Automatic school bell with PIC16F876A

Hi,Hi every body ,I would like to realize a school bell which rings at 50minutes and ring during 8 second .
Help me for programming please.

It has 8 period and the ninght for break of 30 minutes.

I am using CCS C

Are you looking to use a Real-Time-Clock module to keep the time (For if power is cut to your module)... I2c RTC's are easy to communicate with, I've got some sample code I used on an 877 to start if this is a way you might go...

Kind regards
NEAL

could you please give me the link of those sample codes?

I don't care about power cut off.

---------- Post added at 10:48 ---------- Previous post was at 10:37 ----------

see my code here below:
#include<16f876a.h> //PIC Name
#fuses HS,NOWDT
#use delay(clock=16000000)//External Oscillator Frequency
//#use fast_io(port)
#use standard_io(a)
#use standard_io(c)
void main()
{
//set_tris_a(0xff);
set_tris_c(0x00);
output_c(0x00);
while(true)
{
output_high(PIN_C2);
delay_ms(8000);//Ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//1st period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//second period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//third period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//Fourth period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(1800000);//Fourth period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//Firth period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//Sixth period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//Siventh period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//ending period 8th

}
}

Cool! That looks OK to me!
NEAL

---------- Post added at 08:51 ---------- Previous post was at 08:49 ----------

One thing,

"delay_ms(3000000);//Siventh period"

I have to use DelayBigMs() for delay values more than 255. Sometimes best to us a loop...
NEAL

#include<16f876a.h> //PIC Name
#fuses HS,NOWDT
#use delay(clock=16000000)//External Oscillator Frequency
//#use fast_io(port)
#use standard_io(a)
#use standard_io(c)
void main()
{
//set_tris_a(0xff);
set_tris_c(0x00);
output_c(0x00);
while(true)
{
output_high(PIN_C2);
delay_ms(8000);//Ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//1st period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//second period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//third period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//Fourth period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(1800000);//Fourth period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//Firth period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//Sixth period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//Siventh period

output_high(PIN_C2);
delay_ms(8000);//ring at start up during 8 seconds

output_low(PIN_C2);
delay_ms(3000000);//ending period 8th

}
}
see the code I am now using

Cool

regards
NEAL

How to use such loop for big delay??
The code given on the site the one I said I a using are not working fine.
Hope you can also show me how to use a push button for getting started and how to stop while running!
Thanks

If this was left to run over a long period of time then period would slowly move throughout the days, due to you not allowing for the 8sec bell time.

could you plz tell me by code ;meanwhile email me the code then I try with them!!

You ok now matey? I've been stuck in bed and something has made 3 ComtrendPowerline adapters in the house blow in 2 weeks, mine was today! Pain in ass!
Bridged wireless is doing the job for now..
NEAL

Hi John120,

Looking for RTC source code, here's an example:

Interfacing RTC DS1307 with PIC Microcontroller CCS Compiler

BigDog

delay_ms(2992000);// period 3000000-8000

polo-g40 said:

Are you looking to use a Real-Time-Clock module to keep the time (For if power is cut to your module)... I2c RTC's are easy to communicate with, I've got some sample code I used on an 877 to start if this is a way you might go...

Kind regards
NEAL

Click to expand...

hello mr.Neal.. could you please sent me your sample code? we are having a project using RTC for our automatic school bell.. tessajaneflores@yahoo.com. thank you very much!