project help

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
Thanks
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Posted by isha on Wed Jul 11 2007, 01:29 PM

project help

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 ... Read Compelte post
Posted by ajay_bhargav on Wed Jul 11 2007, 01:46 PM

automatic room light controller with visitor counter

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)
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Posted by Ritesh on Sat Jul 14 2007, 08:39 AM

automatic room light controller with visitor counter

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???????
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Posted by isha on Fri Jul 13 2007, 09:01 AM

10 New 8051 Projects

For all those students and hobbyists who are looking for microcontroller 8051 projects in assembly language. Ten latest projects based on 8051 are available for download. Here is the list of projects available.

1. Auto Control of three phase Induction motor (AT89C2051)

2. Automatic College Bell (AT89S8252 & DS1307)

3. Automatic plant Irrigation (AT89C2051)

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Posted on Wed Jun 06 2007, 01:45 PM

Conversation

ExperimenterUK
Wed May 25 2016, 05:05 AM
@ Ramanjaneyulu, post in forum,explain your problem
Mon May 23 2016, 11:34 PM
Ramanjaneyulu
Hi, I Am using at89c4051 for my application, I want 5u sec dely.. Up to 1milli sec iam able to producing delay. Beyond the 1milli second, I am unable to produce the acceurate dely. Plz any one help me
Sat May 21 2016, 09:51 PM
A K
i want to mak an auto dialer using gsm and atmega 16. please helpe me how to write a code to auto dial a number saved in sim
Sat May 21 2016, 10:42 AM
Alec
Hi im trying to program my 89s51 with a usbasp so any ideas on the circuit?
Wed May 18 2016, 10:08 AM
Tashu joshi
anyone know how to develop
Wed May 18 2016, 10:07 AM
Tashu joshi
i'm working for resporatry system using 8051,
Wed May 18 2016, 10:06 AM
Tashu joshi
i'm developing a respiratory system using Arduino
Fri May 13 2016, 11:03 AM
MEGHANA
i need c code for counting frequency of two sensors and compare these frequencies and it has to give high/ low signal after comparision
ExperimenterUK
Tue May 10 2016, 05:02 PM
@Suren ..create a thread in the 8051 Discussion Forum to discuss your problem
Tue May 10 2016, 04:04 PM
Suren Avushyan
how can I increment address not the content of it, like 0x70 and get 0x71

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zaft93
Sun May 15 2016, 01:52 AM
CELEBI
Thu May 12 2016, 08:28 AM
Suro1996
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yigithan
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jaque
Fri May 06 2016, 07:51 PM
afzal42
Wed May 04 2016, 11:16 AM
pd
Sun May 01 2016, 01:35 AM
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ExperimenterUK Avatar
Posted By ExperimenterUK
Sun May 15 2016, 10:58 PM
zaft93 Avatar
Posted By zaft93
Sun May 15 2016, 01:55 AM
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri May 13 2016, 07:59 PM
If you want only one relay to be on at a time the ...
CELEBI Avatar
Posted By CELEBI
Fri May 13 2016, 06:16 AM
Yes. It must be as you said. It must be 1.5 second...
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Posted By ExperimenterUK
Thu May 12 2016, 08:35 PM
Here is one way.If you have the Keil compiler you ...
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Posted By ExperimenterUK
Thu May 12 2016, 05:20 PM
Sorry I don't understand what you want.Is that 1.5...
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Posted By CELEBI
Thu May 12 2016, 08:53 AM
Hello Guys, I want to make a Project with 89s51 bu...
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Posted By ExperimenterUK
Wed May 11 2016, 09:28 PM
No this is all I've got, the algorithm I think is ...
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Posted By Suro1996
Wed May 11 2016, 09:27 PM
Is this all the code you have ?As it is, it will n...
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Posted By Suro1996
Wed May 11 2016, 07:31 PM
Hello, I am new to assembly programming and I am h...