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1/8 Inch Water Flow Sensor YF-S401

1/8 Inch Water Flow Sensor YF-S401

₹206.00Price

📌 Overview

The YF-S401 Water Flow Sensor is a compact sensor used to measure water flow rate in small pipes.

👉 Ideal for:

  • 🚰 Water dispensing systems

  • 🌱 Irrigation systems

  • 🤖 Arduino & IoT projects

  • ☕ Coffee machines & appliances

🧠 Working Principle

  • Inside → rotating turbine (rotor) + Hall Effect sensor

  • Water flows → rotor spins

  • Speed of rotation ∝ flow rate

  • Sensor outputs pulse signals

👉 Based on Hall Effect

✔ More flow → more pulses

📊 Infographic Summary

┌──────────────────────────────┐
│ 💧 YF-S401 FLOW SENSOR │
├──────────────────────────────┤
│ 🎯 Measures: Water flow │
│ 📏 Range: 0.3–6 L/min │
│ ⚡ Voltage: 5V–24V │
│ 🔌 Output: Pulse signal │
│ 📦 Size: 1/8 inch │
│ 🧠 Tech: Hall Effect │
└──────────────────────────────┘

🔌 Pin Configuration

┌────────────────────┐
│ YF-S401 Sensor │
├────────────────────┤
│ Red → VCC (5–24V)
│ Black → GND
│ Yellow→ Signal
└────────────────────┘

⚙️ Key Specifications

  • ⚡ Operating Voltage: 5V – 24V DC

  • 📏 Flow Range: 0.3 – 6 L/min

  • 🔌 Output: Digital pulse signal

  • 🎯 Accuracy: ±5%

  • 🔋 Current Consumption: ~15 mA

  • 🌡 Max Liquid Temp: up to 120°C

  • 💧 Pressure: up to ~0.8–2 MPa

🔄 Pulse Output Formula

👉 Typical relation:

  • 1 Liter ≈ 5880 pulses

So,

  • Flow rate = pulses per second ÷ calibration factor

🌟 Key Features

  • 💧 Compact 1/8" pipe size

  • ⚡ Low power consumption

  • 🔧 Easy to interface

  • 📊 Pulse output (easy to count)

  • 📦 Waterproof internal design

🧪 Applications

  • 🚰 Water flow monitoring

  • 🌱 Smart irrigation systems

  • ☕ Coffee/tea machines

  • 🧪 Liquid dispensing systems

  • 🤖 IoT water management

  • 🏭 Cooling systems (CNC/laser)

🔗 Interfacing

Compatible with:

  • 🔵 Arduino

  • 📡 ESP32 / ESP8266

  • 🍓 Raspberry Pi

👉 Connect signal → digital pin (interrupt recommended)

🔄 Working Example

👉 Water Monitoring System:

  • Water flows through sensor

  • Rotor spins

  • Pulses generated

  • Microcontroller counts pulses

  • Displays flow rate or total volume

⚠️ Important Notes

  • ⚠️ Must be installed vertically for accuracy

  • ⚠️ Avoid air bubbles (affects readings)

  • ⚠️ Not suitable for dirty/corrosive liquids

  • ⚠️ Needs calibration for precise measurement

🆚 YF-S401 vs YF-S201

FeatureYF-S401YF-S201
Pipe Size1/8 inch1/2 inch
Flow Range0.3–6 L/min1–30 L/min
Use CaseSmall systemsMedium systems

💡 Pro Tip

  • Use interrupt pin for accurate pulse counting

  • Add filter or debounce logic in code

👉 Perfect for low-flow precision measurement projects

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