Design an automatic plant watering device that uses the Arduino Nano platform as its base. The aim of this research is to develop an efficient and water- saving plant watering automation system. This tool is designed to monitor soil moisture and automatically water plants when soil moisture drops below a specified limit. This tool development method involves designing both hardware and software. On the hardware side, the soil moisture sensor and water pump are controlled by Arduino Nano, while on the software side, an Arduino program was developed to set the watering algorithm based on soil moisture data. Test results show that this tool can work well in maintaining the desired soil moisture level and reducing water waste. In the context of modern agriculture which increasingly demands resource efficiency, this automatic plant watering device can be a valuable solution for farmers and plant lovers. Additionally, integration with remote control via smartphone app provides ease of use and better monitoring. This research makes a positive contribution in developing agricultural automation technology that is environmentally friendly and sustainable
