16F872 and LCD

Closed Thread
Results 1 to 40 of 49

Thread: 16F872 and LCD

Hybrid View

  1. - 19th January 2008, 05:19 #1
    Pic_User's Avatar
    Pic_User
    Pic_User is offline Member
    Join Date
    Apr 2006
    Location
    New Hampshire USA
    Posts
    298

    Did you find this post helpful? Yes | No

    Default Back Light?

    Quote Originally Posted by Fredrick View Post
    The LCD is connected to the same voltage regulator as the PIC but not directly connected to the VDD or VSS PIC pin.
    Same supply as PIC is good.

    Does the LCD have a LED back light? The development board voltage regulator (VR) has no heat sink.
    Ohm it's not just a good idea... it's the LAW !
  2. - 19th January 2008, 05:26 #2
    Fredrick's Avatar
    Fredrick
    Fredrick is offline Member
    Join Date
    Jan 2008
    Location
    Sweden
    Posts
    187

    Did you find this post helpful? Yes | No

    Default

    The LCD does not have a backlight becouse it´s an (HD44780) OLED
    For 2 years or so i use the same OLED whit an 16F84 and the same code to and then i worked

    No it has not an heat sink, but it is capable of 1.5 A whitout an heat sink and that is more then i need.

    http://www.fractronics.com/oled1_b.jpg
    Last edited by Fredrick; - 19th January 2008 at 05:29.
  3. - 19th January 2008, 06:31 #3
    Pic_User's Avatar
    Pic_User
    Pic_User is offline Member
    Join Date
    Apr 2006
    Location
    New Hampshire USA
    Posts
    298

    Did you find this post helpful? Yes | No

    Smile How about....

    Hi Fredrick,

    The LM317 package would be rated at 1.5A with a very good heat-sink and the correct input voltage, to avoid, dropping too much voltage and heating itself.
    (input – output differential V)
    http://cache.national.com/ds/LM/LM117.pdf

    With no heat sink, 15 V input 5 V output, the 317 could overheat with just over 200 mA at 25 C.

    Regulator Heatsink Calculator
    http://www.ef-uk.net/data/heatsinking.htm

    How much current does the OLED LCD display draw?

    Is the voltage regulator getting hot (to your touch)?
    Can you “oscilloscope” the +5V supply? Watch for the voltage to dropout.

    -Adam-
    Ohm it's not just a good idea... it's the LAW !
  4. - 19th January 2008, 13:05 #4
    Fredrick's Avatar
    Fredrick
    Fredrick is offline Member
    Join Date
    Jan 2008
    Location
    Sweden
    Posts
    187

    Did you find this post helpful? Yes | No

    Default

    Quote Originally Posted by Pic_User View Post
    Hi Fredrick,

    The LM317 package would be rated at 1.5A with a very good heat-sink and the correct input voltage, to avoid, dropping too much voltage and heating itself.
    (input – output differential V)
    http://cache.national.com/ds/LM/LM117.pdf

    With no heat sink, 15 V input 5 V output, the 317 could overheat with just over 200 mA at 25 C.

    Regulator Heatsink Calculator
    http://www.ef-uk.net/data/heatsinking.htm

    How much current does the OLED LCD display draw?

    Is the voltage regulator getting hot (to your touch)?
    Can you “oscilloscope” the +5V supply? Watch for the voltage to dropout.

    -Adam-
    Ok thanx

    The VR is not getting hot.

    Edit: Heat sink is added just in case...
    http://www.elfa.se/elfa-bin/dyndok.p...dok=245171.htm
    Last edited by Fredrick; - 19th January 2008 at 23:03.
  5. - 19th January 2008, 07:26 #5
    skimask's Avatar
    skimask Guest

    Did you find this post helpful? Yes | No

    Default

    Quote Originally Posted by Fredrick View Post
    The LCD does not have a backlight becouse it´s an (HD44780) OLED
    For 2 years or so i use the same OLED whit an 16F84 and the same code to and then i worked

    No it has not an heat sink, but it is capable of 1.5 A whitout an heat sink and that is more then i need.
    Know what else might help?

    If you bought a legit copy of PicBasicPro from a vendor instead of download an old version of 2.45 from who knows where!
  6. - 26th January 2008, 22:17 #6
    Fredrick's Avatar
    Fredrick
    Fredrick is offline Member
    Join Date
    Jan 2008
    Location
    Sweden
    Posts
    187

    Did you find this post helpful? Yes | No

    Default

    Quote Originally Posted by skimask View Post
    Know what else might help?

    If you bought a legit copy of PicBasicPro from a vendor instead of download an old version of 2.45 from who knows where!
    That diden´t solve my problem, i still have o use the resistor in serie with Enable.
  7. - 27th January 2008, 10:30 #7
    Acetronics2's Avatar
    Acetronics2
    Acetronics2 is offline Fanatical Contributor
    Join Date
    May 2004
    Location
    NW France
    Posts
    3,653

    Did you find this post helpful? Yes | No

    Post

    Quote Originally Posted by Fredrick View Post
    That diden´t solve my problem, i still have o use the resistor in serie with Enable.
    Hi, Fredrick

    Why not send us you REAL scheme ??? ... and may be a link to your Oled Datasheet ( couldn't find anything about it yet ...)

    looking at various OLED displays Datasheet it seems :


    DEFINE LCD_COMMANDUS 4500
    DEFINE LCD_DATAUS 150

    are the values to use ... not so fast, those OLEDs !!!

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************
« Previous Thread | Next Thread »

Members who have read this thread : 0

You do not have permission to view the list of names.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Forum Rules