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The YF-S201 water flow sensor is a Hall-effect flow meter designed to measure water flow rates from 1 to 30 litres per minute. It has a G1/2 inch threaded connection and a pulse output, so it is easy to connect to Arduino, ESP32, Raspberry Pi and other microcontrollers.
The listing presents it as ideal for water monitoring, smart irrigation, automation and IoT projects.
It uses a three-wire interface (VCC, GND and pulse signal) and can be powered from 5V to 18V DC.
Accurate flow measurement: detects water flow from 1 to 30 L/min.
Hall-effect technology: provides a reliable pulse output signal.
G1/2 threaded port: easy integration into water pipelines.
Wide voltage support: operates from 5V to 18V DC.
Easy 3-wire interface: quick and simple connection.
Microcontroller compatible: Arduino, ESP32, Raspberry Pi, NodeMCU, STM32, AVR and PIC.
Low power consumption: suitable for continuous monitoring.
Inside the sensor a small rotor spins as water flows through it. A magnet on the rotor passes a Hall-effect sensor, which produces a pulse each time. The faster the water flows, the faster the rotor turns and the more pulses per second the sensor sends.
Your microcontroller counts the pulses and converts them to a flow rate. The listing gives a pulse constant of about 450 pulses per litre, which you can use to calculate flow rate and total volume. Calibrate against a known volume for the best accuracy, since flow rate, pressure and installation orientation all affect the result.
In a spraying system, a flow sensor lets you check that the pump and nozzles are delivering the expected amount of liquid and warn you about a blocked nozzle or an empty tank.
Monitoring spray flow on agricultural drone systems
Smart irrigation and water dispensers
Automation and IoT projects
Measuring water consumption
Detecting no-flow or blockage conditions
Connections per the listing: red wire to +5V, black wire to GND and yellow wire for the pulse output. The thread size is G1/2 inch (BSP), the colour is black and the operating temperature reaches about 80 degrees C.
The listing describes compatibility with Arduino, ESP32, Raspberry Pi, NodeMCU, STM32, AVR and PIC boards.
Model: YF-S201
Type: Hall-effect water flow sensor
Measuring range: 1-30 L/min
Operating voltage: 5-18V DC
Thread: G1/2 inch (BSP)
Pulse constant: about 450 pulses per litre
Wires: red +5V, black GND, yellow pulse signal
Operating temperature: up to about 80 C
Colour: black
1 x YF-S201 water flow sensor (black)
Makers and drone builders who want to measure water flow in irrigation or spray systems.
1 to 30 L/min.
5 to 18V DC.
As pulses, about 450 per litre.
G1/2 inch.
Arduino, ESP32, Raspberry Pi and other microcontrollers.
One YF-S201 water flow sensor.
| Brand | Generic |
|---|---|
| Connector | G1/2 inch |
| Input Voltage | 5-18V DC |
| Measuring Range | 1-30 L/min |
| Operating Temperature | Up to about 80 C |
| Pulse Constant | about 450 pulses per litre |
| Sensor Type | Hall-effect water flow sensor |
| Selling unit | PCS |
