Wind Speed Sensor (4-20mA/0-5V) - Anemometer

JL-FS2 Wind Speed Sensor (current / voltage type) 

Sample Code

/*
Wiring: VCC (Red), GND (Black), Voltage (Yellow), Current (Blue)

Connect the voltage signal wire to Arduino analog interface:

Yellow Cable<---->A0

*/

  void setup()

 {  

   Serial.begin(9600);

 }

 void loop()

 {

   int sensorValue = analogRead(A0);

   float outvoltage = sensorValue * (5.0 / 1023.0);

   Serial.print("outvoltage = ");

   Serial.print(outvoltage);

   Serial.println("V");

   int Level = 6*outvoltage;//The level of wind speed isproportional to the output voltage.

   Serial.print("wind speed is ");

   Serial.print(Level);

   Serial.println(" level now");

   Serial.println();

   delay(500);