8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / topic http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008 Rickey's World contact@nospam.com (Ajay Bhargav) contact@nospam.com (Ajay Bhargav) Thu, 08 Jan 2009 19:46:14 -0800 Thu, 08 Jan 2009 19:46:14 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html transmitter n reciever part it would be a great help
and is there any changes in the code of this project?? or any
problems in the ckt???
please sir this is really urgent
if u can help me out please....]]> Mon, 03 Mar 2008 03:23:00 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html ]]> contact@nospam.com (Ajay Bhargav) Mon, 03 Mar 2008 08:54:42 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html i just wanted to knw if possible if u can me with this project
n explain me the reciever side of the ckt please]]> contact@nospam.com (Ajay Bhargav) Mon, 03 Mar 2008 08:57:44 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html The 555 is configured as a monostable and in a monostable the output duration(here 0.242s) should be greater than input pulse(provided by the visitor interrupting the sensor).Surely you would want to give atleast 0.24 seconds for a person to pass through .... do consider a fat guy walking past at a leisurely pace ]]> contact@nospam.com (Ajay Bhargav) Wed, 05 Mar 2008 20:45:56 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html room.gif
first the left side of AT89S52:
you see two sensors. sensors are connected in the following way on the entrance of door.
---> Entrance this way -->  --------
  S      S
  1      2
  --------

S1 is sensor 1 and S2 is sensor 2
555 timers gives high->low pulse whenever user crosses the sensor.

Now right side of AT89S52, you have 7-segments to show count and one bulb through relay. When user count in room is greater than 0 blub glows.. if users in room are 0 blub switches off.. hence controlling the room's light.

Now room1.gif
it just have two transmitter circuit which will be on the other side of door facing the receivers(sensors) on the other side of door.

I hope circuit is clear to you now.. is there anything else you want to know about?]]> contact@nospam.com (Ajay Bhargav) Tue, 04 Mar 2008 09:06:42 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html i have another question...
y did we add 56k resistance n cap. to the reset pin?? and how did we arrive to those
values.
wats the function of 555 in the room.gif n how did we arrive to those values??
as i calculated the t=0.24secs so y tat long???]]> contact@nospam.com (Ajay Bhargav) Tue, 04 Mar 2008 09:21:35 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html i m not able to understand how come we have chose 100K n 2.2uf
for the 555 to get t-0.24secs for pulse width to be given to the MC??
where did we get those values can u please help me with tat?? y 100k n 2.2uf
n y a period of 0.24secs as a pulse width???? tats where im little confused...]]> contact@nospam.com (Ajay Bhargav) Tue, 04 Mar 2008 09:36:12 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html 56K n 1uf cap with reset pin???
y is tat also??? its just not making sense to me..
so can u please me n the earlier thread... thanz you..]]> contact@nospam.com (Ajay Bhargav) Tue, 04 Mar 2008 09:43:35 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html
whatever you mentioned in point 2 is correct...
when interrupted you will get low.]]> contact@nospam.com (Ajay Bhargav) Wed, 05 Mar 2008 11:57:29 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html i just wanted to the y 555 is giving a 0.242 secs of low op in the ckit
and how did we arrive to tat value of 100K??? please sir can u reply me tat
asap if it would be really help.
2. the sensor gives a op of 5V whn it is not interrupted and CE cofig is used??
wats the use of tat CE config in this ckt for amplying?? whn the sensor is not
giving any output whn it is interrupted??
thank you
please sir hopefully u can answer my doubts...
thank you again..]]> contact@nospam.com (Ajay Bhargav) Wed, 05 Mar 2008 10:06:15 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html but i dont understand y its being used the 555 n amplifying CE ckt..
coz in the sensor datasheet they have put sensor directly to the
uC without the those two ckts!!!!
i knw how to get the resistor value...
but i dont understand y we have only chose 0.242 secs for a low pulse being
applied to the ckt...and finally the use of 555.. its not clear.. can u please
explain it to me... couldnt we have fun a lower time period of a low pulse than
we have calculated...]]> contact@nospam.com (Ajay Bhargav) Wed, 05 Mar 2008 18:14:55 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html so how does it work then.. if we cross both sensors then
how does it knw whn it shld turn on? n turn off??
is it confusing!!!!!!

