Design watering system on greenhouse using microcontroller with matrix based

Chili commodities are urgently required by Indonesian citizens. Planting a chili are using two ways, with an open land such as a rich field and close land which is a greenhouse. In order to develop the highest quality for chili using greenhouse method, we need a right treatment to watering. Nowadays, many people still using a manual method to water plants with a long hose to reach all the plants in the garden. The purpose of this research is to give a solution regarding that issue which to make a new technology at watering plants using the automatic watering tool, therefore, we could save time and energy, also knowing the accuracy of motor stepper movement. This method research is designed and builds automatic watering tool with 3 rows x 3 columns with a total of 9 plants and method using soil moisture sensor. The result of this research proving that accuracy of the stepper motor is 99,48%, errors that occur in the movement of the stepper motor is very minimal and this watering system is working when the moisture content in a soil is less than 60%.