problem in interfacing of 4 by 3keypad and LCD

[Pradip Chikani]

Hello…sir

I am doing my final year project on Interfacing of LCD & 4*3 Matrix keypad..but i cant read alphanumeric digits on LCD when i press any key….tell me i how it possible?…is there all the projects and Source codes are checked and worked?….all projects are running?….pls help me bcoz my submission is on 15th july….please sir help me immidiatly…

[ARPIT SONI]

the codes are all checked and are working propely.even the comments are also written ther u shuld check whether the code is for avr or 8051.and check ur circuit 

[dagakshay]

hello Pradip,

the codes and ckts are very proper…. if still that code is not working remove the pullup resistors from the input pins on the keypad… then try let me know it you get if you get it….

[SaLMAN Ahmed Khan]

 

 

i think u must wired the lcd on some other port istead of port0 

[arj]

hi

i am facing a similar problem, i designed the circuit on proteus exactly as it was given on the site but the results are not right. can anyone plz give me a proteus design which could run the code given at the following link, properly

http://www.engineersgarage.com/microcontroller/8051projects/interface-keypad-at89c51-circuit

[gantulga]

hi are you online?

 

[nikhiljain]

Hello,

 

The proteus simulation may not work correclty everytime. You must try it out on hardware and troubleshoot the problems.

 

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