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Thanks Ashutosh..
I actually connected a 33 uF cap at power pins of LCD earlier..
Now I'll try connecting freewheeling diode & 0.1 uF cap across power pins of DC Motor & microcontroller respectively; and then let you know the outome soon..
Thanks for the advice..
Kindly reply guys, if you have had a similar experience or any idea about its solution..
It's really very important for me.. Because I am stuck with this problem & desperately need a solution..
Thanks for the reply sir.
Actually all the connections are proper & LCD displays all the messages perfectly until the speed of DC motor is constant.
As soon as we switch the position of knobe on DC Fan from low to high or vice versa; the LCD starts showing some garbage characters after sometime. I guess this is a kind of EMI / inductive effect of back emf generated by DC motor which is forcing LCD to go uncontrolled & show some garbage values..
What do you say?
Try AT89S52 instead of 89C52… & software tool for the same is AT89ISP…