Discussion in "Project Help" started by    isha    Jul 11, 2007.
Wed Jul 11 2007, 01:29 PM
sir, i've a question related to the project named 'Digital Visitor Counter', that ''what type of sensors are used in this project" , complete information about these sensors..... reply me as soon as possible
Tags Digital Visitor Countersensors for Visitor counter
Wed Jul 11 2007, 01:46 PM
Thank you for posting it here.. this is going to help others too
so, regarding the sensors, in the project, LDRs are used. LDR = Light Dependent Resistor
There are two LDRs in the circuit, one is on the exit door and on the entrance door.
So when someone crosses the entrance door, it counts the visitor up and when someone crosses the exit door, it decrement the counter.
Timer is setup to refresh the 7-Segment display.
Hope this information is sufficient for the project. If anymore info is needed feel free to ask
 Halley like this.
Tags Digital Visitor Countersensors for Visitor counter
Sun Dec 21 2008, 11:26 AM
The visitor counter isnt working, some problem in the cde.... the rxd port is not read....
Sun Dec 21 2008, 11:29 AM
I want to shift the inputs to some other port so I can serial port it....
But the circuit code only increments and doesnt decrement....
Sun Dec 21 2008, 11:33 AM
whats the exact problem? are you sure your hardware is ok?
Sun Dec 21 2008, 11:43 AM
i simulated the code on software to make sure its working before i shifted to hardware, and it only increments and doesnt decrement.... sensor circuits work on software... i tried it on hardware and I cant get my sensors to work, but im going to get something of better quality...
the problem seems to be in the rxd port... its not read...

[ Edited Sun Dec 21 2008, 11:54 AM ]
Sun Dec 21 2008, 12:33 PM
how did you make sensor circuit? using switches? which software are u using for simulation? send me hex + ckt if proteus.
Sun Dec 21 2008, 12:59 PM
Your post is not clear.
You're saying it works ok in simulation but not in hardware?
Or it doesn't work in either?

You must remember....for incrementing,the sensor at P3.0 must be obsteucted first and then P3.1
For decrementing,P3.1 must be obstructed first and then P3.0
Fri Jul 17 2009, 01:57 AM
sir in this circuit .how relay will be connected..it is of five pin..but in circuit it is not clear how to connect,..plz help
Sun Jul 19 2009, 06:20 PM

sir in this circuit .how relay will be connected..it is of five pin..but in circuit it is not clear how to connect,..plz help


i saw the circuit and its all clear, your coil is connected with one pin to VCC and other to Q1 transistor.

NO(normally open) is connected to bulb and NC(normally closed) is not connected.

common pin is connected to AC supply.

what is not clear to you, please mention.

One suggestion is to open up a new thread for yourself instead of posting in a thread which is months old

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Thu Jun 11 2020, 06:27 AM
sir could please send the code for I2C and wifi interfacing with 8051
Tue May 19 2020, 10:29 PM
Does anyone have microcontroller programming software for STC15F104W (core 8051, 4 k, 128 byte, 6 I/O pin, UART ... DIL8), that works?
Sat May 02 2020, 07:38 PM
Tamu Gurung
Hi I am looking for a assembly language program for a digital decimal counter. Time counts max limit of 2 mins starting from 2.00 mins and ending at 0.00. time is to be displayed on 4 7-segment LED displays. Edsim51 simulator to be used. Thanks
Wed Mar 25 2020, 01:39 PM
Sir kindly send the code file i2c for 8051
Fri Mar 13 2020, 10:36 PM
@ Rohitnani,ABEBE..which project ?
Fri Mar 13 2020, 12:55 PM
how can get hadwere of this project
Sat Mar 07 2020, 05:11 PM
Sir, Could you please send me the zip file input password....
Wed Feb 26 2020, 04:58 PM
Peter Parker
Is it possible to send multiple messages using only 1 GSM module?
Sat Feb 01 2020, 10:12 AM
Pearl Olin
Wed Jan 22 2020, 06:16 PM
I m getting errors while simulation process during interfacing socket output and lcd... Can i get the report of ur project which is same as us.



Thu Jun 25 2020, 03:46 PM
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Sat Jun 13 2020, 09:43 PM
Thu May 21 2020, 12:44 PM
Thu May 21 2020, 01:28 AM
Wed May 20 2020, 07:05 PM
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