Discussion in "New Ideas regarding projects" started by    ugoo5000    Jul 29, 2016.
Fri Jul 29 2016, 11:48 AM
#1
i am working on a project to generate a continuous pulse of 1 second on p1.2 when p3.0 is depress to ground. but is not working ,pls i need help
below is my code

org 00h
mov p1,#11111111b
mov p3,#11111111b
start:
mov p1,#11111111b
mov p3,#11111111b

start1:
jnb p3.0,count
jmp start1


count:
setb p1.2
clr p1.2
call delay
setb p1.2
jmp start1



delay: ;DELAY OF ONE SECOND
MOV TMOD,#01H
MOV TH0,#3CH
MOV TL0,#0B0H
MOV R7,#00H
SETB TR0
DEL:JNB TF0,DEL
MOV TH0,#3CH
MOV TL0,#0B0H
CLR TF0
INC R7
CJNE R7,#14H,DEL
ret

end
Fri Jul 29 2016, 11:50 AM
#2
below is the proteus file
Fri Jul 29 2016, 07:31 PM
#3
Hi
Your Proteus file did not upload, be sure to zip it before attaching.

Your code is okay.
Are you able to program your 8051 to do a simple LED flash ?.
Fri Jul 29 2016, 07:49 PM
#4
i want the the counter to be counting in secs with the real time clock but is a second late to compare with real time clock, i mean the proteus time, stimulate it and see


[ Edited Fri Jul 29 2016, 07:52 PM ]
Fri Jul 29 2016, 11:34 PM
#5
Your code does not count at all, it produces a one-shot, low pulse for each button press.
Can you zip and post your Proteus project.
Sat Jul 30 2016, 06:30 AM
#6
proteus file
Attachment
Sat Jul 30 2016, 06:40 AM
#7
when i press a button in p3.0,the counter will start to count but my problem is that the counter is not counting in real time in second with real clock the ,how can i make the clock delay to produce pulses in a second? is like the upper and the lower pulse in my signal is delayed a second making a complete cycle 2seconds,i tried to divide the pulse by 500ms so that i can get the total pulse to be 1sec but i cant generate a delay for 500ms, pls can you help me out


[ Edited Sat Jul 30 2016, 06:41 AM ]
Sat Jul 30 2016, 07:31 AM
#8
is working now
org 00h
mov p1,#11111111b
mov p3,#11111111b

start1:
jnb p3.0,count
jmp start1


count:
setb p1.2
call delay
clr p1.2
call delay
jmp start1



delay: ;DELAY OF 500ms
MOV TMOD,#01H; delay for 50ms
MOV TH0,#3CH
MOV TL0,#0B0H
MOV R7,#00H
SETB TR0
DEL:JNB TF0,DEL
MOV TH0,#3CH
MOV TL0,#0B0H
CLR TF0
INC R7
CJNE R7,#10d,DEL; 10*50ms=500ms
RET
end
Mon Aug 01 2016, 05:26 AM
#9


is working now

ugoo5000


Great, thanks for letting us know.

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Thu Nov 21 2019, 12:30 PM
raj2555
how to interface 8051 microcontroller with NRF24L01+ module
ExperimenterUK
Sat Oct 12 2019, 10:23 PM
Log in.. then post your code in the 8051 forum
Sat Oct 12 2019, 10:18 AM
Bhadra Sajikumar
i am doing a countdown timer with 8051 for my project, unfortunately our professor had to take a leave of absence before he could teach us most of it.. can someone explain the .asm code of it for me?
Mon Sep 23 2019, 07:37 AM
Nathaniel
I am doing a project for my schools wireless security system with cameras,sensors and spot lights using 8051 micro controller, could you help me out with the design and its source code.
Wed Sep 18 2019, 08:48 PM
Caryn Kover
Thank you for your time,
ExperimenterUK
Mon Aug 05 2019, 07:09 PM
@Ismail ..post in forum, give details
Mon Aug 05 2019, 04:33 PM
Ismail balghmi
Hello. Please I won't download
ExperimenterUK
Wed Jul 24 2019, 12:47 AM
@BUSTER123 Please post in the forum
Tue Jul 23 2019, 06:13 PM
BUSTER123
hello! newbie here. i am kind of a guy who hates using ready - made existing libraries, so this helped a lot as i was trying to control and write to a character lcd display. however, i can't figure out how to set the cursor position. for example, i want to set it to the 5th column in the first row, so position 5. so according to the table, i am sending 10000101 on the 8 data lines of the lcd (register select pulled low). the cursor does not move there however. and i cant move the cursor left or right too. is it something wrong that i am doing? thank you.
ExperimenterUK
Thu Jul 11 2019, 07:55 PM
@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html

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