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Presettable 3 digit Counter

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Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph

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SVHANS

Mon Jun 23 2008, 06:32PM

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Arun,

the easiest way would be, it has a green led on when its running and the red one on when it stops. i want it to count when the red led comes on. Hopefully thats possible.

Arun Kumar V

Mon Jun 23 2008, 07:31PM

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Perfect !

thats possible, there are two ways to interface the Red LED on the equipment to
micro:

1) using a optocoupler like PC817/4N35, if LED can be removed from its hole/socket along with its wires.

2) using an LDR, a black opaque tube with LDR at one end is fixed onto the Red LED and when the red Led glows the LDR sends a pulse.

we have enough inputs to start the project.

before we proceed further you may want to check the availability of components in your local electronics stores,

first would be the micro : Atmel's 20 pin AT89C2051,

second - suitable Programmer which can program the AT89C2051( i remember you saying you have a person who knows stuff at your disposal) ask him if At89C2051 can be programmed by his programmer..........................

once you confirm these i can proceed to write code for your task.

Arun

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SVHANS

SVHANS

Mon Jun 23 2008, 08:22PM

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Arun,

i can easily access the LED and its wires.

I can also source the At89C2051 and our programmer is capable of progamming it.

Thanks.

Arun Kumar V

Mon Jun 23 2008, 10:37PM

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Right O, then !

i' ll give you full code and schematic in a day or two - so stay tuned ..............

and don't forget to press the Thanks button, if the replies helped you !

Arun

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SVHANS

SVHANS

Mon Jun 23 2008, 10:40PM

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Arun,

If you can provide me with the code and schematic, there wont be enough thanks buttons!!!! LOL

Arun Kumar V

Tue Jun 24 2008, 01:38AM

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Hello Stu,

as promised, heres my Schematics for both Counter board and Display Module:

2-digit_counter.rar

i am writing the code for both the circuits, i need few inputs like :

1) when you say the RED LED glows on when the machine stops, does it stay that way till the machine is started again or it just comes on and goes off after few seconds ?

2) do you want to count down ( 99 to 00 ) or count up (00 to 99), with the count up timer (00 to 99) you have a added benefit to display "E" on 100th count.

Arun

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SVHANS , marai

SVHANS

Tue Jun 24 2008, 02:55AM

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Arun,

the LED goes on then turns off after a while.

I'd like it to count from 99 to 0 then instead of an E maybe - - the centre LED segment on both LED displays?

thanks heaps foir your help so far!!

Arun Kumar V

Wed Jun 25 2008, 06:40AM

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Joined: Sun Jan 28 2007, 11:50PM

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Hello Stu,

after 2 days of hardwork on your project here are the pics of the project, i have tested the project on the test bench:

since i had only one 7 seg display at the time of testing, i used a SPDT switch to flip between 1st digit and 2nd digit.

i made some abbreviations on the display like:

1) nC = not connected
2) En = End, needs to be reset.

the codes on the two micros worked well but, i am having second thoughts on the serial link .
3 wires between the two cannot be interrupted i,e if the link is pulled out and reconnected the count doesn't advance and both micros have to be reset.

after seeing this practical problem i suggest the solution in my second post with 12 pin connector or you can have display and counter on one single board and each one of these boards on each machinery.

let me know your opinion and don't worry about my time and efforts spent on this solution .

Arun