controlling array of leds from hex keypad

[chaudhryali55]

Hi!

M newbie to this microcontroler programming .I need a help of how to control an array of led ..it is in programmer board,and m using mplab hi tech c compiler and ponyprog programm to burn it into the pic16f877


so all i need is that how can i write a c program to switch between leds that i want .for example from the hex keypad i press 1.when 1 is pressed the 1st led should be on and other leds should remain off..hex-keypad is included in my project.only i want to know how control individual led on the board..means the c programm ...thanks in advance

 

[shreyas_patel21]

hi chaudhryali55,

you need to write the program that checks for the raws and column for the hex keypad

first u can check the raw
when raw is known you can check for column by knowing that the pressed key will be detected

---------- Post added at 12:54 ---------- Previous post was at 11:17 ----------

here is the sample code for hex keypad the code may not be exact but you can get idea through it


#define r1 PORTBbits.RB0 //raws of hex keypad
#define r2 PORTBbits.RB1
#define r3 PORTBbits.RB2
#define r4 PORTBbits.RB3

#define c1 PORTBbits.RB4 //columns
#define c2 PORTBbits.RB5
#define c3 PORTBbits.RB6
#define c4 PORTBbits.RB7

#define led1 PORTAbits.RA0
#define led2 PORTAbits.RA1
#define led3 PORTAbits.RA2
#define led4 PORTAbits.RA3
#define led5 PORTAbits.RA4
#define led6 PORTAbits.RA6



void main()
{
unsigned int key=0;
while(1)
{

if (r1==1) // checking raws
{
if(c1==1) //checking columns
key=1;
else if(c2==1)
key=2;
else if(c3==1)
key=3;
else
key=4;
}
else if(r2==1)
{
if(c1==1)
key=5;
else if(c2==1)
key=6;
else if(c3==1)
key=7;
else
key=8;
}
else if(r3==1)
{
if(c1==1)
key=9;
else if(c2==1)
key=0;
else if(c3==1)
key=a;
else
key=b;
}
else
{
if(c1==1)
key=c;
else if(c2==1)
key=d;
else if(c3==1)
key=e;
else
key=f;
switch(key) //displaying leds according to hex keypad
{
case1:led1=1;led2=0;led3=0;led4=0;led5=0;led6=0;
case1:led1=0;led2=1;led3=0;led4=0;led5=0;led6=0;
case1:led1=0;led2=0;led3=1;led4=0;led5=0;led6=0;
case1:led1=0;led2=0;led3=0;led4=1;led5=0;led6=0;
case1:led1=0;led2=0;led3=0;led4=0;led5=1;led6=0;
case1:led1=0;led2=0;led3=0;led4=0;led5=0;led6=1;
}
}
}

 

[chaudhryali55]

thnks sheryas it really help me ..but can we implement it this code ? and other question i have that does the programming of lcd differs for diffrent manufactures? and wat it his best and most used programmer board ?

 

[shreyas_patel21]

yes chaudhryali,
the code can be easily implemented with some changes.
and about the programmer board, i am using PICKit3 its easy to use.

 

[chaudhryali55]

thanks sheryas ..m using mikro c Pro compiler along with pic simulator ide it is really going well with me...thanks again it really helped me...