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[HELP] How to change the LCD port of the Digital Code lock?

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nov2

Tue Mar 04 2008, 06:13AM

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hi sir,
i'm a freshman of 8051 and i'm going to build a security system as my project.
ur Digital Code lock with LCD and Keypad using AT89C2051 is really helpful
but i have a problem:

i'm using 89s52 as my mcu and i want to use port3 to connect the keypad
and port0 to connect the LCD. how should i modify the program to achieve it?

really need help......THX!!!

Ajay

Tue Mar 04 2008, 06:20AM

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are you going to use a different controller? i mean other than AT89C2051? why P0 and P3? special reasons?

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nov2

Tue Mar 04 2008, 06:47AM

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my project is supposed to be used in a shop, so it will have PIR sensor as detector, keypad to open the door or disalarm the system.
actually, i bought a 8951 Single Board Computer from the market and the default LCD port is port0. the 8052 is 40 pins type.

Ajay

Tue Mar 04 2008, 08:38AM

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ok i understood.. but this means.. there might be change of connections.. not same as that of what i used.. In which mode LCD is connected on that SBC?
In my project i used LCD in 4-bit mode.

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nov2

nov2

Tue Mar 04 2008, 10:22PM

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er...i'm not sure what is LCD mode but i guess is the same as urs. i will check it tonite and tell u.
btw, really appreciate ur prompt response!!

nov2

Tue Mar 04 2008, 11:39PM

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sorry that the default LCD port should be port1...

well, i can't find the bit mode, is it a big matter?

Ajay

Wed Mar 05 2008, 09:05AM

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yes it does matter.. coz the code is written for LCD 4-bit.
Just tell me how LCD is connected to 8051.. i mean the connections of LCD pins with 8051's port 1. only then i can see what can be done.

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nov2

Wed Mar 05 2008, 09:24PM

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is 2x7 jumper

Ajay

Thu Mar 06 2008, 03:54AM

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looks like LCD is in 8-bit mode.. but i am still not sure.. why don't you see board's manual. you might get some info. Why don't you make a new board? whats problem with that?

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cyrexxx

Tue Sep 30 2008, 09:40PM

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@Ajay even i want to change the port ... i am using a at89c52 chip

the lcd works fine in p3 ( actually i have adapted your lcd.c and lcd.h for my project ) but when i connected it to p1 or p2 it doesn't initialize (p0 is used for keypad ) i need to use p3 for interrupts .
pease help