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Topic: LCD text corrupts after Arduino runs for length of time (Read 1 time) previous topic - next topic


Thanks doc,   The board is powered from computer SMPS ,  I try putting high value caps in LCD area also .  In the system whenever Relay is getting switched off and ON it is happening .  some time SMPS also gets switched off ,all well grounded  , no earth leakage


I have experienced similar issues with the lcd of my coffee machine controller when I flicked the mains switches. I found it helped to keep the LCD cables short and very tightly bundled together (read this somewhere but can't remember the technical background)....


This i tried once i helped me , but not so much , LCD gets corrupted after some time later , i need rugged solution . 


Since the Arduino drives the display use a 4K7 pull down on all the data and control leads. I think your issue is a floating port pin. In a quiet atmosphere it wouldn't make much different But a motor, particularly an inductive motor being switched on with a regular contactor is a very noisy thing. If the load hits at the right part of the cycle it is terrible... Right before the peak of the cycle and turning them off is no joke either as the energy stored in the motor's magnetic field has to go somewhere. 4K7 ohms will have minimal effect of the operation of your device and it's operation. you might welll be able to install them right on the back of the LCD itself.

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Jun 30, 2012, 12:15 pm Last Edit: Jul 03, 2012, 12:52 pm by ariesprg Reason: 1
//My problem got sorted out after i made the PCB with display soldered and processor is very close to the display .//

No still corrupting some times ,even i put 4.7k ressitors on control and data lines ,still the same issue i am facing , plz suggest some rugged idea , i pullup all the unused pins too . 

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