Mini Water Flow Sensor (White)
Mini Water Flow Sensor (White)
Overview
Compact inline water flow measurement sensor
Common model: YF-S201 (mini type)
Measures flow rate and total water volume
Compatible with Arduino, ESP32, Raspberry Pi
Working Principle
Water flows through a turbine (rotor) inside the sensor
Rotor spins based on flow rate
Hall-effect sensor detects rotation
Generates pulse signals
Microcontroller counts pulses calculates flow rate & volume
Key Specifications
Operating Voltage: 4.5V 18V DC
Current Consumption: 1 30 L/min
Output Type: Digital pulse (TTL)
Pulse Rate: ~450 pulses per liter
Accuracy: 10%
Max Pressure: 1.752.0 MPa
Temperature Range: -25C to 80C
Module Components
Plastic (PVC/nylon) body
Internal turbine rotor with magnet
Hall-effect sensor
3-wire cable:
Red VCC
Black GND
Yellow Signal output
Features
Small and lightweight design
Easy inline pipe installation
High sealing /
Applications
Water dispensers
Smart water meters
DIY flow monitoring projects
Irrigation systems
Liquid dispensing machines
Usage Tips
Install according to flow direction arrow
Avoid air bubbles and debris
Use clean water for longer life
Keep sensor horizontal or vertical (slight tilt allowed)
Calibrate for better accuracy
Advantages
Low cost and widely available
Easy interface with microcontrollers
Compact size (mini design)
Reliable for general-purpose flow measurement
Limitations
Moderate accuracy (10%)
Sensitive to turbulence and impurities
Needs calibration for precise measurements
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Summary
A mini, low-cost water flow sensor
Uses Hall-effect + turbine mechanism
Outputs pulse signals for flow calculation
Best for DIY, IoT, and small water systems
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