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 2009-01-07T21:47:59-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 can u please explain me the working of the ckt diagram exp the part of thetransmitter n reciever part it would be a great helpand is there any changes in the code of this project?? or anyproblems in the ckt???please sir this is really urgentif u can help me out please.... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 ۞ TPS ۞ re-post/duplicate ? http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh no actually i posted on bothi just wanted to knw if possible if u can me with this projectn explain me the reciever side of the ckt please http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 sashijoseph The transistor is used more as an inverter......you need a low at the 555 reset pin when the output of the sensor is high and vice-versa.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 http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay ok i explain from room.giffirst 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 2555 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.gifit 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? http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh yes siri 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??? http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh i get tat when there a change.. in sensor it gives high to low pulse..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 2.2ufn y a period of 0.24secs as a pulse width???? tats where im little confused... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh and y have we added56K 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.. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay read about 555 timer.. and see how the value of Resistors and caps are calculated.whatever you mentioned in point 2 is correct...when interrupted you will get low. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh hello sir...i just wanted to the y 555 is giving a 0.242 secs of low op in the ckitand how did we arrive to tat value of 100K??? please sir can u reply me tatasap 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 notgiving any output whn it is interrupted?? thank youplease sir hopefully u can answer my doubts...thank you again.. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh ok sir..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 theuC 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 beingapplied to the ckt...and finally the use of 555.. its not clear.. can u pleaseexplain it to me... couldnt we have fun a lower time period of a low pulse than we have calculated... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh oh ok..so how does it work then.. if we cross both sensors thenhow 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 onn 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 ] http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh this is the error its saying and im using keil so tats y nothing seems to work.. and there might be a problem withthe seven segment code n the checking of the sensors... so can help me outthankz you... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh oh ok fine..so the transistor is used as an inverter n the time 0.24secs is just fixed by us.. oh ok thanz alot.. it makes the things more clear...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 darkabt tat part!!! thank you for explaining me tat much... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh i just wanna make everything clear...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 convertedinto high o/p from the transistor n the 555 gives a high o/p to the uC andit detects it as port 1 is needs 1 to act a input and increments the counter nturns on the lights?? tats how the project works??? correct!!! http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay I explained you the working after looking at the code. So the order is correct.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. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay you have to cross both the sensors while entering and while exit not just one.. ok? http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh hello 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 okwhn 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 highit just offs the light.. again... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay well i think you are confusing yourself and not getting the real thing.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 http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh oh ok thanz alot..sorry.. i wont do it again!!!1thanks alot u have helped me alot with all my doubts.. just one last questionswat 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... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 sashijoseph 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? http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh ok sure thanz.. alot.. so i was thinking it the other way around...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?? http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 sashijoseph See,there has to be some way to tell if a person has entered the room or left it,so that the visitor count could be correspondingly incremented or decremented.If only one sensor were used there would be no way to tell if an interruption occured due to a person entering or going out(and you can't have one sensor for incoming and one for outgoing since the entry&exit door is common). 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. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh can i some how forward u the code n can u tell me if its kinda correct or not?????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??? http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh can i email u the code???? if u dont mind?? plus the screen shot of the error to ur email???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... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay use RIDE instead of keil, coz the code is written for RIDE controller by raisonance.you can download a free evaluation version from http://raisonance.com/ http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh hello sirsir 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 reallyhelpful if u can quide me doing the changes in the program so it can work.. we have oursubmission of this project next week thank you very much.. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay yes its possible But you need to do test to check its working.. 95% it will work...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
 toCODE:;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.. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay just try compiling the program.. if you get any error then tell me.. will wait for your input. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh so i will run the program.. and let u knw by tomorrow.. asapok.. 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.. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh sir these are the errors im getting from using an ordinary assemblerits 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_3as its never been used along with different parameters as u can see in the lst file..i have added $mod51 to it also... so yeahw/o using $mod51 its giving me more errors where equ have been defined. and whn its being usedagain.. so.. yeah.. tats it. thanz you...but its not giving me any warning tat memory overlapping memory.. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 sashijoseph If your RIDE is crashing you may send me the asm and I'll build the hex for you.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". http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh sashi joseph where shld i email u the program????can u tel me tat.its giving me a warning message of memory overlaping in keil so.. which email??? can u tell me.. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh sir i have attached the files to it...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 onn off of the light.. so tats the only problem which is the major one thanz u. sashi joseph sirhope u can get the file in this attachment... thanz you... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 sashijoseph Here's the Hex.Oops...binaries not allowed. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 sashijoseph Here's the Hex. light.zip http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh hey can u send me the program which used to compile this hex filealong with asm n .lst file.. pleasewas there any memory overlapping warning showing?? when u compiled ordebugged the program??? please can u tell me tat much and send me theattachment 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 alsoplease.. as we are only using kiel in our college for uC 8051.. so yeah thanzi will load the micro-controler with this hex file n let u knw.. thanz... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh so u r saying i use the same file in keil only but just include tat fille reg51.incinstead??? and tats it???nothing else i have 2 do??? and it work properlywith all the function n there will be no problems????if tats there thanz... i wil test it out asap.. thank you.. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 sashijoseph Well I've used RIDE for building.But since RIDE's not working for you,ASM51 could be used instead.It's a small download.Link : 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 http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh its not a problem for compling its giving me a memory overlapwhich is overlapping and hence there is a problem in the workingof the program.. and so therefore nothing seems to work tats the problem we are having.. tats the problem... there is no errorsjust a memory overlapping problem which is seen in keil and thereforenothing is working the couter or the turning on n off the lights and everything http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay all the variables with DS 1,make them equ with ram address.. e.g.changeabc DS 1def DS 1ghi DS 1toabc equ 30Hdeg equ 31Hghi equ 32Hand then try again compiling.. no need to include any file in keil. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 sashijoseph so u r saying i use the same file in keil only but just include tat fille reg51.incinstead??? and tats it???nothing else i have 2 do??? and it work properlywith 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. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh ajay sir..i used keil and there is no warning anymore..but it still isnt working it... it doesnt check for the second sensorit checks the first sensor n goes to the up count n to the function upps andto 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 thesimulation using keil using the port simul. and y we are putting 15h in value1 and in value2 during the program and makingthem 0?? http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh ajay sir...can u please help me out with the above problemi havnt put the code yet in the uC but while simulating yet..but i cant figure out how 2 solove tat problem please.... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay In the mean time can you compile the original program using RIDE (www.raisonance.com)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. http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 saxenanitesh hey does it matter if u use 89c51 instead of 89s52???? http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay you need to check the code, see if there is any controller specific code writter by the author. If thats not the case then you can use controller you want.I'm not sure but i think author is using internal flash for storing visitor count. Please verify with the code http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 Ajay U1-U7 - ICsK1 - RelayX1 - crystalB1 - Bulb http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 chintu21 can u please explain me the working of the ckt diagram exp the part of thetransmitter n reciever part it would be a great helpand is there any changes in the code of this project?? or anyproblems in the ckt???please sir this is really urgentif u can help me out please.... http://www.8051projects.net/forum-t6450.html 2009-01-07T21:47:59-08:00 youth69 i am sorry if my question is kinda silly but i have no choice than asking(because i am lost..hihi).. based on the schematic diagram of the circuit..can you tell me what are the components labeled with U1-U7,K1,X1(a type of crystal is ist?)..and B1.. thank you p/s:i don't know weither to reply to thread or post reply because i am a 'noob'..