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 Posted - 16/11/2007 : 09:45:12 AM
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Posted - 27/11/2007 : 11:35:39 PM
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Can LDRs work properly using simple torchs,insted of lasers,in this project?
What is the actual purpose of 555 timer?Is it to produce a simple clock? Can't we use timer in 8255?
Also,can you explain me what actually the whole circuitry (mainly 555s circuitry) doing?
It will be really very helpful if cleared all my doubts.
Thanks |
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Country:  India ~
Posts: 8 ~
Member Since: 13/10/2007 ~
Last Visit: 29/02/2008
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Posted - 27/11/2007 : 11:40:07 PM
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| Can you estimate total cost this project will require? |
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Country: India ~
Posts: 8 ~
Member Since: 13/10/2007 ~
Last Visit: 29/02/2008
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Posted - 28/11/2007 : 09:55:48 AM
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Using Laser torch is best than using a simple torch.
The timer is to generate clock pulse when the LDR is interrupted.
The components cost will be around Rs.200-300. excluding the trainer kit.
J.Binu
Click here to buy fully finished MIcrocontroller Project Kits |
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Country: India ~
Posts: 478 ~
Member Since: 01/06/2007 ~
Last Visit: 22/08/2008
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Posted - 29/11/2007 : 1:22:17 PM
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But its not quite feasible for a student to buy laser torch.
Can u tell me a good alternative to laser torch?
bye |
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Country: India ~
Posts: 8 ~
Member Since: 13/10/2007 ~
Last Visit: 29/02/2008
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Posted - 29/11/2007 : 1:23:19 PM
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which a student can buy.
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Country: India ~
Posts: 8 ~
Member Since: 13/10/2007 ~
Last Visit: 29/02/2008
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Posted - 29/11/2007 : 3:32:01 PM
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Posted - 11/01/2008 : 12:44:12 AM
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actually the surface area of LDRs being small & the laser beam also being concentrated,how can this apparatus be hold as a small disturbance of ldrs or laser may cause the difference of light falling on it hence changing its resistance?????????
also as there should be some distance between the two LDRs(supposedly 1/2 mtr)hw can this be adjusted??????????? |
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Country: India ~
Posts: 5 ~
Member Since: 10/01/2008 ~
Last Visit: 14/01/2008
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Posted - 11/01/2008 : 08:52:42 AM
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Fix the LDR & Laser light rigidly with some glue or something.
Not 1/2 mtr accurately, but is should be approximately 0.5meter. |
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Country: India ~
Posts: 478 ~
Member Since: 01/06/2007 ~
Last Visit: 22/08/2008
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Posted - 14/01/2008 : 11:26:50 PM
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but hw can a circuit be kept so wide apart on pcb or breadboard?
also since 555 acts in comparator mode shouldn't it give pulse at pin no 3 when ldrs r interupted.its becoz i wasn't able to see this pulse on CRO. |
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Country: India ~
Posts: 5 ~
Member Since: 10/01/2008 ~
Last Visit: 14/01/2008
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Posted - 17/01/2008 : 01:18:38 AM
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wat r the operands in FOLLOWING INSTRUCTIONS
4114 MVI A ,01
4116 MVIC ,03
4118 CALL 0005
LIKE 01,03&0005
'CALL 0005' is basically for what?
also what is OK & NOT OK in FLOWCHART?????????????????
HOW MANY NUMBER OF PEOPLE CAN THIS PROJECT count?(FFH)
ALSO WHY did u store 00h at 4201 & 4202.
plz do reply my questions a s in I need to start them as early as possible.that will be very nice then.
thanks
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Country: India ~
Posts: 5 ~
Member Since: 10/01/2008 ~
Last Visit: 14/01/2008
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Posted - 17/01/2008 : 01:29:21 AM
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You can use either a bread board or solder it on a general purpose PCB
The 555 wont give a pulse, its output will be +5v if the LDR is in dark and the o/p goes to 0v if the LDR is in light.
quote:
'CALL 0005' is basically for what?
Which trainer kit you are using, this call function is to display the numbers on the trainer kit seven segment display. Its the inbuilt routine for VI microsystems traniner kits.
OK is for the sensor is not obstructed and NOT OK is for the sensors being obstructed.
This program can count a maximum of 255.
quote:
ALSO WHY did u store 00h at 4201 & 4202.
It is to clear the visitor count.
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Country: India ~
Posts: 478 ~
Member Since: 01/06/2007 ~
Last Visit: 22/08/2008
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Posted - 21/01/2008 : 10:50:01 PM
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thanks alot for helping me so much.there r sm other problems also that im looking forward to b solved.
thanks in advance
wat r the operands in FOLLOWING INSTRUCTIONS
4114 MVI A ,01
4116 MVIC ,03
also my question is why all three addresses(4200,4201,4202)r used to clear the counts?
411D STA 4200 32 Clear the count
411E 00
411F 42
4120 STA 4201 32
4121 01
4122 42
4123 STA 4202 32
4124 02
4125 42
my kit is Vinytics
VMC-8506
MICROPROCESSOR TRAINING CUM-DEVELOPMENT KIT
I think for displaying data field in my kit the program should be
STA 27F6
CALL 06FA
WHERE LOCATION 27F6HAS GOT THE CONTENT'CURRENT DATA'
&ADDRESS OF ROUTINE TO MODIFY DATA IS 06FA(ALL REGISTERS AFFECTED)
(its also written in manual that if the system is under control of keyboard,it displays 8 bit number in 27F6 )
thanks alot once again |
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Country: India ~
Posts: 5 ~
Member Since: 10/01/2008 ~
Last Visit: 14/01/2008
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Posted - 22/01/2008 : 9:10:48 PM
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4200 has the real count of the visitors in Hexa-decimal. This HEX value is converted into Decimal and the lowest number is stored in 4201 and the highest number is stored in 4202.
For example if the count value is 0A, then
4200 = 0A
4201 = 00
4202 = 01
Go through the manual of your trainer kit for the inbuilt monitor routines to display a number on the 7-seg display. |
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Country: India ~
Posts: 478 ~
Member Since: 01/06/2007 ~
Last Visit: 22/08/2008
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Posted - 22/01/2008 : 11:50:16 PM
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Can u please answer
wat does the operands(01,03) in FOLLOWING INSTRUCTIONS means?
4114 MVI A ,01
4116 MVIC ,03
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Country: India ~
Posts: 8 ~
Member Since: 13/10/2007 ~
Last Visit: 29/02/2008
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