Description
The YF-S401 Flow Sensor uses a Hall-effect sensor to detect the rotation of a turbine inside the module. Each rotation generates a pulse, which can be counted by a microcontroller to measure water flow rate in liters per minute. It is widely used in IoT water monitoring, water dispensers, irrigation systems, and DIY smart home projects. The sensor operates at low voltages, is easy to interface, and provides real-time flow measurements.
Key Features
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Hall-effect sensor-based flow detection
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Measures water flow in liters per minute
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Pulse output for microcontroller interfacing
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Operating voltage: 5–18V DC
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Flow range: 1–30 L/min
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Compact and lightweight for easy integration
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Compatible with Arduino, ESP32, and Raspberry Pi
Variants
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YF-S401 Standard Flow Sensor
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YF-S401 with 1/2″ or 3/4″ G1/2 threaded connectors
Specifications
| Feature | Details |
|---|---|
| Sensor Type | Hall-effect |
| Operating Voltage | 5–18V DC |
| Flow Range | 1–30 L/min |
| Output Type | Pulse |
| Max Pressure | 1.75 MPa |
| Operating Temperature | 0–80°C |
| Thread Size | G1/2 (standard) |
| Dimensions | 72 × 35 × 27 mm |
Applications
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Water flow monitoring and measurement
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Smart water meters and IoT projects
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Irrigation and water distribution systems
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Water dispensers and filtration systems
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DIY liquid flow experiments with microcontrollers
Compatible Boards / Circuits
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Arduino Uno, Mega, Nano
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ESP32 / ESP8266
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Raspberry Pi (via GPIO)
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Any microcontroller capable of counting pulses
Reviews
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