how does it work whn its suppose 2 turn off the lights??????
so we cross both the sensors n the light turns on tats it..
but how it suppose 2 knw whn light is suppose 2 turn off??
i thought the first sensor sensors senses the light to be turned on
n the second sensors senses whn the people leave n turns off the lights!!!
so yah.. wats the thing... can u explain it to me.. please...
[ POST MERGED ]

is there any specific specf. tat the first sensor or second sensor has 2 be crossed or it can be any order??????
[ POST MERGED ]]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 06:32:29 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html so tats y nothing seems to work.. and there might be a problem with
the seven segment code n the checking of the sensors...
so can help me out
thankz you...]]> contact@nospam.com (Ajay Bhargav) Fri, 07 Mar 2008 21:24:01 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html but the the reset pin of 555 is connected to the VCC=5v... which is high..
i think u meant the trigger pin from with the transistor is connected?? i thought the 555 gives a high to low pulse??? or is it other way around low to high pulse???? being given to the uC can u explain me tat part also!!!!! please thanz you.. just little bit into the dark
abt tat part!!! thank you for explaining me tat much...]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 01:15:59 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html whn there is no interruption the sensor gives a high output..
the inverter inverts the o/p from a high to low o/p n supplys it to the 555..
555 gives a low o/p also which doesnt give any o/p to the uC..
am i correct so far?? for the working???
whn there is a interruption sensor sends a low o/p which is converted
into high o/p from the transistor n the 555 gives a high o/p to the uC and
it detects it as port 1 is needs 1 to act a input and increments the counter n
turns on the lights?? tats how the project works??? correct!!!
]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 01:26:57 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html
can you tell me which compiler you are using and can you please copy paste those errors so i get a better view of where the problem lies.

and yes you can use 89C51 if code fits in it and make sure there is no special things like storing count in code memory going on.]]> contact@nospam.com (Ajay Bhargav) Fri, 07 Mar 2008 20:32:52 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html ]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 06:21:56 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html sorry to disturb again..
i implemented the ckt.. there is a slight problem in the code..
as soon as the first sensor the entry sensor is interruppted the lights are on tats ok
whn the uC checks for the first sensor again it switches off it doesnt check the
second sensor only..
its just first sensor interrupts the lights on n whn it senses the sensor1 o/p is high
it just offs the light.. again...]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 03:42:26 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html
I tell you.. as i explained earlier, sensors are connected at the door stacked one after the other.. from the entrance side sensor 1 comes and then sensor 2.

So when you enter inside the room, you cross first sensor and then second sensor.. and room visitor count is incremented by 1. when you come out of room.. you cross sensor 2 and then sensor 1 and count is decremented by 1.

If the count is greater than 0, then light is on... and if count is 0 then light is off. This is how room lights are controlled automatically. and thats the main purpose of this project.

PS: Please do not make multiple posts.. you can click on edit icon to edit your post and add anything you want in your post ]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 08:03:21 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html sorry.. i wont do it again!!!1
thanks alot u have helped me alot with all my doubts.. just one last questions
wat the use of 33e (33 ohms right??) in the transmitter side???
rest of my doubts are cleared thank alot.. really u have been really helpful...]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 08:39:30 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html whn there is no interruption the sensor gives a high output..
the inverter inverts the o/p from a high to low o/p n supplys it to the 555..
555 gives a low o/p also which doesnt give any o/p to the uC..
am i correct so far?? for the working???
More confusion.....when the sensor is interrupted it's output is high(it's a TSOP I presume).The transistor inverts it to a low and so the trigger i/p of 555 gets a hi to low pulse which is needed for the monostable to fire.It then outputs a pulse of 0.24s.
With no interruption the sensor's o/p is low hence 555's trigger is high so it doesn't fire.
Get it?]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 09:52:24 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html 1. alrgiht.. and both the sensors have 2 crossed in order to turn on or off the list
at the same time!!!
2. n wats the use of 33ohms on the transmitter side??]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 10:18:43 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html So you use 2 sensors(say a,b) and look for the sequence of interruption.If sequence is a,b then increment counter.If seq is b,a then decrement counter.I haven't seen the code but probably should be like this.
The 33ohms resistor is used for limiting the current into the infrared diode.]]> contact@nospam.com (Ajay Bhargav) Thu, 06 Mar 2008 22:02:49 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html coz whn i debug it.. its giving me warning of "data space memory overlap"
because of tat the project is not working...
nothing seems to work!!! the hardware is working so please can u help me out..
if u can??? if u dont mind????
coz of that the seven segment display doesnt work as its memory is overlapping
please.. can u help out with the code???
does it matter instead of 89s52 i use 89c51???]]> contact@nospam.com (Ajay Bhargav) Fri, 07 Mar 2008 07:35:42 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html its its alright with u????
i understood the working itself its not a problem.. its just error n stuff!! so just i will email u the code and the screen shot of the error.. the warning the message...]]> contact@nospam.com (Ajay Bhargav) Fri, 07 Mar 2008 21:12:50 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html you can download a free evaluation version from http://raisonance.com/]]> contact@nospam.com (Ajay Bhargav) Fri, 07 Mar 2008 21:56:53 -0800 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html sir i have tried to download tat program but it keeps crashing...
i dont knw y??? can u please.. tell me the version to download??
the program just crashes!!! w/o even entering the project!!

