automatic device turn off and on

[aneeshere]

guys,

I want to automatically turn on a device(example led) everyday morning 8.00 to 9.00 and keep it on for the rest of the day for all days.
I designed a clock using ds1307 and pic16f877a and lcd display.
now how do i do the rest?
please help me..
thanks

 

[horace1]

if you read the ds1307 RTC in a loop, turn on the device when the time reaches 8:00 and off at 9:00

 

[aneeshere]

how do i check the time through program. i already tried it in proteus but got no response.i tried to do it when the minute becomes 11 just for simulation purposes but it is not responding.

i tried while(minute == 11)
{
porta.f0=0;
}

also tried
while (time[3] == 1 && time[4] ==1)
{
porta.f0=0;
}

did not work

 

[horace1]

if you wish to switch on a 8:00 and off at 9:00 all you need to do it test if the hour is 8 if so switch on else switch off
assume functions to read the RTC etc code would be something like

  while(1)
    {
     int hour=readRTC();
     if(hour==8) switchON();
     else      switchOFF();
    }

don't forget the ds1307 stores its data in BCD you have to convert it to decimal

have a look at
DS1307 RTC tutorial

 

[aneeshere]

ill paste my program here.

unsigned short read_ds1307(unsigned short address );
void write_ds1307(unsigned short address,unsigned short w_data);
unsigned short sec;
unsigned short minute;
unsigned short hour;
unsigned short day;
unsigned short date;
unsigned short month;
unsigned short year;
unsigned short data;
char time[9];
char ddate[11];

unsigned char BCD2UpperCh(unsigned char bcd);
unsigned char BCD2LowerCh(unsigned char bcd);

void main(){

I2C_Init(100000);
PORTB = 0;
TRISB = 0;
PORTA = 0;
TRISA = 0;
TRISC = 0xFF;
Lcd_Init(&PORTB);
Lcd_Cmd(Lcd_CLEAR);
Lcd_Cmd(Lcd_CURSOR_OFF);
Lcd_Out(1, 1, "TIME:");
Lcd_Out(2, 1, "DATE:");

//Set Time
write_ds1307(0,0x80); //Reset second to 0 sec. and stop Oscillator
write_ds1307(1,0x10); //write min 10
write_ds1307(2,0x01); //write hour 01
write_ds1307(3,0x02); //write day of week 2:Monday
write_ds1307(4,0x05); // write date 05
write_ds1307(5,0x01); // write month 1
write_ds1307(6,0x09); // write year 9
write_ds1307(7,0x10); //SQWE output at 1 Hz
write_ds1307(0,0x00); //Reset second to 0 sec. and start Oscillator

while(1)
{
sec=read_ds1307(0); // read second
minute=read_ds1307(1); // read minute
hour=read_ds1307(2); // read hour
day=read_ds1307(3); // read day
date=read_ds1307(4); // read date
month=read_ds1307(5); // read month
year=read_ds1307(6); // read year

time[0] = BCD2UpperCh(hour);
time[1] = BCD2LowerCh(hour);
time[2] = ':';
time[3] = BCD2UpperCh(minute);
time[4] = BCD2LowerCh(minute);
time[5] = ':';
time[6] = BCD2UpperCh(sec);
time[7] = BCD2LowerCh(sec);
time[8] = '\0';

ddate[0] = BCD2UpperCh(date);
ddate[1] = BCD2LowerCh(date);
ddate[2] ='/';
ddate[3] = BCD2UpperCh(month);
ddate[4] = BCD2LowerCh(month);
ddate[5] ='/';
ddate[6] = '2';
ddate[7] = '0';
ddate[8] = BCD2UpperCh(year);
ddate[9] = BCD2LowerCh(year);
ddate[10] = '\0';

Lcd_Out(1,6,time);
Lcd_Out(2,6,ddate);
Delay_ms(50);

while(minute == 11)
{
PORTA.F1=1;
}
}
}

unsigned short read_ds1307(unsigned short address)
{
I2C_Start();
I2C_Wr(0xd0);
I2C_Wr(address);
I2C_Repeated_Start();
I2C_Wr(0xd1);
data=I2C_Rd(0);
I2C_Stop();
return(data);
}

unsigned char BCD2UpperCh(unsigned char bcd)
{
return ((bcd >> 4) + '0');
}

unsigned char BCD2LowerCh(unsigned char bcd)
{
return ((bcd & 0x0F) + '0');
}
void write_ds1307(unsigned short address,unsigned short w_data)
{
I2C_Start();
I2C_Wr(0xD0);
I2C_Wr(address);
I2C_Wr(w_data);
I2C_Stop();
}