tiny.cc/OtomatisasiArduino