7 segment decimal point

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

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

Nico

Hello,

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

Simon

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

John

Quote:

---

Originally Posted by sstusek

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

Quote:

---

Originally Posted by sstusek

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

got it :D

Thanks

Michael

Quote:

---

Originally Posted by John_B

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?!

Quote:

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Originally Posted by kiek

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

Hi Simon,

Quote:

---

Originally Posted by sstusek

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:

Code:

---

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

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 :D

Thanks,
Simon

Hi Nico,
so if is possible dimming DP of a Display, we can dim any master card output it's right?
I would reply the DIM/BRIGHT function of MCP's korry with just two lighting levels.

regards,
V.

Hi Nico,
so if is possible dimming DP of a Display, we can dim any master card output it's right?
I would reply the DIM/BRIGHT function of MCP's korry with just two lighting levels.

regards,
V.

Hi Valerio,

Quote:

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Originally Posted by BABA767

Hi Nico,
so if is possible dimming DP of a Display, we can dim any master card output it's right?

---

Afirm.
http://www.lekseecon.nl/howto.html#dimdisplaydp

Nico

Thaanks!!:wink: