CanonDSLTrigger.ino

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_DC     6
#define OLED_CS     7
#define OLED_RESET  8
Adafruit_SSD1306 display(OLED_DC, OLED_RESET, OLED_CS);

#define seconds 1000

int picCount      = 0;
int cameraPin     =  5; // use digital pin 5
int cameraPressMs = 100; // only press the button for 30ms

void setup() {
  // initialise the screen
  Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC);

  // set camera pin for output
  pinMode(cameraPin, OUTPUT);  
}

void takePic() {
  digitalWrite(cameraPin, HIGH);
  delay(cameraPressMs); 
  digitalWrite(cameraPin, LOW);
  picCount++;
}

void printPicCount() {
  display.clearDisplay();
  
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);

  display.print("pics: ");
  display.print(picCount);

  display.display();  
}

void loop() {
  printPicCount();
  takePic();
  
  delay(30 * seconds);
}