hellllllllllllllllp about 7 segment

D

dondeso

New Member

• Jul 14, 2011

• #1

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

 

P

pixman

Member

• Jul 14, 2011

• #2

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

 

D

dondeso

New Member

• Jul 14, 2011

• #3

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

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Jul 14, 2011

• #4

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

 

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D

dondeso

New Member

• Jul 14, 2011

• #5

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

User Extraordinaire

Forum Supporter

Most Helpful Member

• Jul 14, 2011

• #6

You need a simple lookup table ...

Code:

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

to represent each number

 

D

dondeso

New Member

• Jul 14, 2011

• #7

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

User Extraordinaire

Forum Supporter

Most Helpful Member

• Jul 14, 2011

• #8

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

Code:

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

 

Last edited: Jul 14, 2011

D

dondeso

New Member

• Jul 14, 2011

• #9

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

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Jul 14, 2011

• #10

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

 

C

colin mac

New Member

• Jul 14, 2011

• #11

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?