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Offline xavierTopic starter
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« on: February 06, 2015, 01:00:12 pm »
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Some time ago while detecting I found the remains of what seems to be an MP3 player and removed the 4 x 7 Segment display that was on the board. I found that this display had a total of 35 LED's in it but only has 7 connection pins. Today I stumbled on this display again and decided to decipher the pin-out, I did not bother to note the Play, Pause, USB, SD FM and MP3 LED's, here is what I found.

what I would like to know is what code dose one need to use to drive the display? could it be binary ? Just to clarify things a bit, (7 segment 1) segment A pin 2 is Neg and pin 1 is Pos and segment F pin 1 is Neg and pin 2 is Pos. By doing it like this they can control all 35 LED's with just 7 connection pins. (very clever indeed)
 

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« Reply #1 on: February 06, 2015, 02:33:36 pm »
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Most likely it is I2C or SPI serial communication. Beyond that, you'll have to guess at the code to control it.

Does it have any kind of part number on it at all?

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« Reply #2 on: February 06, 2015, 02:37:47 pm »
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  Yep, my bet is it had a BC code Interpreter IC  .   You can mate it to a EProm and make a cool wild Blinky Light out of it.

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« Reply #3 on: February 06, 2015, 07:04:30 pm »
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Maybe just a cmos BCD decoder driver for led. Did you try to light up any segments?

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« Reply #4 on: February 06, 2015, 09:34:55 pm »
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Quote:Posted by GoldDigger1950
Does it have any kind of part number on it at all?

Yes it dose, KM 2408 but there is nothing on the net about it so I think that it was custom made for the manufacturer.

This is the code that controls a single digit, (used in FlowCode) my guess is that if I manipulate this code I'll be able to control it. I just want to let you know that it's purely out of curiosity that I'm looking at how to make this 7 segment work so I'll play around with it for a while, you just never know what may come out of it.

 MX_UINT8 cSegmentValue = %a_SegmentArray[Value % 10];

   if (DecimalPoint)
      cSegmentValue = cSegmentValue & 0x7F;         //Clear decimal point bit

   //display the digit
    #if (%a_COM_TYPE == 1)                  //Common Anode - Low = on, High = off

      if (cSegmentValue & 0x01)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN0);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN0);
      }

      if (cSegmentValue & 0x02)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN1);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN1);
      }

      if (cSegmentValue & 0x04)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN2);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN2);
      }

      if (cSegmentValue & 0x08)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN3);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN3);
      }

      if (cSegmentValue & 0x10)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN4);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN4);
      }

      if (cSegmentValue & 0x20)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN5);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN5);
      }

      if (cSegmentValue & 0x40)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN6);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN6);
      }

      if (cSegmentValue & 0x80)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN7);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN7);
      }

      FC_CAL_Bit_High_DDR(%a_COM_PORT, %a_COM_TRIS, %a_COM_PIN);

#endif

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« Reply #5 on: February 07, 2015, 02:58:18 am »
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Does your code do anything to the display?

Posted on: February 07, 2015, 10:40:10 am
Inside of the poured epoxy you might be able to see a chip and read the part number. This is a common driver for those guys.

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Posted on: February 07, 2015, 10:53:33 am
Of course you can always just buy a few here for experimenting. Make sure you find a common anode driver for it.

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« Reply #6 on: February 07, 2015, 08:05:55 pm »
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I had a look at the display but it's a 12 pin mine is a 7 pin. I know how to run 12 pin displays and I think that I have figured out how to get this 5 pin running too but like I said it's not a priority for me at this point in time and I just want to understand how to get it to work, so I'll be experimenting on it when time permits. Right now I have a clock that point blank refuses to work with the 16f690 yet works 100% with the 16f877a and that's got me doing some head banging  Grin  

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« Last Edit: February 07, 2015, 08:08:41 pm by xavier »
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« Reply #7 on: February 08, 2015, 04:04:31 am »
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Did you have a reason for choosing the PIC16F690 chip? That device uses RB0-7 as analog inputs on some of the pins and unless you set the pins to digital, it won't work for most applications. Look on page 5, Table 2 of the spec sheet and you will find a pin summary. Then look on page 115 and see that the ADCON0 register, bit 0 must be set to 0 to have your RB ports set to digital. Then you must also set the tristate buffer to outputs. TRISB=0; in C.

That should get you back on track.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!

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« Reply #8 on: February 08, 2015, 05:49:40 am »
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I forgot to give you the code to set the ADCON0 register. Use ADCON0=0x00; for hex setup or ADCON0=0b00000000; for binary. I prefer to use binary because you can see on the ADCON0 chart that there are 8 setup bits, all of which can control the port if you set bit 0 to 1. So, if bit 0 is set to 0, the rest of the pins are invalid.

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« Reply #9 on: February 08, 2015, 09:25:58 am »
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Thanks GD

The only reason why I'm using the 16f690 is because I have one and I do not want to use a 40 pin PIC when all I really need are 14 pins, if I were using an LCD I would go for the 40 pin PIC because then I would add the date and the temperature (using a two line display with back light) I could even incorporate a GPS for automatic time and date setting. I could also put a light sensor so that the back light turns on when I turn off the lights and a host of other things but all I really need is a tic-toc that tells me the time Grin of course I could just go to the shop and buy one, sure would be a lot less stressful.  :Smiley  but then it would be like admitting defeat and I wont have that.   

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