//Blowing sensor
//Reads Analoge input from a simple fan as sensor
//calibates maximun and minimun value
//Writes Hihg and Low depending the values

int fanPin = 0;//fan sensor
int ledPin = 10;// tester and ouput to control 110 volts fan

int Readnum = 0; // Read and store initial value of the fan sensor
int mini = 1023; //min val sensro
int maxi = 0;//max val sensor
int increment = 0; //val that control the fan-led

void setup() {

 ///PIN Mode
 pinMode(fanPin, INPUT);
 pinMode(ledPin, OUTPUT);

 Serial.begin(9600);
}

void loop(){

  Readnum =analogRead(fanPin);//read the Piezo val

if(Readnum < mini){ //replace minimun valeue
mini = Readnum;
}

 if(Readnum > maxi){ //replace maximun value
    maxi = Readnum;
}

  increment = map(Readnum,mini,maxi,10,100);//map function to limit values of fan
  increment = constrain(increment,10,100);//constrain increment function to values

 //main condition: if increment and Readnum less than standard values, ledPin HIGH
if((increment < 50) && (Readnum <=270)){
digitalWrite(ledPin, HIGH);
delay(3500);//stays on for 3 seconds
digitalWrite(ledPin, LOW);
} else {//then goes of
digitalWrite(ledPin, LOW);
}

////print values//
Serial.print("Current:");
Serial.print(Readnum);
Serial.print(" Min:");
Serial.print(mini);
Serial.print(" Max:");
Serial.println(maxi);
Serial.print(" INC:");
Serial.println(increment);

delay(1000);//make easy to read the print values

}