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

Wed Mar 04 2015, 11:57 AM
Shoukat
What is general purpose card used in metro train prototype.waht is its functionality?
ajay_bhargav
Wed Mar 04 2015, 04:49 AM
@candyyyy, If its about LCD then you can pull down with 1K resistor. dont leave it open
Tue Mar 03 2015, 06:59 AM
candyyyy
Hi! Can i ask how do you connect the Vo contrast pin? Do i leave it open?
ExperimenterUK
Sun Mar 01 2015, 07:06 AM
@Anupam Biswas..post all you have done in the GSM forum
Sat Feb 28 2015, 02:51 PM
Anupam Biswas
I am doinga project on gsm based home automation.I have done alittle study about at commands.I am using Atmel 89c51 with yhe gsm module.I am unable to receive any message via the module.The simulation is done on proteus and i am using a virtual terminal.Can anyone please help me?Thanks in advance.
Tue Feb 24 2015, 12:47 AM
MrCurious
is Stat a global variable too? you reference it in Chan's "disk_status" function.
Sat Feb 21 2015, 09:10 PM
Harikumar
കൊള്ളാം
ExperimenterUK
Fri Feb 20 2015, 06:28 AM
@sugikz.. I have asked Ajay about it, he'll soon sort it out
Thu Feb 19 2015, 12:22 PM
sugikz
"Sorry no bots allowed! You entered two different email addresses. Please enter a valid email address in the two fields provided"
Thu Feb 19 2015, 12:21 PM
sugikz
this are the problem notice box;

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ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Mar 06 2015, 06:41 PM
The LT3652 is an intelligent charger.It monitors t...
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Posted By steve_yu_chan
Wed Mar 04 2015, 02:55 PM
As per the datasheet, if you want to operate load ...
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Posted By ajay_bhargav
Wed Mar 04 2015, 04:51 AM
As per the datasheet, if you want to operate load ...
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Posted By steve_yu_chan
Wed Mar 04 2015, 04:18 AM
yes, i following the data sheet typical applicatio...
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Posted By ExperimenterUK
Wed Mar 04 2015, 01:38 AM
I follow the LT3652 data sheet (page 26) to connec...
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Posted By steve_yu_chan
Tue Mar 03 2015, 04:32 PM
Dear All ,can you help me to solve the regarding t...
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Posted By ABiDAEV
Sun Mar 01 2015, 11:42 AM
Thanks for sharing, but can you please update the ...
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Posted By sankalp_s
Thu Feb 26 2015, 09:27 PM
What are you trying to make ?ExperimenterUKsir i w...
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Posted By ExperimenterUK
Thu Feb 26 2015, 12:58 AM
We seem to be moving away from the original projec...
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Posted By ajay_bhargav
Wed Feb 25 2015, 02:02 PM
You will need a 64 bytes buffer that will be writt...