16F690 and i2c Com

[ross246]

So I have the theory correct the strange thing is when i set B.4 and B.5 to high and B.6 to low, it displays on the 3rd segment with correct brightness. But when I try set B.4 or B.5 low and the others high, those 2 segments (1st and 2nd) appear dim. Can only think it's my code I will keep reading and trying. Thanks for the response

[HenrikOlsson]

Hi,
Yes, the theory is correct but 500ms per digit seems a bit slow, it'll definitely be flickering... ;-)

I don't mean to step on any toes or anything but you DO have resistors in series with LED segments don't you? Don't connect them directly to the PIC. If you don't have any resistors you may have toasted some of the segments due to too much current.... And don't forget the driver/buffer for the common cathodes, don't try to sink all that current thru the PICs I/O's.

/Henrik.

[ross246]

Yea I had it at 500ms just to see if I could get each digit to display in sequence (which doesn't work). I have resistors in series with each segment but I will be honest I dont know what you mean by driver/buffer? I thought if it was a common ANODE you could use a transistor but as I said earlier my electronics is touch and go and I'm not sure how I would go about hooking that up

[ross246]

I neatened up my code and it solved the problem why exactly it solved the problem I am not sure, but im glad it did

TRISC = %00000000       
TRISB = %00000000

ADCON1=%00000111
ANSELH=0
ANSEL=0
CM1CON0=0
CM2CON0=0


       
loop:   
       GOSUB selseg1
       gosub disno1
       pause 5
       GOSUB selseg2
       gosub disno2
       pause 5
       GOSUB selseg3
       gosub disno3
       pause 5
goto loop  

Selseg1:
     portb = %01111111
     RETURN

Selseg2:
     portb = %11011111
     Return
     
Selseg3:
     portb = %10111111
     RETURN

DisNo1:
  PORTC = %01000010
  Return
     
DisNo2:
     PORTC = %01101101     
     return
     
DisNo3:
     PORTC= %00111101
      return
      
 DisNo4:
     PORTC = %00011110     
     return
     
DisNo5:
     PORTC = %00111011 
     return
     
 DisNo6:
     PORTC = %01111010     
     return
     
  DisNo7: 
    PORTC = %00010101      
     return
     
 DisNo8:
     PORTC = %01111111    
     return
     
 DisNo9: 
     PORTC = %00111111             
     return        
End