Interfacing LCD and keypad using c programming

[nur amina]

I have questions to ask..

1. I have project to implement timer in presentation which need to interface LCD and keypad with 16f873a. the range of time is between 5 min until 30 min..user will key in their needed time by using keypad and lcd will be more focus to display timer(stopwatch).

Hopefully anyone know can give me a guide. Tq.

 

[cool.man]

As far i understand is that you want to make a timer which ranges from 5-30 minutes.user will enter the required time by keypad and it will be display on lcd.
It also start the counter/timer and when ever the timer value matches with the user entered value the timer stops.Is it right?
In which phase you have a problem,interfacing keypad and lcd with microcontroller OR timer problem OR you want a complete idea.

 

[nur amina]

Hi engr.hayee..

Tq for your kindly respond...
your understanding about my program is exactly right...I need a complete idea.now for hardware part I used 16f877a..LCD data connected to Port B,Keypad connected to PortD...
the problem now i dont know how to interface this two component in the sort of programming.. and also timer




[/img]

 

[cool.man]

Which compiler you are using for programming.
If you are using CCS compiler then you can find lot of examples how to interface keypad and lcd with microcontroller at www.ccsinfo.com/forum .
You can use timer to generate interrupt after every 1sec, then increament your variable let say Sec,when sec will be greater than 59,then increament min and start sec from 0 again,when you reaches at the desired min's value then stop the counter/disable the timer.

 

[nur amina]

For your information i have done my program..but unfortunately i don't know why when i press my keypad,for any key.nothing display on my lcd..



one more question..can i use membran keypad?