YF-S201 Water Flow Sensor - 1-30L/min, Hall Effect | Compoden
YF-S201 Water Flow Measurement Sensor – 1 to 30 L/min
The YF-S201 is a hall-effect water flow sensor that outputs a frequency signal directly proportional to flow rate. It's ideal for DIY liquid flow measurement in irrigation, vending machines, and industrial monitoring. With a simple pulse output, it integrates easily with microcontrollers like Arduino and Raspberry Pi.
Key Specifications
| Specification | Value |
|---|---|
| Flow Rate Range | 1–30 L/min |
| Output | Square wave (Freq = 7.5 × L/min) |
| Operating Voltage | 5–24V DC |
| Max Current | 15 mA @ 5V |
| Pipe Diameter | 10mm (3/8 inch) barb |
| Accuracy | ±10% |
What You Can Build With This
- Build an automatic plant watering system that dispenses precise amounts.
- Create a water consumption monitor with an IoT dashboard.
- Design a flow-based coffee machine controller for perfect brew ratios.
- Set up a leak detection alarm that triggers when unexpected flow occurs.
Compatibility
Works with any microcontroller capable of reading pulse signals: Arduino Uno, Nano, ESP32, Raspberry Pi. Operates on 5-24V, but output is 5V pulse, so level shifting may be needed for 3.3V logic. Commonly paired with solenoid valves and relays.
Wiring Notes
Red wire to power (5-24V), black to ground, yellow to digital input. Use internal pull-up if needed; output is open collector so a pull-up resistor (10kΩ) to Vcc is recommended. Keep sensor dry on electronics side.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes, the YF-S201 outputs a 5V pulse that can be read using any Arduino digital pin. A simple pulse counting sketch can convert frequency to flow rate.
Can it measure reverse flow?
No, this sensor is unidirectional and only measures flow in the direction of the arrow marked on the body.
Is it submersible?
Only the flow path is in contact with water; the sensor body and electronics must remain dry.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items