Nikon Arduino Remote

gistfile1.c

// ----- C -------
	/**
	 * arduino Nikon IR remote
	 * @license	Creative commons: Attribution-Noncommercial-Share Alike 3.0 (http://creativecommons.org/licenses/by-nc-sa/3.0/)
	 * @author Aurelien ANTOINE
	 * version 1
	 * date 20081217
         *
         *
         * This version modified by Steve Hoefer September 12, 2011
         * Changes: 
         *    - Removed status light
         *    - Added pushbutton trigger
         *    Shared back to the community per the BY-NC-SA license.
         *    Retains the original BY-NC-SA License above.
	**/
	 
	#define LEDPin 14
	#define ButtonPin 15
	#define FREQ 38400  // IR frequence
	 
	//shutter sequence (on,off,on,off ... in microsecond)
	unsigned long sequence[] = {2000,27830,390,1580,410,3580,400,63200,2000,27830,390,1580,410,3580,400,0};
	int seq_l;
	 
	//oscd is a delay in microsecond used at each oscillation.
	int oscd;
	 
	void oscillate(int pin, unsigned long n, int shine){
		int ir_status=0;
		while(n>0){
			n--;
			delayMicroseconds(oscd);
			ir_status  =  !ir_status; 
			digitalWrite(pin,  ir_status && shine);  
		}
	}
	 
	void snap(){
		int i;
		for(i=0;i<seq_l;i++){
			oscillate(LEDPin, sequence[i], i%2==0);
		}
		digitalWrite(LEDPin,  0);
	}
	 
	void setup() {
                pinMode(ButtonPin, INPUT);   
                
		int min=1, max=100, i;
		int last_oscd=0;
		unsigned long before, intervalle;
		oscd=max;
	 
		seq_l = sizeof(sequence)/sizeof(unsigned long);
	 
		pinMode(LEDPin, OUTPUT);
	 
		//this "while" will process the best "oscd"
		while(last_oscd!=oscd){
			last_oscd=oscd;
			oscd=(min+max)>>1;
	 
			before=millis();
			oscillate(LEDPin, FREQ, 1);
			intervalle=millis()-before;
	 
			if(intervalle >= 1000) max=oscd;
			else min=oscd;
		}
	 
		//rewrite the sequence array, we replace all values in microsecond by the number of oscillation
		for(i=0;i<seq_l;i++){
			sequence[i] = (sequence[i] * FREQ) / (intervalle * 1000);
		}
	}
	 
	 
	void loop() {	
                if (digitalRead(ButtonPin)==HIGH){
                  snap();    // take a photo when button pressed.
		}
                delay(100);
	 
	}