Team:UC Chile2/Arduino

//Analog reading test. Data send to serial port.

//Sensor connections
// According to pin numbers given in TSL238T datasheet.
// Pin 1 -> Ground
// Pin 2 -> Ground
// Pin 3 -> 5 Volts.
// Pin 4 -> Pin n° 2 Arduino.
//Also, a 0.1 uF capacitor would be suitable to wire between ground and 5V. The closest possible to the sensor (it reduces noise).
// Instructions down below

// Pin definition
const int lightsensor = 2;   // Light sensor port

// Variables
unsigned long pulseCount ;  // Counts pulses given by sensor

void setup()
{
  Serial.begin(9600);
  
  pinMode(lightsensor, INPUT);  
  attachInterrupt(0, add_pulse, RISING);
}

void loop()
{
    pulseCount = 0;
    delay(500);
  
  // Send value through serial port            
  Serial.print("i");

  // Instructions:
  // First, run this program. Data should be sent to Arduino's terminal. Arduino (Tools > Serial Monitor).
  // If it works ok, it should give data every half second (it will show as text in the format i1234f, meaning a 1234 value).
  // Check values given at absolute darkness and absolute lighting conditions. Write them down and add a bit of margin to the number and replace them in LINE B.
  // Now, comment LINE A and uncomment LINE B. Run the program again.
  // Now it should give values between 0 and 1023. Values are proportional to the intensity of the light source.
  // Good luck!!
  
  Serial.print(pulseCount);  // LINE  A
  //Serial.print(map(pulseCount, here_write_absolute_darkeness_value_number , here_write_absolute_light_value_number, 0, 1203));  // LINE B  
  
  Serial.println("f");
  //Serial.flush();                   
}

void add_pulse()
{
  pulseCount++;    // Increase pulse count
}