• Water Flow Sensor YF-S401 - circuitrocks
  • Water Flow Sensor YF-S401 - circuitrocks
  • Water Flow Sensor YF-S401 - circuitrocks
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Track Water or Liquid Flow with a Simple Sensor

The Water Flow Sensor YF-S401 is a flow sensor designed for liquid metering, pump feedback, and water system monitoring. It is a practical fit for makers, students, and engineers who want reliable sensor data in embedded builds.

Key details include Flow Rate Range: 1~ 5L/min; Working Voltage: DC 5V~24V; Output Pulse Duty Cycle: 50% ± 10%.

Important: Flow readings depend on liquid type, pipe size, and mounting direction. Calibrate in your own system for the best result.

Why you’ll love it

  • Compact, Easy to Install: Compact, Easy to Install
  • High Sealing Performance: High Sealing Performance
  • High Quality Hall Effect Sensor: High Quality Hall Effect Sensor
  • Useful spec: F = (98 * Q) ± 2% Q = L / MIN
  • Controller output: 50% ± 10%
  • Sensing range: 1~ 5L/min

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What you can build

This sensor is a good fit for smart water meters, coolant flow alarms, dosing systems, beverage dispensers, and irrigation monitors.

Starter bundles

Pair it with an Arduino-compatible board, ESP32, or Raspberry Pi, plus a breadboard or jumper wires for quick setup and testing.

Recommended add-ons

Useful add-ons include hose fittings, clamps, and a waterproof enclosure, depending on how you plan to power, mount, and log the sensor.

Technical specifications

Product Water Flow Sensor YF-S401
Flow Pulse Characteristics F = (98 * Q) ± 2% Q = L / MIN
Output Pulse Duty Cycle 50% ± 10%
Output Pulse High Level > DC 4.7V (input voltage DC 5V)
Flow Rate Range 1~ 5L/min
Working Voltage DC 5V~24V
Mini. Working Voltage DC 4.5V
Max. Working Current 15mA (DC 5V)
Internal Diameter 1.2mm;

Wiring & usage notes

Check the pin labels on the Water Flow Sensor YF-S401 and match them to your controller voltage, ground, and signal pins. Keep wiring short and verify the logic level before powering the module. Flow readings depend on liquid type, pipe size, and mounting direction. Calibrate in your own system for the best result.

What’s in the box

1 × Water Flow Sensor YF-S401

Frequently Asked Questions

What does the Water Flow Sensor YF-S401 measure? It is designed to measure liquid or air flow.
Can I use it with Arduino, ESP32, or Raspberry Pi? Yes. It is well suited for common maker and embedded platforms, as long as you power it at the correct voltage and match the signal level to your controller.
What affects accuracy? Power quality, wiring, mounting, target material, and the real environment can all affect the reading. It is best to test and calibrate in the final setup.
Is it good for prototyping? Yes. It is a practical choice for learning, proof-of-concept builds, and small automation projects.

Water Flow Sensor YF-S401 - 0.3-6L/min Hall Effect

Water Flow Sensor YF-S401 - 0.3-6L/min Hall Effect

21 in stock

Product Code

AB705

₱ 218.00
₱ 218.00
Sale Sold out
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