is it possible to convert this code to keil supported code???
coz ride is not working?? if possible can u tell me the changes please it will be really
helpful if u can quide me doing the changes in the program so it can work.. we have our
submission of this project next week thank you very much..]]> contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 06:17:16 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html you need to change this part of code..

CODE:
DSEG            ; This is internal data memory
   

        ORG     20H     ; Bit adressable memory
        BITS:   DS      1
        UP      BIT     BITS.0  
        DWN     BIT     BITS.1
        COUNT:  DS      1
        SPEED:  DS      1
        VALUE_1:         DS     1
        VALUE_2:         DS     1
        VALUE_3:         DS     1
        COUNTER:        DS      1
        STACK:           DS      1       ; Stack begins here
        CSEG            ; Code begins here
 


to

CODE:
;DSEG            ; This is internal data memory
; Remove above line

        UP      BIT     0H  
        DWN     BIT     1H
        COUNT   EQU     30H
        SPEED   EQU     31H
        VALUE_1 EQU     32H
        VALUE_2 EQU     33H
        VALUE_3 EQU     34H
        COUNTER EQU     35H
        STACK   EQU     50H     ; Stack begins here
        
;CSEG            ; Code begins here
;Remove the above line
 


Try it and tell me..]]> contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 10:43:51 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 14:00:06 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html ok.. thanz alot..
but can there be any other changes??? if so can u please check it out??
and tell me.. it wiould be really helpful if u can..
thank you..
thanks alot for the updated code.. thanks you.. ]]> contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 12:22:05 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html its a dos based program so.. its creates a hex file and lst flie also...
so im sending u the .lst file and i have question wats the use of vlaue_3
as its never been used along with different parameters as u can see in the lst file..
i have added $mod51 to it also... so yeah
w/o using $mod51 its giving me more errors where equ have been defined. and whn its being used
again.. so.. yeah.. tats it. thanz you...
but its not giving me any warning tat memory overlapping memory..
]]> contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 22:32:54 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html As for the Value_3 it seems Ajay's got the wrong project,"Digital Visitor Counter" instead of "Automatic Room light Controller with Visitor Counter".]]> contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 22:37:32 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html can u tel me tat.
its giving me a warning message of memory overlaping
in keil so.. which email??? can u tell me..]]> contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 22:42:40 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html light.a51 is the orginal file where it keeps giving me a warning message of memory overlap
while using keil..
ajay converted the orginal file and gave me the updated version.. tats a .asm file..
but there is a error.. there is parameter not defined.. sashi joseph sir.. this is the
both the files thanz you.. but it doesnt seem to work only.. esp the counter and turning of on
n off of the light.. so tats the only problem which is the major one thanz u. sashi joseph sir
hope u can get the file in this attachment... thanz you...]]> contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 22:47:20 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html Oops...binaries not allowed.]]> contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 22:50:40 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html light.zip]]> contact@nospam.com (Ajay Bhargav) Mon, 17 Mar 2008 22:54:36 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html along with asm n .lst file.. please
was there any memory overlapping warning showing?? when u compiled or
debugged the program??? please can u tell me tat much and send me the
attachment along with asm n .lst file. thanz for the hex code....
its really helpful..
but if i wanted to convert it to keil how would i do tat???? can u tell me tat also
please.. as we are only using kiel in our college for uC 8051.. so yeah thanz
i will load the micro-controler with this hex file n let u knw.. thanz...]]> contact@nospam.com (Ajay Bhargav) Tue, 18 Mar 2008 06:39:39 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html instead??? and tats it???nothing else i have 2 do??? and it work properly
with all the function n there will be no problems????
if tats there thanz... i wil test it out asap.. thank you..]]> contact@nospam.com (Ajay Bhargav) Tue, 18 Mar 2008 10:53:50 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html http://www.metaice.com/ASM51/Files/ASM51.zip
Use the attached inc file(place it in ASM51 folder).
In the Light.a51 file replace "INCLUDE reg_51.pdf" with "$include(REG51.inc)"
It should compile fine.
8051_inc.zip]]> contact@nospam.com (Ajay Bhargav) Tue, 18 Mar 2008 08:04:13 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html which is overlapping and hence there is a problem in the working
of the program.. and so therefore nothing seems to work tats the
problem we are having.. tats the problem... there is no errors
just a memory overlapping problem which is seen in keil and therefore
nothing is working the couter or the turning on n off the lights and everything]]> contact@nospam.com (Ajay Bhargav) Tue, 18 Mar 2008 11:00:34 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html make them equ with ram address.. e.g.

