The Water Flow Sensor YF-S401 Flowmeter is a compact and efficient liquid flow measurement sensor designed for accurate monitoring of water flow in various electronic and automation systems. Built with a durable plastic body and integrated Hall effect sensor technology, this device detects water movement through a rotating internal rotor and converts it into digital pulse signals that can be easily read by microcontrollers such as Arduino, ESP8266, ESP32, Raspberry Pi, and other embedded systems.

When water flows through the sensor, the internal rotor spins with the help of a propeller, generating magnetic pulses detected by the Hall effect sensor. These pulses correspond to the flow rate, allowing the system to measure and calculate water usage or liquid flow in real time. The YF-S401 sensor supports a flow range of 0.3 to 6 liters per minute, making it ideal for small flow measurement applications.

This sensor is commonly used in smart water systems, automatic dispensing machines, coffee machines, water purifiers, irrigation systems, and DIY electronics projects where precise water flow monitoring is required.

Features:

• High precision water flow sensor for low-flow measurement applications

• Built-in Hall effect sensor for accurate digital pulse output

• Durable plastic housing designed for water systems

• Internal rotor with propeller for stable flow detection

• Compact design suitable for small piping systems

• Compatible with Arduino, Raspberry Pi, ESP8266, ESP32, and other microcontrollers

• Low power consumption for energy-efficient operation

• Provides real-time flow data for automation and monitoring systems

• Easy integration into embedded electronics projects

• Suitable for liquid flow monitoring in smart systems and DIY automation

Specifications:

• Model: YF-S401

• Operating Voltage: 5V – 12V DC

• Working Current: 15mA (at 5V DC)

• Flow Measurement Range: 0.3 – 6 L/min

• Maximum Water Pressure: ≤ 0.8 MPa

• Water Passage Diameter: 3.5 mm

• Output Signal Type: Digital pulse output

• Sensor Type: Hall effect flow sensor

• Housing Material: Durable plastic

How to Use:

• Connect the sensor's VCC pin to 5V or 12V power supply

• Connect the GND pin to system ground

• Connect the signal output pin to a digital input pin of the microcontroller

• Install the sensor inline with the water pipe ensuring correct flow direction

• Use software to count pulse signals generated by the Hall sensor

• Convert pulse frequency to flow rate using calibration formula

• Ensure water pressure does not exceed specified limits

• Avoid air bubbles or debris in the water line for accurate readings

Applications:

• Smart water monitoring systems

• Automatic beverage or coffee machines

• Water purification and filtration systems

• DIY Arduino water flow measurement projects

• Liquid dispensing machines

• Agricultural irrigation monitoring

• Industrial liquid measurement systems

• Smart home automation water management

• Laboratory fluid measurement setups

Package Includes:

• 1 × Water Flow Sensor YF-S401 Flowmeter

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