得到風速計的數據一直是0零

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後來又試著另一個程式碼，也是風速計。
How to Hookup Davis Anemometer to Arduino (Part 2 of 3)

關於ISR function，我有查看它的說明是：不能回傳值，以及不可以使用時間函數，如：time, millis, delay
但是就是不知道應該怎麼改，要怎麼把debounced 判斷拉出來放在新的函數 (就是因為要判斷 debounced 所以才會出現時間函數)。

風速計程式碼2：

#include <math.h> 

#define WindSensorPin (2) // The pin location of the anemometer sensor 

volatile unsigned long Rotations; // cup rotation counter used in interrupt routine 
volatile unsigned long ContactBounceTime; // Timer to avoid contact bounce in interrupt routine 
float WindSpeed; // speed miles per hour 

void setup() { 
  Serial.begin(9600); 
  pinMode(WindSensorPin, INPUT); 
  attachInterrupt(digitalPinToInterrupt(WindSensorPin), isr_rotation, FALLING); 
  
  Serial.println("Davis Wind Speed Test"); 
  Serial.println("Rotations\tMPH"); 
} 

void loop() { 
  Rotations = 0;  // Set Rotations count to 0 ready for calculations 
  sei();          // Enables interrupts 
  delay (3000);   // Wait 3 seconds to average 
  cli();          // Disable interrupts 
  /* convert to mp/h using the formula V=P(2.25/T) 
     V = P(2.25/3) = P * 0.75 */
  
  WindSpeed = Rotations * 0.75;  
  Serial.print(Rotations); Serial.print("\t\t");Serial.println(WindSpeed); 
} 

// This is the function that the interrupt calls to increment the rotation count 
void isr_rotation () { 
  if ((millis() - ContactBounceTime) > 15 ) { // debounce the switch contact. 
    Rotations++; 
    ContactBounceTime = millis(); 
    } 
}

結果呢...還是顯示0