hellllllllllllllllp about 7 segment

[dondeso]

i want connect 7 segment directly to pic16f877a with out decoder any one help

 

[pixman]

Have a look at Nigel's site it has hardware layout with tutorials for them.

 

[dondeso]

i will check it now but if u have any idea tell me

 

[Ian Rogers]

Just one!!! Its easy... two, three or four just ground through a separate port

 

[dondeso]

im soooooooooo thnkx for u but can u tell methe code to operate by microbasic prog
i used it by decoder but there problem this code
program hh

' Declarations section
dim i as byte
main:
trisd=0
portd=0
i=0
for i = 0 to 9

portd.i=1

delay_ms(500)
next i
end.

 

[Ian Rogers]

You need a simple lookup table ...

  byte CONST LED_MAP[10] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

to represent each number

 

[dondeso]

iam sorry but can u post the code that make the 7 segment to operate as 1 2 3 4 5 6 7

 

[Ian Rogers]

I don't use micro basic but the lookup usually looks like this:

sub send( index as word)
   character = lookup(0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f), index
   PORTD = character
end sub

index = character to display
Microbasic's lookup will be different

 

[dondeso]

thnkxxxxxxxx a lot but do u know any one use micro basic to help me ?

 

[Ian Rogers]

Nope! I use oshonsoft basic (if I need ) mostly C.

 

[colin mac]

Someone will help you if you show some interest. So far you've only shown you need the solution and that you don't care how it works. The circuit diagram was posted for you.

Do you know how a 7-segment display works?
Do you know how to write a value to a port?