How to display dot on 7-seg , 4 digit

[chai98a]

we try to used 7-seg 4 digit.
but we don't know how to display dot (Ex. 45.46)

[ardhuru]

Hi,

Think of the display as a 8 segment display, where the eighth 'segment' is the decimal. Keep this 'segment' off in all the digits, except for the one where you want the decimal to show.

Regards,

Anand

[chai98a]

Need more informatiom
here is may code :for display 7-seg

For i = 0 To 3 ' Loop through 4 digits
n = Value Dig i ' Get digit to display
Gosub display1 ' Display the value
NEXT I
goto mainloop

display1:
Digits = $ff ' All digits off to prevent ghosting

' Convert binary number in n to segments for LED
' COM ANODE 1234567890

Lookup n, [$3F,$06, $5B, $4F, $66, $6D, $7D, $07, $7F, $6F], Segments

' Set digit pin i to 0 (on) and the rest of the pins to 1 (off)

Digits = ~Dcd i

Return

[paul borgmeier]

Your code is not complete! You have a nice lookup table but you do not use the outcome from the table? Where do you use the variable Segments? Is Digits the name of your port? (which you imply when you set it = $FF at one point)

Also, the way you have it (Digits =~DCD i)
Digits can only be

11111110
11111101
11111011
11110111

Although it is late here, your code makes no sense to me

However, if Digits does control the port, it looks like you can turn your DP on by issuing this
Digits.7 = 0
(provided the wire or trace from the DP goes to pin 7 of your port).

Post complete code for better shot at guessing what you are trying to do.

[paul borgmeier]

ok it's not 4am (it's 8:15am)

i see what the dcd command is doing (common anode as you noted).

For the digit you want to have the dp on try

Sements.7 = 0 (provided your PORT.7 pin is tied to the DP via wire or trace


Good Luck

[paul borgmeier]

One more time - after a proper days rest, I have no clue what your code does; it looks to me to be partly written for common anode displays ($3F=1) and partly written for common cathode displays (Digits = ~DCD i). The Segments.7=0 should work (right after your lookup table) for the digit you want the DP to be on. Please post full code or schematic for more definite help.
Again, Good Luck