'getSalinitySensorPeriod' was not declared in this scope..how to solve that?

code: [select]


//constant won't change
const int salinitysensorpin = 2 ; //salinity sensor pin

//setup fucntion run @ beginning of program

void setup()
{
  serial.begin(9600); //set data rate 9600 bps
  pinmode (salinitysensorpin, input);

}

//repeating
void loop()
{
  //cheack salinity period , calculate salinity frequency
  float salinityperiod = getsalinitysensorperiod (); //assign return value
  float salinityfrequancy= 1000 / salinityperiod ; // calculate frequency

   //display period , frequency
   serial.print("salinityperiod = ") ; //display salinity period
   serial.print(salinityperiod); //display measured period
   serial.println(" us"); //microsecond unit
   serial.print("salinityfrequency = ");//display salinity frequency
   serial.print (salinityfrequency,3);//display neasure frequency
   serial.println(" khz");//unit heartz

   //apply treadline convert percent salinity display salinity
   float salinityvaluepercent = 0.01 * salinityfrequency + 0.05;//salinity percent
   serial.print("salinity (before calibrated)= %";//salinity = '
   serial.print(salinityvaluepercent,2);//display measured in percent mass
   serial.println(" %");//display percent
   delay(2000);// 1 second delay in read
   
   
}
//a function retrieving salinity sensor reading
//in period of microseconds
int getsalinitysensorperiod()
{
  int timestart = 0 ;
  int timestop = 0 ;
  //wait pin go low
  while( low ! = digitalread(salinitysensorpin)){}
 
  //wait pin go high , reacord time
  while (high ! = digitalread(salinitysensorpin){}
  timestart = micros();
 
  //wait pin go low second time
  while (low ! = digitalread(salinitysensorpin)){}
 
  //wait pin go high , record time
  while(high ! = digitalread(salinitysensorpin)){}
  timestop = micros();

    //return in period diffrent between
    return timestop - timestart;
 
}



 getsalinitysensorperiod ()  != getsalinitysensorperiod()

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