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

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ExperimenterUK
Mon Jan 07 2019, 11:31 AM
@REVOCATUS please post in the AVR forum
Mon Dec 24 2018, 05:25 PM
REVOCATUS MATEMU
sorry I mean referee boards for player substitution
Mon Dec 24 2018, 05:24 PM
REVOCATUS MATEMU
hi am.looking how to build referee by using Atmega 328 and its codes
Sat Dec 15 2018, 09:45 PM
Arslan ayoub
Hii ,, can I get the simulation of numeric keypad lock on proteus
ExperimenterUK
Tue Dec 04 2018, 01:17 AM
Please post questions in the forum. The chat box is for chat
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help!me!
help! I don't understand busy flag!
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ile
hello
Mon Nov 12 2018, 01:58 PM
Pavan_user
i have seen your replica of I2C programming using AT89C51 but i am unable to understand the "ack_bit" variable usage ...looks like it is always 1...can you elaborate how acknowledgment is working....
bgk3678
Tue Nov 06 2018, 10:36 PM
kindly any one give solution for my problem
ExperimenterUK
Tue Nov 06 2018, 05:48 AM
Pins high is the normal state. You need a program to set them low

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Which 8051 chip are you using ?
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