Cuckoo Clock Project

My Cuckoo Clock Project uses an Arduino Uno, DS1307 RTC, 16x2 LCD and a couple of RC servo's. Everything has been breadboarded and all the parts are working individually. The LCD is functioning with Date and Time being displayed properly, the 2 servos that I'm using for the bird motion and operation of the twin bellows are performing as they should. But now I'm stuck trying to understand the most important part and that is how to program for an hourly event ( the Cuckoo and Sound ). I thought this part would be easy, and all I would need to do is read the current minute and second and when they were both zero start the servo routine using the hour value. But I'm having a problem finding a suitable example of this type of event to learn from. Any suggestions where I might look? For a 79 year old this project has been a lot of fun so far, and only wish I would have started learning C about 30 years ago.

I would start with the RTC library, look at how it gets the time (from some examples). Once you have the time, the rest surely follows.

Hopefully this gives you an idea!

const unsigned long ONE_SECOND  = 16UL;
const unsigned long ONE_MINUTE  = 60 * ONE_SECOND;
const unsigned long ONE_HOUR    = 60 * ONE_MINUTE;

unsigned long msTarget;

unsigned long hms2millisecs(uint8_t const hours, uint8_t const minutes, uint8_t const seconds)
    return ((hours * ONE_HOUR) + (minutes * ONE_MINUTE) + (seconds * ONE_SECOND));

void millisecs2hms(unsigned long milliseconds, uint8_t* hours, uint8_t* minutes, uint8_t* seconds)
    uint8_t h = milliseconds / ONE_HOUR;        milliseconds -= h * ONE_HOUR;       *hours      = h;
    uint8_t m = milliseconds / ONE_MINUTE;      milliseconds -= m * ONE_MINUTE;     *minutes    = m;
    uint8_t s = milliseconds / ONE_SECOND;      milliseconds -= s * ONE_SECOND;     *seconds    = s;

void loop()
    uint8_t     hours;
    uint8_t     minutes;
    uint8_t     seconds;
    long        remaining = msTarget - millis();
    millisecs2hms(remaining, &hours, &minutes, &seconds);


    if ( remaining <= 0 )
        // we've reached zero time
        while (true)
        {    }

void setup()
    msTarget = millis() + hms2millisecs(1, 50, 54); // hours, minutes, seconds

He's got a clock chip.

"DS1307 RTC" yes I see but just because he has doesn't mean it needs to be used.

If I had the chip to hand, and I wanted the cuckoo to come out on the hour, personally I would be using it. :P

School projects every dollar counts and not every student has that extra dollar, of course if the accuracy is an absolute must I'd probably agree with you.

Absolutely. But read this:

For a 79 year old this project has been a lot of fun so far, and only wish I would have started learning C about 30 years ago.

Off the top of my head couldn’t you just compare the current hour to the last hour and if it has changed then move the bird? Something like this:

if(hour > lastHour){
//move bird
lastHour = hour

The TimeAlarms library makes using repeating events very simple

I don't think I understand the question. If the OP can read the RTC and display the time on the LCD then he already has hours, minutes and seconds?

I found an example for what I was looking for in a sketch written for a Radio Shack LED Grandfather Clock project that I found referenced while browsing through the Arduino Forum.

They were using the same DS1307RTC.h library as I was so I tried this - if (minute(time) == 0) { Serial.println("On the hour"); } I ran my sketch and watched the serial monitor as it came to the hour and the message was seen each time. So I'm half way there. Now I'm trying to understand the process I need to write a routine that using the hour value will move my servo "x" number of repititions. In MS Basic I learned to use subroutines, what do you use in "C" ? I was really good at writing spaghetti code which I'm trying to avoid here.

In C a subroutine is called a function. Loop and setup are functions. Lloyddean's example above has a number of examples, e.g. millisecs2hms.

if (minute (time) == 0) 
  Serial.println ("On the hour"); 

Yes but that will print "on the hour" all that first minute.

Better would be:

if (hour (time) != previousHour) 
  Serial.println ("On the hour"); 
  previousHour = hour (time);

That only does it once.

And then incorporate a for loop:

for i=1 to hour move servo one way move servo back again next i

Thanks all for the suggestions. It seems rather simple now, looking at the comments.