In this project, we will learn about the IoT Based Smart Agriculture & Automatic Irrigation System with Nodemcu ESP8266. Agriculture plays a vital role in the development of agricultural countries. Some issues concerning agriculture have been always hindering the development of the country. Consequently, the only solution to this problem is smart agriculture by modernizing the current traditional methods of agriculture. Hence the method is making agriculture smart using automation and IoT technologies. The Internet of Things (IoT) enables various applications of crop growth monitoring and selection, automatic irrigation decision support, etc. We proposed the ESP8266 IoT Automatic irrigation system to modernize and improve the productivity of the crop. This project explains how to make IoT Smart Agriculture with Automatic Irrigation System using some simple sensors that are available in the market. Irrigation is the supply of controlled and adequate amounts of water to the soil to enable the proper growth of plants. Primitive irrigation practices have notable issues such as water wastage, underwatering of crops, high labor intensity, etc. Recent developments in technology have led to several methods of automating the irrigation process on farms to combat the aforementioned problems and improve crop yield. Most implementations of automated irrigation involve sensors, a processing device (e.g. a microcontroller), and actuators. The sensors collect data (e.g. soil moisture, humidity, temperature) from the farm, then the microcontroller processes the sensor data to determine the right time to supply water to the crops being planted.