7 segment decimal point

[bindook]

Hi ,
i'm trying to hardwire the decimal point , how can I do this using the master card or display card???


Have had a look at a forumn post on opencockpits but it didn't make any sense.



Thanks

Michael

[kiek]

Connect the DP pin (of the 7-segment digit) -with a wire- to an output of your Master card (without a resistor).

Nico

[sstusek]

Hello,

Is there a way to dimm dot point together with 7-segment digits? While I dimm digits, dots stay bright!
Thanks.

Simon

[John_B]

if you can settle a fixed "dimness" simply pop in a resistor !

John

[kiek]

Hello,

Is there a way to dimm dot point together with 7-segment digits? While I dimm digits, dots stay bright!
Thanks.

Simon

You can do that in software in SIOC, by switching the output that controls the DP on/off frequently. Pulse width modulation as it is called.
Nico

[kiek]

Hello,

Is there a way to dimm dot point together with 7-segment digits? While I dimm digits, dots stay bright!
Thanks.

Simon

You can do that in software in SIOC, by switching the output that controls the DP on/off frequently. Pulse width modulation as it is called.
Nico

[bindook]

got it

Thanks

Michael

[sstusek]

if you can settle a fixed "dimness" simply pop in a resistor !
John

Hi,
John, that is exactly how I solved the dimming problem at the moment but I do not like it that much!
I have read many manuals on how to dimm OC 7 segment displays and dot point but none actually worked for DP?!

You can do that in software in SIOC, by switching the output that controls the DP on/off frequently. Pulse width modulation as it is called.
Nico

I am interested in Nico's approach. It makes sense to use PWM, I just don´t have the idea how to start programing that in SIOC? Is possible to learn more about PWM in SIOC?

Thank you,
Simon

[kiek]

Hi Simon,

I am interested in Nico's approach. It makes sense to use PWM, I just don´t have the idea how to start programing that in SIOC? Is possible to learn more about PWM in SIOC?

I have not tested it yet, but basically it goes like this:

Var 0 Value 0
{
  &dimcontrol = 0
  &dimcontrol = TIMER 1 0 4  
// 4 means 40 msec 
}


Var 1 name dimvalue value 3   // values between 1 and 4:   1=25%, 2=50%, 3=75%, 4=100%
Var 2 name DPvalue            // 0 or 1 


Var 10 name dimcontrol Link SUBRUTINE
{
// is called 25 times per second
  &DP = &DPvalue
  IF &DPvalue == 1
  {
    IF &dimvalue <= 3 // EDIT changed 4 into 3!
    {
      IF &dimvalue >= 1
      {
        &DP = DELAY 0 &dimvalue  // determines the width of the pulse (PWM)
      }
    } 
  }
}


Var 100 name DP Link IOCARD_OUT Output 78

So there are three dimming levels. We could program more but then the frequency would go below 25Hz and flickering would occur.
After I have tested it, to make sure it works fine, I'll add it to my collection of example SIOC scripts at my Howto SIOC page.

Nico

[sstusek]

Hi Nico,

Thank you for this PWM example code, I will try it.
I basically learned to "sioc" on your Howto SIOC page. It was and still is a great help, it´s actually the Rosetta Stone of SIOC

Thanks,
Simon