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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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2 Digit LED counter design help needed
A customer is asking for a product that I am
having trouble finding. I also might rather build it if I knew what was needed. Best way to explain is this: We've all been at a service desk where we've had to "take a number" to mark our place in line. Then they may also have a good sized digital display for the public to see which number is being served so you know your position "in queue". Well a customer (business) would like something like this where the employee can increase or decrease the displayed value (max of two digits) with the push of an up or down button . A clear or reset button would also be helpful. Another feature desired would be to "light up" another indicator, maybe the decimal point, on the display to indicate another condition that may become involved. Also it would be desirable to have a smaller LED display at the operator's desk to see and confirm the value being sent to the larger display which may not be easily seen from their location. I'm hoping someone here may have the knowledge to help me with a diagram and parts needed (maybe a source as well for the LED displays) With a schematic and any comments regarding the design, I think I could construct the project. Many thanks in advance ! |
#2
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2 Digit LED counter design help needed
Harlan wrote:
A customer is asking for a product that I am having trouble finding. I also might rather build it if I knew what was needed. It's pretty much an off the shelf item, I'm not sure why you would want to build it. A different system I have seen here (in Israel) at my HMO is a system where the numbers are displayed on an LCD computer screen. The system behind it is Windows (occasional BSOD), and they use some sort of screen multiplier device to get several of them. The post office uses the large LED dot matrix displays with an arrow to point to the open teller and a flashing light at the window. Very similar to a bank. It ALWAYS is out of sync with reality, it's impossible to tell if a person is just slow getting out of their chairs and getting to the window or they went home, or the numbers are out of sync, so the tellers go through them too quickly. :-( Geoff. -- Geoffrey S. Mendelson N3OWJ/4X1GM Those who cannot remember the past are condemned to misquote it. |
#3
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2 Digit LED counter design help needed
On 2/22/2011 9:05 AM, Harlan wrote:
A customer is asking for a product that I am having trouble finding. I also might rather build it if I knew what was needed. Best way to explain is this: We've all been at a service desk where we've had to "take a number" to mark our place in line. Then they may also have a good sized digital display for the public to see which number is being served so you know your position "in queue". Another feature desired would be to "light up" another indicator, maybe the decimal point, on the display to indicate another condition that may become involved. Also it would be desirable to have a smaller LED display at the operator's desk to see and confirm the value being sent to the larger display which may not be easily seen from their location. I'm hoping someone here may have the knowledge to help me with a diagram and parts needed (maybe a source as well for the LED displays) With a schematic and any comments regarding the design, I think I could construct the project. Google: "take a number" display Decide how much of your/his time/money you want to throw at the various solutions offered, there. |
#4
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2 Digit LED counter design help needed
"Harlan" schreef in bericht ... A customer is asking for a product that I am having trouble finding. I also might rather build it if I knew what was needed. Best way to explain is this: We've all been at a service desk where we've had to "take a number" to mark our place in line. Then they may also have a good sized digital display for the public to see which number is being served so you know your position "in queue". Well a customer (business) would like something like this where the employee can increase or decrease the displayed value (max of two digits) with the push of an up or down button . A clear or reset button would also be helpful. Another feature desired would be to "light up" another indicator, maybe the decimal point, on the display to indicate another condition that may become involved. Also it would be desirable to have a smaller LED display at the operator's desk to see and confirm the value being sent to the larger display which may not be easily seen from their location. I'm hoping someone here may have the knowledge to help me with a diagram and parts needed (maybe a source as well for the LED displays) With a schematic and any comments regarding the design, I think I could construct the project. Many thanks in advance ! Guess there are plenty of businesses selling shop- and couter furniture that can provide this type of equipment. You just have to find the right companies in your area. In my experience it is seldom worth the trouble to design a product that can be bought on the market. Nevertheless it can be done. You need a small box for the small display, the pushbuttons and a transmitter. Then a large box for a receiver and the large display. Plus a two or more wire cable between them. The electronics can be build using TTL or CMOS logic though I'd prefer microcontrollers. All the stuff you need can be bought on the internet. Farnell, Mouser and Digikey are only some of the providers. Of course I can build you a prototype for the friendly price of $400,- petrus bitbyter |
#5
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2 Digit LED counter design help needed
On Feb 22, 8:05*am, Harlan wrote:
Well a customer (business) would like [take-a-number display] where the employee can increase or decrease the displayed value (max of two digits) with the push of an up or down button . A clear or reset button would also be helpful. Another feature desired would be to "light up" another indicator, Also it would be desirable to have a smaller LED display at the operator's desk These systems are available pre-built, of course. For the displays, just buy a big bag of LEDs and connect series to make seven-segment displays of any size you want (it's relatively easy to find drivers for such things). For the 'other indicator' just pull more LEDs from the big bag. Prebuilt displays aren't anything more complex than that, just molded into a plastic block. And if a desk doesn't have easy view of the main display, consider the truck-mirror-addon convex mirrors at the local auto-parts store; hang a few in appropriate locations, and anyone's desk can have line-of-sight to the big numbers (though, mirror-reversed). If you want to get elaborate, you could put a CCTV camera on the main display and plop a few repeater screens around the office (or even in the restrooms and other places patrons might wander). |
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