Automatic Room light Controller with Visitor Counter (AT89S52)

Sir. I want to do project on 'Automatic room light contoller with visitor counter'. But the circuit is not clearly visible to me. So can u send me clear circuit?

r.d.anjariya

Click here for circuit
http://www.8051projects.info/files/room.GIF
http://www.8051projects.info/files/room1.GIF

J.Binu
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sir, i am a beginner .. i would like to know how this counter works ? also why there are two sensors. and also on how to program the ic ?


PRAVVISH

There are 2 sensors, one for up counting and other for down counting.
To program the IC you need a microcontroller programming kit. please visit our kits page for more details.

J.Binu
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hello,
i am really confuse in the connection of 7 segment display with the microcontroller. please help me. i mean to say 'a' of 7segment is connected to which pin of microcontroller etc

I cannot understand the purpose of using DS 1 in the coding. i cannot find about it in any book. can you tell me any web from which i can learn concept of ds in assembly.

DS Directive

The DS Directive is used to reserve space in the currently
selected segment in byte units. It can only be used when ISEG,
DSEG or XSEG are the currently active segments. The location
counter of the segment is advanced by the value of the directive.
Care should be taken to ensure that the location counter does not
advance beyond the limit of the segment.

The format for the DS Directive is: optional label, followed by
one or more spaces or tabs, followed by DS, followed by one or
more spaces or tabs, followed by a number, arithmetic expression,
or previously defined symbol (no forward references allowed),
followed by an optional comment.

Below is an example of using the DS Directive in the internal
Data Segment. If, for example, the Data Segment location counter
contained 48 decimal before the example below, it would contain
104 decimal after processing the example.

DSEG ;Select the data segment
DS 32 ;Label is optional
SP_BUFFER: DS 16 ;Reserve a buffer for the serial port
IO_BUFFER: DS 8 ;Reserve a buffer for the I/O


Taken from the 8051 Assembler mannual from metalink assembler.

J.Binu
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hello,
sir what is the purpose of using reg_51.pdf file as a header in coding. and u havent define the connection of 7segment. please mark a b c d e f g connection on the coding.

.hello,
sir i cannot open the file reg_51.pdf because adobe reader is giving error that it is either not supported or file is damage.please give another link

Open it with notepad.

J.Binu
Click here to get free 8051 Codes