[SOLVED] designing an alarm clock circuit

Status
Not open for further replies.
Dear sir I made snubber ckt & connect.Also P2.1 connected to led (which was floating) then circuit works,bell rings stops & clock does not stop.Problom have solved.But at the time of ringig minute digit changed for a second & reset to normal time.(This is not a serious problom as earlier).
 

you mean that your rtc not running in the minutes and in just seconds during bell is ON.
 

dear sir,I am using delay function for bell ringing as follow.
Code: 
void alarm_bell_HI()
{
Lcd8_Command(0x01);

	Lcd8_Display(0xc0,"Bell ringing.. ",14);

rly=0;
 Delay(65000);Delay(65000);
 Delay(65000);Delay(65000);

rly=1;
		Lcd8_Command(0x01);


}
As the bell stops ringing then clock stop.(then I off & ON power then current normal time will display)

When I add a Delay after bell-stop as follow

Code: 
void alarm_bell_HI()
{
Lcd8_Command(0x01);

	Lcd8_Display(0xc0,"Bell ringing.. ",14);

rly=0;
 Delay(65000);Delay(65000);
 Delay(65000);Delay(65000);

rly=1;
		Lcd8_Command(0x01);

 Delay(65000);  ///  
 Delay(65000);


}

Then clock did not stop.I think problom solved temporarily solved.But after stoping a bell some error are theire.
 

Dear all,
Above problem have solved but one thing I observed.when i switch power on then some error reading shown on led display for second & clock starts.& sometimes when electricity gone & come then timer does not start normally.(schematic is given on post 55 on this thread)
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…