change

abc DS 1
def DS 1
ghi DS 1

to

abc equ 30H
deg equ 31H
ghi equ 32H

and then try again compiling.. no need to include any file in keil.]]> contact@nospam.com (Ajay Bhargav) Tue, 18 Mar 2008 12:27:47 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html so u r saying i use the same file in keil only but just include tat fille reg51.inc
instead??? and tats it???nothing else i have 2 do??? and it work properly
with all the function n there will be no problems????
if tats there thanz... i wil test it out asap.. thank you..
I wasn't speaking about Keil.Rather ASM51 which you can use instead of RIDE.Do read the posts carefully.
Anyways for Keil do like Ajay says.]]> contact@nospam.com (Ajay Bhargav) Wed, 19 Mar 2008 06:44:36 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html i used keil and there is no warning anymore..
but it still isnt working it... it doesnt check for the second sensor
it checks the first sensor n goes to the up count n to the function upps and
to the func hex2bch n until high byte is 00 it stays in the fuction high_byte..
but after tat that the vistor count is becoming zero.. can u please check the
simulation using keil using the port simul.
and y we are putting 15h in value1 and in value2 during the program and making
them 0??]]> contact@nospam.com (Ajay Bhargav) Mon, 24 Mar 2008 08:05:48 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html can u please help me out with the above problem
i havnt put the code yet in the uC but while simulating yet..
but i cant figure out how 2 solove tat problem please....]]> contact@nospam.com (Ajay Bhargav) Wed, 26 Mar 2008 19:41:02 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html
Regarding this project, I am not the author of this project so I have least idea about why the values are being moved that way..!

I do not have much time to simulate this project, so i really suggest you to use RIDE for compilation.]]> contact@nospam.com (Ajay Bhargav) Thu, 27 Mar 2008 21:54:58 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html does it matter if u use 89c51 instead of 89s52????]]> contact@nospam.com (Ajay Bhargav) Sat, 29 Mar 2008 10:11:37 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html I'm not sure but i think author is using internal flash for storing visitor count. Please verify with the code
]]> contact@nospam.com (Ajay Bhargav) Sun, 30 Mar 2008 10:36:16 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html K1 - Relay
X1 - crystal
B1 - Bulb ]]> contact@nospam.com (Ajay Bhargav) Tue, 12 Aug 2008 06:13:33 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html transmitter n reciever part it would be a great help
and is there any changes in the code of this project?? or any
problems in the ckt???
please sir this is really urgent
if u can help me out please....]]> contact@nospam.com (Ajay Bhargav) Wed, 06 Aug 2008 02:11:03 -0700 http://www.8051projects.net/forum-t6450.html Re: Automatic Room light Controller with Visitor Counter (AT89S52) http://www.8051projects.net/forum-t6450.html
p/s:i don't know weither to reply to thread or post reply because i am a 'noob'..]]> contact@nospam.com (Ajay Bhargav) Tue, 12 Aug 2008 00:22:20 -0700 http://www.8051projects.net/forum-t6450.html