#include <TimerOne.h>
#define led 9

void setup(void)
{  
  pinMode(led, OUTPUT);
  Timer1.initialize(150000);
  Timer1.attachInterrupt(blinkLED);
  Serial.begin(9600);
}

int ledState = LOW;
volatile unsigned long blinkCount = 0; //use volatile for shared variables

void blinkLED(void)
{
  Serial.println("step 99...");
  if (ledState == LOW) {
    ledState = HIGH;
    blinkCount = blinkCount + 1;
  } else {
    ledState = LOW;
  }
  digitalWrite(led, ledState);
}

void loop(void)
{
  Serial.println("step 1...");
  delay(100);

  unsigned long blinkCopy;  // holds a copy of the blinkCount
  Serial.println("step 2...");
  delay(100);

  noInterrupts();

  Serial.println("step 3...");
  delay(100);

  blinkCopy = blinkCount;

  Serial.println("step 4...");
  delay(100);
  interrupts();

  Serial.println("step 5...");
  delay(100);
  Serial.print("blinkCount = ");
  Serial.println(blinkCopy);
  Serial.println("step 6...");
  delay(100);

  Serial.println("step 7...");
  delay(100);
  }