LED7SEG 0-999

[brunoflow]

counter in LED7SEG 0-999 could help me.

the program is attached thanks

[medelec35]

Hi brunoflow,
I covered 3 x 7seg here:
http://www.matrixmultimedia.com/mmforum ... 033#p31308
That may help you?

Martin

[Gary Freegard]

Hi

I have made two changes, have moved one LED to port C and have removed the 2 second delay.

The problem with using LED 7 segments is that they use at least 7 IOs just for the number (8 with decimal point) and also they have an additional connection so that only the correct display is 'enabled' when required.
Generally they share the same 7/8 IO lines but have different 'enable' lines.
i.e. If you have two 7 segments A and B you would have to do the following.

• enable A
  output A's data
  delay 10ms
  disable A
  enable B
  output B' data
  delay 10ms
  disable B

This would be constantly repeated, the delay can be adjusted to get the best display

Gary

[brunoflow]

Thanks for the help

More when I record this example the program together account led7segment they wanted a program that counts up from 0 to 999 in PORTD

[medelec35]

they wanted a program that counts up from 0 to 999 in PORTD

That will not be possible.

With 3 displays you will need 3 pins for the anodes (1 for each display) but you will also need 7 pins in total for all the cathodes is you exclude the decimal point or 8 pins if you include decimal. The cathodes (a,b,c,d,e,f,g & decimal point if used) of each display are connected in parallel. That is a total of 3 + 7 = 10 pins without decimal points or 3 + 8 = 11 with decimal points .
Since port D has a maximum of 8 pins, you will also need to use 2 or 3 pins from another port as well. Which is what Gary is saying and I totally agree with him.

Between Gary's Flowchart and my Flowchart you should have enough information to complete your own Flowchart.

If you get stuck then post your new Flowchart and we can make sure it works the way you want it to.

Martin