// Maurice Ribble 
// 4-9-2008
// http://www.glacialwanderer.com/hobbyrobotics

// This code just lets you turn a digital out pin high for a short time.
// That's all that is needed to verify the flash circuit is working.
// Press the space bar to trigger the flash.

#define CAMERA_FLASH_PIN 4

void setup()
{
  pinMode(CAMERA_FLASH_PIN, OUTPUT);
  digitalWrite(CAMERA_FLASH_PIN, LOW);
  Serial.begin(9600); // open serial
  Serial.println("Press the spacebar to trigger the flash");
}

void loop()
{
  int cmd;
  
  while (Serial.available() > 0)
  {
    int cmd = Serial.read();
      
    switch (cmd)
    {
    case ' ':
      {
        digitalWrite(CAMERA_FLASH_PIN, HIGH);
        delay(100);
        digitalWrite(CAMERA_FLASH_PIN, LOW);
        break;
      }
    default:
      {
        Serial.println("Press the spacebar to trigger the flash");
      }
    }
  }
}