test3_switchcase

#include <TimerThree.h>

const byte interruptPin = 3;
volatile bool pulseFlag;
volatile bool runFlag;
volatile unsigned long newTime;
volatile unsigned long oldTime;
volatile unsigned long newDeltaT;
volatile unsigned long oldDeltaT;
unsigned long oldVelocity;
unsigned long newVelocity;
long deltaV;
unsigned long otCopy;
unsigned long ntCopy;
uint8_t pulseCount;

void setup() {
  Serial.begin(115200);
  Timer3.initialize(5000); //initialize timer3 with for 5mS (200Hz)
  Timer3.attachInterrupt(timeCheck); //call timeCheck function on compare match
  pulseCount = 0;
  oldTime = 0;
  newTime = 0;
  pinMode(6, OUTPUT);
  digitalWrite(6, LOW);
  pinMode(interruptPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(interruptPin), readTime, FALLING);
}


void readTime() {
  noInterrupts();
  oldTime = newTime;
  newTime = millis(); //record time of pulse from timer1
  pulseCount ++; // increment a pulse count byte. 0 = wait for another pulse, 1 = do stuff, >1 = missed pulses
  pulseFlag = true;
  interrupts();
}


void timeCheck() {
  noInterrupts();
  if (pulseFlag == true) {
    
    switch (pulseCount) {      
      case '1':        
        runFlag = false;
        break;
      case '2':        
        runFlag = true;
        pulseCount = 1;
      default:
        runFlag = false;
        pulseCount = 0;
    }
    pulseFlag = false;
  }
  interrupts();
}
  
  

void loop() {
  if (runFlag == true) {    
    noInterrupts();
    otCopy = oldTime; //copy shared data to a safe place to math it
    ntCopy = newTime;
    interrupts();
    oldDeltaT = newDeltaT; //math stuff
    newDeltaT = ntCopy - otCopy;    
    oldVelocity = newVelocity;    
    newVelocity = 1400 / newDeltaT;
    deltaV = newVelocity - oldVelocity;
    
/* print out the mathed stuff */
    Serial.print("Velocity: "); Serial.print(newVelocity); Serial.println("MPH");
    Serial.print("DeltaV: "); Serial.print(deltaV); Serial.println("MPH");
    Serial.print("Time Between Pulses: "); Serial.print(newDeltaT); Serial.println("mS"); 
    runFlag = false; // reset run flag and wait for another pulse
  } 

}