Discussion in "Project Help" started by    13kelly    Jul 22, 2008.
Sat Aug 09 2008, 05:02 AM
here is a sample ciruit on how to interface a relay with oe port pin of the uC. Similar ckt can be used for the Horn/strobe .

strange: no attachment button :-s in reply?

[ Edited Sat Aug 09 2008, 05:03 AM ]
Sat Aug 09 2008, 02:34 PM
sorry pid33, it was just for security, you can now upload files.
Sat Aug 09 2008, 04:38 PM
thanks ajay,
here is the circuit.

 13kelly like this.
Sun Aug 10 2008, 06:15 PM
Thanks for the cct, and the help. :-)
I have been resting over the weekend here.
I will try to up load a revised diagram for criticism asap with a flow chart for operation.

Tags cctasap
Wed Aug 13 2008, 11:05 AM
pdi33 and Arun,
I am trying to get a final diagram together for this weekend so I can concentrate on my final exam.
I was looking at your Queing Display System Diagram project and was hoping if you could help me to use two Seven segment displays to display up to 60 minutes when €60 is validated and then decrement the timer when a start button is pressed.
There should be a second set of Seven Segment display to operate seperately to the first display when a room B button is pressed but do the same task, increment display during validation and start decrement by a seperate start button.
Does this need a seperate clock to run the second display unit?


This would make my project easier in that there would be no need for an LCD unit.
Wed Aug 13 2008, 02:12 PM

Hi Kelly,

Yes, you can have 2 set of timers running of the same clock,in that case there'll be total of 4 nos.of 7seg-displays ( two each for one countdown timer).

pl.go thru the following thread where i have discussed how to drive 10 devices using only one timer( each device operates at different duration) :


Thu Aug 14 2008, 11:28 AM
Here is a draft of the project so far.
Am I ok with the positioning of the 7 segment units?
How would I choose between activating display 1 and display 2 prior to validating notes.do I start the countdown for display 1 and for display 2 seperately?
Could you help me with code to set up 1 minute routine, 5 min routine, 20 min routine and 50 min routine.?


Thank you
Thu Aug 14 2008, 03:37 PM

Hi Kelly,

Here is a draft of the project so far.
Am I ok with the positioning of the 7 segment units?

i can't see it ............
Thu Aug 14 2008, 04:07 PM
Have attached the diagram as a word doc.
Hope you get it this time.

Thu Aug 14 2008, 07:56 PM
hi kelly,
i think u missed out on the instruction below the reply window.
it instructs as below:

Please note
Allowed file types: | .zip | .gz | .jpg | .png | .gif | .rar | .pdf |
Any other file types uploaded will be instantly deleted.
Maximum file size: 2M "

please convert ur format from doc to any of the above mentioned formats and post it on this thread.Please do not create multiple threads.
I am deleting the duplicate thread "draft2" u had created as it too did not contain the required document u seem to have attached (again i think in .doc format).

U can always download 'winzip' which is shareware and use it to compress the file to zip format before attaching it.

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