Discussion in "Project Doubts" started by    isha    Jul 13, 2007.
Fri Jul 13 2007, 09:01 AM
plz tell me that which microcontroller is used in the project "automatic room light controller with visitor counter" ?? In the description of the project 89c2051 is mentioned but in the circuit diagram 89S52 is used???????
Tags automatic room light controller with visitor countdigital visitor counterworking of sensor
Fri Jul 13 2007, 09:18 AM
i just checked.. the controller used is same 89c2051 here is the screenshot of the circuit. you might have downloaded a wrong file i think.
 isha like this.
Fri Jul 13 2007, 03:08 PM
sir, this is the screen shot of circuit diagram of project "digital visitor counter" not that of the "automatic room light controller with visitor counter" ...........

plz check that ... and also the code available for this project is not complete ,, it is only the following;

INCLUDE reg_51.pdf


ORG 000H




plz reply soon

Fri Jul 13 2007, 04:07 PM
ok might be my mistake.. i will check and get back to you.. and.. keep the doubts about a single project in a single thread.. so i am going to delete the other thread you created ok
Fri Jul 13 2007, 04:21 PM
Isha can you please wait.. i need to contact the Author of the project and inform him about the problem. His projects contain so many error.. :mad
Fri Jul 13 2007, 04:29 PM
Isha have a better option for you.. if you simply modify the digital visitor counter project.. add some functionality for switching off the bulb when counter is 0 and switch on as soon as count is greater than 0... that will be a good option... if you want to try it..
 isha like this.
Fri Jul 13 2007, 05:55 PM
Thanks sir
i think i should first try "digital visitor counter" and then i'll try to modify that...

can u plz give some details of circuit diagram of "digital visitor counter" , functionality of each component , specially that of transistors , seven segment displays and LDRs... how do they work???
Fri Jul 13 2007, 06:14 PM
check you previous post.. i actually explained the working of digital visitor counter.. see your last posted thread..
Sat Jul 14 2007, 08:39 AM
the transistors are used to drive the common cathode of each 7 segment display,

the displays here are used with multiplexing technique means there is only one display works at a time but it shifts so fast therefor all display works simultaneously

the two LDR's here use for input as active low. means initially it is in high state (1)and it get input by grounding the pins (or 0)
 isha like this.
Tags digital visitor counterworking of sensor
Sat Jul 14 2007, 09:49 AM
check this post where i explained the working

[ Edited Sat Feb 16 2008, 09:14 AM ]

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Sun Oct 13 2019, 07:32 AM
Aline Hutchinson
Hey there,
Sun Oct 13 2019, 03:53 AM
Log in.. then post your code in the 8051 forum
Sat Oct 12 2019, 03:48 PM
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, 01:07 PM
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.
Thu Sep 19 2019, 02:18 AM
Caryn Kover
Thank you for your time,
Tue Aug 06 2019, 12:39 AM
@Ismail ..post in forum, give details
Mon Aug 05 2019, 10:03 PM
Ismail balghmi
Hello. Please I won't download
Wed Jul 24 2019, 06:17 AM
@BUSTER123 Please post in the forum
Tue Jul 23 2019, 11:43 PM
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.
Fri Jul 12 2019, 01:25 AM
@ramos https://www.theengineeringprojects.com/2017/09/l298-motor-driver-library-proteus.html



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