<p>➀ The article discusses the development of an automatic water level indicator and controller device that addresses the drawbacks of existing water level indicators and controllers. This device uses Arduino Uno and includes components like water level sensors, LEDs, and a relay.</p><p>➁ The circuit diagram and working principle of the device are explained, detailing how the pump operates based on the water level detected by the sensors.</p><p>➂ Instructions for testing the device and downloading the source code are provided, along with insights from the author about the project's potential applications.</p>