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Issue with HD44780 LCD blinking

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johncsl82

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hi..

I have a project that pic16f84a interface with LCD HD44780.... the LCD display word but it like "on and off" which mean the "hello world" word is there for a second and disappear and there again.......

so any solution?
 

throwaway18

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lcd blinking text

This may be a bug in your PIC software. Is the PIC sending commands to the LCD that cause it to be blank?
 

johncsl82

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what causes lcd to blink off and on

I tested the software under Proteus VSM simulation.... is ok..

Here the attachment contain the source code and schematic:

link: http://dl1.uploadgalaxy.com/files/0dc6b9512856/lcd.rar

P.S: updated with the correct original verion of project but the problem still remain unsolved

Thanks
 

shankarmit

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lcd blinking

You must configure the LCD properly..

There are address ports for that LCD..check that u have given correctly values..



Regards
Shankar
 

sat22

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lcd display blinking

Hi,

I don't program the PIC in C language, so i can't say if the code is right or not. But, if i understand you well, i think the problem is that you turn on the watchdog timer.
Turn off the watchdog timer and try again.

regards.
 

pvinbox@yahoo.com

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pic project lcd check

hai

mainly two reasons
1. you have sent the command to clear the LCD display
2. watchdog timer may be on

try to clear that command which will clear lcd and turn off the watchdog timer.
Because watchdog timer resets the controller whenever it gets overflow.
Before the overflow it should be cleared by the software.
so dont use watchdog timer in your code
 

shahbaz.ele

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Dear johncsl82
the link you have given for lcd.rar is not opening here with me.
please can you send me this on shahbaz.ele@gmail.com
I wnat to implement it with dsPIC33FJ64MC802
can anyone help me in this regard
thanks to all in advance
 

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