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Author Topic: problem with lcd  (Read 1049 times)
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alejandro
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« on: October 04, 2006, 07:11:01 19:11 »

Hi, I hope someone can help me
I have built an automatic trasnfer switch for genset
it makes all necesary to turn on the motor of the
generator when the mains goes down.
The circuit has a 18f452 and an LCD 2x16 Truly
the problem is that sometimes the lcd after hours of working ok
hangs up and the display becomes black ( the pic still works ok)
I put big capacitors in the power source (4700uF - 7805-4700uF)
but the problem persists
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nikhilele
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« Reply #1 on: November 04, 2006, 10:37:17 10:37 »


Have u tried connecting a different new lcd.

what others things u can do provide a switch (Transistor based) to LCD
and reinit lcd after some fixed intervals like in few minutes.
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hansolo
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« Reply #2 on: November 04, 2006, 02:28:59 14:28 »

This is a common problem with LCD.

The LCD driver circuit tend to hang when large load sharing the same line switches on/off.

What you can do is keep re-initilise the LCD after every few minutes irrespective weather the LCD hang or not. That is what I do.
 
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alejandro
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« Reply #3 on: April 08, 2008, 01:51:22 13:51 »

hansolo
thank you very much, your advice was the solution
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Epegic
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« Reply #4 on: April 18, 2008, 09:28:52 09:28 »

"The LCD driver circuit tend to hang when large load sharing the same line switches on/off."

I don't agree with this statement, there must be something wrong with the software. Re-initilse periodically can cover up the real problem but not a proper solution.
 
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