LCD Displays

Go To Last Post
11 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Can displays in gadgets be used?

I opened one, on the glass panel a rubber conducting pad is sandwiched between the PCB and the display. The sandwich is held by the screws holding the PCB in place.

Can these displays be used ? if yes how?

By how I mean how do we connect these displays in our circuits?

 

Regards

 

Karanbir

 

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 1

Hi Karanbir.

 

My advice is... forget it. These displays are without any onboard controller so you must control the individual display segments yourself... and neither you nor I has enough lifetime left to arrange that.

 

Cheers,

 

Ross

 

Ross McKenzie ValuSoft Melbourne Australia

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Thanks Ross.

 

Karanbir

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

valusoft wrote:
My advice is... forget it

Absolutely!

 

You are highly unlikely to be able to get any documentation or support whatsoever - so you're completely in the dark and entirely on your own.

 

karanbir wrote:
on the glass panel a rubber conducting pad is sandwiched between the PCB and the display.

In my experience, the chances of just re-assembling that kind of connector in the original equipment and having it work reliably are pretty slim - so the chances of you making your own connector from scratch are remote in the extreme!

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillatorhttps://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Short yes.

But just do it for fun!

 

If you are able to measure while it's running you have a change to find out how it works.   

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Yes you can use them.

Atmel has a couple of controllers that have a LCD interface.

You need that in order to make the correct signalling on the lines.

there will be a number of common lines and a number of segment lines.

 

In general it is better to forget them and use a display that already has a display controller attached.

unless you intend to go to mass production, then using a glass and zebra strips might be cheaper....

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Atmel has a couple of controllers that have a LCD interface.

ATmega169 and ATmega369

 

Like others here I would advise against it though - it could be very tricky to work out how to wire such a display - I've thought about "repurposing" the displays from calculators in the past but have then thought against it when I've tried to identify the signals. To stand any chance you must own an oscilloscope.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

clawson wrote:
To stand any chance you must own an oscilloscope.

And, of course, know how to use it.

 

And know what you're looking for on the connections to the LCD.

 

But, if the OP had all that, I doubt he'd need to ask the question ...

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillatorhttps://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

meslomp wrote:
unless you intend to go to mass production, then using a glass and zebra strips might be cheaper....

But then you wouldn't be using 2nd-hand displays salvaged from old equipment!

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillatorhttps://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

We did a custom glass with zebra strips back in the early 2000s... the glass is such a high impedance that one atom of finger grease on either the edge of the zebrastrip and/or the glass that touches it is a complete insulator, and that segment goes out, so you disassemble it, clean with trichloroethelene ans breathe the carcinogenic fumes, repeat above process a half dozen times. Its a pita like that bread.

 

 

Imagecraft compiler user

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

bobgardner wrote:

We did a custom glass with zebra strips back in the early 2000s... the glass is such a high impedance that one atom of finger grease on either the edge of the zebrastrip and/or the glass that touches it is a complete insulator, and that segment goes out, so you disassemble it, clean with trichloroethelene ans breathe the carcinogenic fumes, repeat above process a half dozen times. Its a pita like that bread.

 

 

 

And you've been like this ever since?

If you don't know my whole story, keep your mouth shut.

If you know my whole story, you're an accomplice. Keep your mouth shut.