Switch LCD OFF during sleep, possible?

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  1. - 14th December 2006, 16:46 #1
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    Default Switch LCD OFF during sleep, possible?

    Hello,

    I'm using a 16F88 and an LCD display.

    Is it possible to switch OFF the LCD display during sleep mode to drop the power consumption even more?

    If yes, how?
    Roger
  2. - 14th December 2006, 17:21 #2
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    Default All things possible

    Hi Roger,
    sure it's possible, just power your LCD from a pic pin, you might have to use a switching transistor, and you might not. How much current does your display draw when in full display minus backlight, and how much does it draw when all blank? It may not be worth the effort, I have seen LCDs powered by very small batteries for very extended times.
    JS
  3. - 14th December 2006, 17:27 #3
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    Talking Inverted logic ...

    Quote Originally Posted by flotulopex
    Hello,


    If yes, how?
    Just apply Power through a Pic PIN when NOT asleep ... and think to change the pin level BEFORE entering sleep !!!

    La Pallice book 34, chapter 9,10 and 11 !!!

    Alain
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  4. - 14th December 2006, 17:49 #4
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    Default ... was to simple for me!

    Okay,

    I should have think about such a simple solution...

    "La Pallice", do you mean the Compiler's Manual?

    Thank you.
    Roger
  5. - 15th December 2006, 06:45 #5
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    Default

    Quote Originally Posted by flotulopex
    Okay,


    "La Pallice", do you mean the Compiler's Manual?

    Thank you.
    No,Flotul ...

    The man who wrote around year 1700 ... , between others: " a quarter before he died, he was still alive ..."

    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 " !!!
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  6. - 16th December 2006, 05:40 #6
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    Default Make sure you clear the flag

    Hi,

    If you are powering your LCD you need to re-initialize the LCD. PBP would do that for you when it encounters the next LCDOUT instruction. All you need to do is

    FLAGS=0

    This will guide PBP LCD library that the LCD has not yet been initialized.
    Regards

    Sougata
  7. - 16th December 2006, 07:35 #7
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    Default Flag?

    I don't understand.

    If you are powering your LCD...
    Do you mean this if I power the LCD through a PIC's Pin ?

    Shall I set FLAG=0 when I come back from sleep mode?
    Roger
  8. - 16th December 2006, 09:11 #8
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    Default

    Look at page 93 of the latest manual. It is FLAGS (with S) not FLAG.

    If you power down your LCD, also set FLAGS=0. Before using any LCDout commands.

    Ioannis
    www.signalcom.gr
  9. - 16th December 2006, 10:23 #9
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    Default

    Thank you.

    I found it now too...

    Didn't think this was important.
    Roger
  10. - 16th December 2006, 11:22 #10
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    Default Yes It is important

    Hi,

    I hope that it is clear now. And thanks Ioannis for marking flutoplex's mistake.
    Regards

    Sougata
  11. - 16th December 2006, 11:39 #11
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    Default

    Hi Sougata,

    you are welcome. A simple typo mistake can lead to many hours of wasted time. Been there before....

    Ioannis
    www.signalcom.gr
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