The YF-S201 Water Flow Sensor is a compact and practical device designed to measure the flow of water through a pipe. It uses an internal rotor and Hall-effect sensing mechanism to detect water movement and generate electrical pulses corresponding to the flow rate.

With a working flow range of approximately 1–30 L/min and a maximum water pressure of up to 1.75 MPa, this sensor is suitable for a variety of water-monitoring and automation applications. Its threaded inlet and outlet make it convenient to integrate into compatible plumbing or tubing systems.

The sensor provides a simple three-wire interface, typically consisting of power, ground, and pulse-output connections. The pulse signal can be read by an Arduino, ESP32, Raspberry Pi interface, or other compatible microcontroller to calculate water flow and monitor water usage.

It is ideal for water dispensers, irrigation systems, automatic water-control projects, flow monitoring, DIY electronics, and smart water-management systems. Its compact construction makes it easy to install where space is limited.