1/2 Inch Water Flow Sensor – YF-S201

1/2 Inch Water Flow Sensor – YF-S201
The YF-S201 water flow sensor is a device that is used to measure the flow rate of water. It consists of a turbine-type rotor that is placed in the water stream, and as the water flows past the rotor, it causes the rotor to spin. The sensor measures the speed of the rotor and converts it to a flow rate. The sensor has a digital output, which means that it provides a digital signal that can be read by a microcontroller or other host device.
The sensor is commonly used in applications such as irrigation systems, water treatment plants, and industrial process control. It is often preferred over other types of flow sensors because it is easy to install and has a low cost. Water flow sensors are installed at the water source or in pipes to measure the rate of flow and calculate the amount of water that has passed through the pipe. Water flow is measured in liters per hour or cubic meters.
Working:
A water flow sensor is made up of a plastic valve through which water can pass. A water rotor and a hall effect sensor are used to sense and measure the flow of water.
When water flows through the valve, it causes the rotor to rotate. The motor’s speed can be changed as a result of this. The hall effect sensor calculates this change and outputs it as a pulse signal. The rate of flow of water can thus be measured.
The Hall effect is the primary operating principle of this sensor. The rotation of the rotor induces a voltage difference in the conductor in this sensor, according to this principle. This induced voltage difference runs in the opposite direction of the electric current. When the moving fan rotates due to the flow of water, the rotor rotates, inducing a voltage. The hall effect sensor measures the induced voltage and displays it on the LCD display.
read more : What is a Water Sensor?
The water flow sensor can be used with hot, cold, or warm water, as well as clean or dirty water. A microcontroller board such as Arduino , Raspberry pi, a LCD display or OLED Display , Breadboard and connecting wires are required for this. The sensor is installed at the water source inlet or the pipe opening. Three wires are connected to the sensor. The red wire connects to the supply voltage. A black wire connects to the ground, and a yellow wire collects the Hall effect sensor output. 5V to 18V DC is required for supply voltage.
Also, read our blog on the Water Level Sensor explaining the different types of water sensors, working, and applications.
Connection details:
Red wire : +5V
Black wire : GND
Yellow wire : PWM output.
Features:
Lightweight, small in size, and simple to install.
Durable wearable impeller shaft 
The upper and lower force structure seal ring never leaks.
Chemical erosion and nonviolent shock
No hitting or throwing.
Vertically mounted
Applications:
This sensor can be used in water heating systems
Automatic water dispensers
Irrigation systems
Other flow metering equipment.
Package Includes:
1 x Water Flow Sensor – YF-S201
Specifications
Model 
YF-S201
Sensor Type
Hall effect
Working Voltage
5 to 18V DC
Working Flow Rate
1 to 30 Liters/Minute
Maximum water pressure
2.0 MPa
Output rise time
0.04us
Output rise time
0.04us
Output fall time
0.18us
Pulses per Liter
450
Frequency (Hz)
7.5 * Flow rate (L/min)
Compatibility 
1/2″ nominal pipe connections, 0.78″ outer diameter, 1/2″ of thread
Dimensions 
2.5″ x 1.4″ x 1.4″
Weight 
25 grams