photocell light meter

int sensorPin = 4; // 220 or 1k resistor connected to this pin
long result = 0;
void setup() // run once, when the sketch starts
{
Serial.begin(9600);
Serial.println("start"); // a personal quirk
}

void loop() // run over and over again
{
  if (RCtime(sensorPin)>100){
    Serial.println("there is bright light");
    Serial.println(RCtime(sensorPin));
  }
Serial.println( RCtime(sensorPin) );
delay(100);
}
long RCtime(int sensPin){
long result = 0;
pinMode(sensPin, OUTPUT); // make pin OUTPUT
digitalWrite(sensPin, HIGH); // make pin HIGH to discharge capacitor - study the schematic
delay(1); // wait a ms to make sure cap is discharged
pinMode(sensPin, INPUT); // turn pin into an input and time till pin goes low
digitalWrite(sensPin, LOW); // turn pullups off - or it won't work
while(digitalRead(sensPin)){ // wait for pin to go low
result++;
}
return result; // report results
}