How to use this device
If the device is power on at 7am, it will trigger upon first power on, it also trigger the camera every 3 hours until 7pm, each day will capture 5 photos. You may modify the source code to suite for your own settings.
Note: This project did not use the RTC (Real Time Clock) module such as DS1307, the clock will reset to 0 sec, 0 minute, 0 hour, 01 day, 01 month, 01 year for every power on.

#include <Time.h> //include date time function such as hour(), minute(), second() 
#include <avr/sleep.h>
#include <avr/wdt.h>
const int cameraTriggerPin = 0;    // TINY45 PIN5 as output
const int cameraLEDPin = 2;       // TINY45 PIN7 as output
// Variables will change:
int ledState = LOW;             // ledState used to set the LED
long previousMillis = 0;        // will store last time LED was updated
long interval = 1000;           // interval at which to blink (milliseconds)
void setup() {
  //OSCCAL= 0x6b;
  pinMode(cameraTriggerPin, OUTPUT);  // set the digital pin as output 
   pinMode(cameraLEDPin, OUTPUT);  // set the digital pin as output 
  digitalWrite(cameraTriggerPin, LOW);
  delay(3000); //waiting camera to ready
  enterSleep();
  setTime(0,0,0,01,01,01);            //setTime(hr,min,sec,day,month,yr);   
  //cameraTrigger(); //shoot once on startup
}
void loop()
{
  unsigned long currentMillis = millis();
 
  if(currentMillis - previousMillis > interval) {
    // save the last time you blinked the LED 
    previousMillis = currentMillis;   
    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;
    // set the LED with the ledState of the variable:
    digitalWrite(cameraLEDPin, ledState);  
  }
  // if the device is turned on at 7am, then hour=0, min=0, sec=0 will be 7am
  // the device will be triggered every 3 hours until 7pm
  if (hour()==0 &amp;&amp; minute()==0 &amp;&amp; second()==0)  cameraTrigger(); //7am
  if (hour()==3 &amp;&amp; minute()==0 &amp;&amp; second()==0)  cameraTrigger(); //10am
  if (hour()==6 &amp;&amp; minute()==0 &amp;&amp; second()==0) cameraTrigger(); //1pm
  if (hour()==9 &amp;&amp; minute()==0 &amp;&amp; second()==0) cameraTrigger(); //4pm
  if (hour()==12 &amp;&amp; minute()==0 &amp;&amp; second()==0) cameraTrigger(); //7pm
}
void cameraTrigger(void)
{
    //digitalWrite(cameraLEDPin, HIGH);
    digitalWrite(cameraTriggerPin, HIGH);
    delay(600); //delay 600ms
    //digitalWrite(cameraLEDPin, LOW);
    digitalWrite(cameraTriggerPin, LOW);
}
void enterSleep(void)
{
 
  set_sleep_mode(SLEEP_MODE_IDLE);
 
  sleep_enable();
 
  sleep_mode();
 
  /** The program will continue from here. **/
 
  /* First thing to do is disable sleep. */
  sleep_disable(); 
 
}
 
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Compile the ATtiny85 micro controller
You can use ATTiny45 or ATTiny85 for this project. Here I'm using ATTiny85.
1. Run the Arduino, I'm using Arduino 0022, make sure you already install Tiny Arduino & Time library.
2. Load the pde source code.
2. Select Board from Tools menu.
3. Select ATtiny85 (internal 1 MHz clock). See picture above
4. Click on Verify icon to start compiling
5. If you are running Windows XP, the hex file is saved in Documents and Settings\Windows XP\Local Settings\Temp\buildxxxxxxxxxxxxxxxxx.tmp folder
6. Use your programmer to flash the hex file to the micro controller.

• Both ATtiny45 & ATtiny85 can use in this project
• PC817 is the most cheaper photo coupler that I can get.
• R2 & LED1 is optional, I didn't use it for my project.
• You can use 8MHz crystal & 22pf capacitors for external clock source. Here I'm using AWCR series 8MHz ceramic resonator.
• R1 value ranged from 330 ohms to 470 ohms, it use to limit the current flow through photo coupler.