skmdmasud
Member
AT89C51 Alarm clock to 24hr repeating ON Off Timer
I finally thought about making a timer using micro controller. I know few things about computer software programming which is a bit related to C for micro controller so I am giving it a go..
I am trying to modify the following code which is a simple alarm clock to on and off timer
View attachment 64927
original CODE:
circuit modification will be simple, i will just put a relay instead of the buzzer and another switch for alarm2 in pin 6 most probably.
coding part - i need help. i am assuming "alarm as timer on" and "alarm2 as timer off" and did some additions like following:
------------------------------------------------------
-------------------------------------------------------------------------------
I know there are lots of thing missing and wrong as well. Please help to correct the code.
code source: **broken link removed**
Thanks and Regards
I finally thought about making a timer using micro controller. I know few things about computer software programming which is a bit related to C for micro controller so I am giving it a go..
I am trying to modify the following code which is a simple alarm clock to on and off timer
View attachment 64927
original CODE:
Code:
//Program to make a digital clock with time and alaram setting function
#include<reg51.h>
#define port P1
#define cont_port P3
#define dataport P2 //Data port for LCD
#define m_sec 10
sbit rs = cont_port^0;
sbit rw = cont_port^1;
sbit en = cont_port^6;
sbit dig_hr1=port^0;
sbit dig_min1=port^1;
sbit start=port^2;
sbit am_pm=port^3;
sbit alarm_set=port^4;
sbit alarm=port^7;
int hr ,hr1=0,alarm_hr=0;
int min,min1=0,alarm_min=0;
int sec,sec1=0,dig_am_pm=0,alarm_am_pm=0;
void delay(unsigned int msec) // Time delay function
{
int i,j ;
for(i=0;i<msec;i++)
for(j=0;j<1275;j++);
}
void lcd_cmd(unsigned char item) //Function to send command to LCD
{
dataport = item;
rs= 0;
rw=0;
en=1;
delay(1);
en=0;
return;
}
void lcd_data(unsigned char item) // Function to send data to LCD
{
dataport = item;
rs= 1;
rw=0;
en=1;
delay(1);
en=0;
return;
}
void lcd_data_string(unsigned char *str) // Function to send string to LCD
{
int i=0;
while(str[i]!='\0')
{
lcd_data(str[i]);
i++;
delay(1);
}
return;
}
lcd_data_int(int time_val) // Function to send number to LCD
{
int int_amt;
int_amt=time_val/10;
lcd_data(int_amt+48);
int_amt=time_val%10;
lcd_data(int_amt+48);
}
void lcd(unsigned char str1[10])
{
lcd_cmd(0x38);
lcd_cmd(0x0e);
delay(1);
lcd_data_string(str1);
}
void set_hr1() // // Function to set hours digit of clock
{
hr1++;
if(hr1>11)
hr1=0;
lcd_cmd(0xc3);
lcd_data_int(hr1);
lcd_data(':');
}
void set_min1() // Function to set minutes digit of clock
{
min1++;
if(min1>59)
min1=0;
lcd_cmd(0xc6);
lcd_data_int(min1);
}
void set_alarm_hr1() // Function to set hours digit of alarm
{
alarm_hr++;
if(alarm_hr>11)
alarm_hr=0;
lcd_cmd(0xc3);
lcd_data_int(alarm_hr);
lcd_data(':');
}
void set_alarm_min1() // Function to set minutes digit of Alarm
{
alarm_min++;
if(alarm_min>59)
alarm_min=0;
lcd_cmd(0xc6);
lcd_data_int(alarm_min);
}
void alarm_check() // Function to check alarm
{
if(hr==alarm_hr)
{
if(min==alarm_min)
{
if(dig_am_pm==alarm_am_pm)
{
alarm=1;
lcd_cmd(0xc5);
lcd("ALARM");
delay(10);
alarm = 0;
}
}
}
}
void main()
{
int k;
start=1;
dig_hr1=1;
dig_min1=1;
alarm_set=1;
alarm=0;
lcd_cmd(0x83);
lcd("SET ALARM");
lcd_cmd(0xc3);
lcd_data_int(hr1);
lcd_data(':');
lcd_data_int(min1);
while(alarm_set==0)
{
delay(10);
if(dig_hr1==0)
set_alarm_hr1();
if(dig_min1==0)
set_alarm_min1();
}
if(am_pm==0)
{
lcd_cmd(0xc8);
lcd_data_string("am");
alarm_am_pm=0;
}
if(am_pm==1)
{
lcd_cmd(0xc8);
lcd_data_string("pm");
alarm_am_pm=1;
}
delay(200);
lcd_cmd(0x01);
lcd_cmd(0x83);
lcd("SET TIMING");
lcd_cmd(0xc3);
lcd_data_int(hr1);
lcd_data(':');
lcd_data_int(min1);
while(start==0)
{
delay(10);
if(dig_hr1==0)
set_hr1();
if(dig_min1==0)
set_min1();
}
if(am_pm==0)
{
lcd_cmd(0xc8);
lcd_data_string("am");
dig_am_pm=0;
}
if(am_pm==1)
{
lcd_cmd(0xc8);
lcd_data_string("pm");
dig_am_pm=1;
}
delay(200);
lcd_cmd(0x01);
while(1)
{
for(k=0;k<2;k++)
{
for(hr=hr1;hr<12;hr++)
{
for(min=min1;min<60;min++)
{
for(sec=0;sec<60;sec++)
{
lcd_cmd(0x82);
delay(1);
lcd_data_int(hr);
lcd_data(':');
lcd_data_int(min);
lcd_data(':');
lcd_data_int(sec);
if(dig_am_pm==0)
{
lcd("am");
}
else
{
lcd("pm");
}
delay(80);
alarm_check();
lcd_data_string(" ");
}
}
min1=0;
}
if(dig_am_pm==0)
dig_am_pm=1;
else
dig_am_pm=0;
hr1=0;
}
}
}
circuit modification will be simple, i will just put a relay instead of the buzzer and another switch for alarm2 in pin 6 most probably.
coding part - i need help. i am assuming "alarm as timer on" and "alarm2 as timer off" and did some additions like following:
------------------------------------------------------
Code:
sbit alarm_set2=port^5; //----port 5---
//variable declaration
int alarm2_hr=0;
int alarm2_min=0;
int alarm2_am_pm=0;
//---------------------------
void set_alarm2_hr() // Function to set hours digit of alarm2 or off time for timer
{
alarm2_hr++;
if(alarm_hr2>11)
alarm2_hr=0;
lcd_cmd(0xc3); -----what does this lines do
lcd_data_int(alarm2_hr);
lcd_data(':');
}
void set_alarm2_min() // Function to set minutes digit of Alarm2
{
alarm2_min++;
if(alarm2_min>59)
alarm2_min=0;
lcd_cmd(0xc6);
lcd_data_int(alarm2_min);
}
void alarm2_check() // Function to check alarm2
{
if(hr==alarm2_hr)
{
if(min==alarm2_min)
{
if(dig_am_pm==alarm2_am_pm)
{
alarm2=1;
lcd_cmd(0xc5); //---------??
lcd("OFF Time");
delay(10); //-----some code to keep in a fixed state----??
alarm2 = 0; //may be this will be 1
}
}
}
---------------------------
inside void main
alarm2_set=1;
alarm2=0;
lcd_cmd(0x83); -------??
lcd("SET ALARM2")
//--------at the end of the code it will check both alarm
alarm_check();
alarm2_check();
I know there are lots of thing missing and wrong as well. Please help to correct the code.
code source: **broken link removed**
Thanks and Regards
Last edited: