Propeller Display using AT89C2051

Propeller display Error
Guys, I have constructed this project but the display is showing certain anomalies. Here is the picture of the error in the display its showing. Please do help me to analyse the problem.

@ rahul7301
try to adjusting the speed of motor by varying a voltages

@Majoka bro, Thanks for your suggestion. I tried varying voltages as you said but dropping down 12V to 9V gives me a low rpm affecting the clarity of the display although the defect is reduced (but not removed completely).

Also, I cant understand if the defect is due to the stationary object used to interrupt the sensor as my rotating assembly is slightly unstable which I think is negligible, once the rotation is set. I have used a flexible sticking tape to interrupt the sensor. So, is it correct as per your views about this display??

To me it looks more like problem with decoding of data.. did you try some other text? shorter one? just to take a look what happens? so that we can conclude the source of problem.

PS: Your display looks great i like it...

If you didnt notice, the proper displaying of characters starts only when the external interrupt is being triggered. Try putting some more spaces at the last of the message to be displayed in program.

well, my previous comment was a misleading one, i guess..anyways, after making it, me too had the same problem wit slower speeds. But after adjusting the speed, its fixed now..

CAN ANYONE SEND THE .sch file for the pcb design provided so that to make a pcb....

PCB layout is available here:
http://www.8051projects.net/t35730/project-help/propeller-display-using-at89c2051.htm#post_35805

i need a little help..m making a propeller clock..n i want it to display different character n names..but when i change the characters(from project[display[[[[[[[[[ ) n try to creat a new hex file...it gives the following eror;

ERROR: ')' AFTER PARAMETER EXPECTED
C251 TERMINATED.
Target not created

Note:m using keil(c2051) to edit program n create hex file
thanks in advance

i need a little help..m making a propeller clock..n i want it to display different character n names..but when i change the characters(from project[display[[[[[[[[[ ) n try to creat a new hex file...it gives the following eror;

ERROR: ')' AFTER PARAMETER EXPECTED
C251 TERMINATED.
Target not created

ahsanzafar123

Probably a typing error.
Post your code as a zip attachment.