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1/2 Inch Water Flow Sensor - YF-S201

1/2 Inch Water Flow Sensor - YF-S201

β‚Ή184.00Price

πŸ“Œ Overview

The YF-S201 Water Flow Sensor is a widely used module for measuring liquid flow rate and volume in pipes. It is commonly used in Arduino and IoT projects.

πŸ‘‰ It is designed for 1/2-inch pipes and works by generating pulses as water flows through it.

🧠 Working Principle

  • Inside the sensor β†’ a rotating impeller (fan)

  • Water flow spins the impeller

  • A Hall Effect sensor detects each rotation

  • Each rotation β†’ generates a pulse

πŸ‘‰ By counting pulses, you can calculate:

  • Flow rate (L/min)

  • Total volume (Liters)

βœ” Example formula:

  • Flow rate (L/min) = Frequency / 7.5

πŸ“Š Infographic Summary

β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚ πŸ’§ YF-S201 FLOW SENSOR β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚ 🎯 Function: Measure water β”‚
β”‚ πŸ“ Flow Range: 1–30 L/min β”‚
β”‚ ⚑ Voltage: 5V – 18V β”‚
β”‚ πŸ”Œ Output: Pulse Signal β”‚
β”‚ 🧠 Type: Hall Effect Sensor β”‚
β”‚ πŸ“ Size: 1/2 inch pipe β”‚
β”‚ πŸ“Š Accuracy: Β±10% β”‚
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

πŸ”Œ Pin Configuration

β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
β”‚ YF-S201 β”‚
β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
β”‚ Red β†’ VCC (5–18V)
β”‚ Black β†’ GND
│ Yellow→ Pulse Output
β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

βš™οΈ Key Specifications

  • ⚑ Operating Voltage: 5V – 18V DC

  • πŸ’§ Flow Range: 1 to 30 L/min

  • πŸ”Œ Output: Digital pulse (TTL)

  • πŸ“Š Pulses per Liter: β‰ˆ 450 pulses

  • 🎯 Accuracy: Β±10%

  • 🌑 Temperature: -25Β°C to 80Β°C

  • πŸ’₯ Max Pressure: 2.0 MPa

🌟 Key Features

  • πŸ’§ Measures both flow rate & total water usage

  • ⚑ Low power consumption (~15mA)

  • πŸ”§ Easy to install inline with pipe

  • πŸ” Stable pulse output for microcontrollers

  • πŸ’° Low-cost and reliable

πŸ§ͺ Applications

  • 🚰 Smart water meters

  • 🌱 Irrigation systems

  • 🏠 Home automation (water monitoring)

  • β˜• Beverage dispensing machines

  • πŸ€– Arduino/ESP32 projects

  • πŸ’‘ Leak detection systems

πŸ”— Interfacing

Compatible with:

  • πŸ”΅ Arduino

  • πŸ“‘ ESP32 / ESP8266

  • πŸ“ Raspberry Pi

πŸ‘‰ Connect pulse output to a digital interrupt pin to count pulses.

⚠️ Important Notes

  • πŸ”„ Must follow flow direction arrow for accurate results

  • ⏳ Needs calibration for precise measurement

  • ❌ Not suitable for dirty or corrosive liquids

  • ⚠️ Minimum flow required to rotate impeller

πŸ’¬ From real user experience (Reddit insight):

Reverse flow may work but gives inaccurate readings

πŸ†š YF-S201 vs Other Flow Sensors

SensorPipe SizeFlow RangeUse Case
YF-S2011/2 inch1–30 L/minGeneral projects
YF-S401SmallerLow flowPrecision systems
YF-S402LargerHigher flowIndustrial use

πŸ’‘ Pro Tip

To build a smart water meter:

  • YF-S201 + Arduino

  • LCD/OLED display

  • WiFi module (ESP8266/ESP32)

πŸ‘‰ Track real-time water usage and detect leaks!

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