How can I beep every 00:00 ?

[bianchi77]

Guys,

I created a clock using DS1307,
How can I beep it everytime it's reaching zero ?

I have created:

//turn on chime
			minute = num2str(ds1307_addr[1]);
			second = num2str(ds1307_addr[0]);
			
			if ((second =="00") && (minute =="00"))
			  {
				  beep_sound_2();
			  }

Any ideas ?
thanks

 

[alexan_e]

You can't compare a string like that, you have to check each character individually

if ((second[0] =='0') && (second[1] =='0') && (minute[0] =='0') && (minute[1] =='0'))
  {
  }

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by the way "minute" and "second" represent the address of the first character of the array , the same as "&minute[0]" and "&second[0]"

 

[Venkadesh_M]

I think the second and minute are integer or char variables they cant be a stiring because they are assigned in the above statement so
the exact code shd be

---

Code C - [expand]
1
2
3
if ((second == 0)  &&  (minute == 0))
  {
  }

---

 

[bianchi77]

like this ?
thanks

char ds1307_addr[7];
	//turn on chime
			minute = ds1307_addr[1];
			second = ds1307_addr[0];
			
			if ((second ==0) && (minute ==0))
			  {
				  beep_sound_2();
			  }
			
		}

 

[alexan_e]

I think the second and minute are integer or char variables they cant be a stiring because they are assigned in the above statement

That may be so but in the given code there is no definition of these variables and there is a num2str function, if that function doesn't return a string then why is it named like that?

minute = num2str(ds1307_addr[1]);
second = num2str(ds1307_addr[0]);

 

[Venkadesh_M]

yeah but what are you going to do in beep sound function?? If you just enabled buzzer then It will beep continuously after match 00, so add a else case to make it reset...
or do the both in the beep sound function......

- - - Updated - - -

That may be so but in the given code there is no definition of these variables and there is a num2str function, if that function doesn't return a string then why is it named like that?

I didnt look on the function names but if it is a function which returns char pointer and second and minute are char pointers then surely it will be like element checking as you mentioned, but the code shown in #4 shd work fine...