looking to build or find inexpensive 3-digit 7-segment LED display

mad.scientist.jr · 2008-02-28T23:20:36+00:00

I need to display the numbers 0-255 in decimal on a 3-digit LEDdisplay for a microcontroller project (it would need to be visible inthe dark). Ideally the display would be inexpensive and not take uptoo many uC outputs, but what I am finding is expensive ($30 or more).Does anyone make an inexpensive 3-digit 7-segment LED module thataccepts serial input from say, a PICAXE or a BASIC Stamp 2? Also Ihaven't done anything using serial i/o yet but I saw some displaysthat had a "clock" pin (so the controller can sync up the data streamwith the module). Would I need to get a clock module for the basicstamp to talk to the display module? What would a good one be? Can youbuild a reliable clock for less using a 555 timer? I as thinking abouthow such a device might work without a clock and thought of a way todo it with 2 lines output, 0-0 would mean no data, 0-1 would mean herecomes some data, 1-0 would mean low, 1-1 would mean high. The displaymodule would consist of a microcontroller with 2 inputs and 12 outputs(3 groups of 4 outputs going to a 7-segment encoder IC to drive eachdigit). Is this a decent solution or unnecessary? Any advice or linksto a good example would be appreciated... Thanks.

Feb 28, 2008 22 Replies

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John Fields 18 years ago

http://www.allegromicro.com/en/Products/Part_Numbers/6275/6275.pdf http://www.allegromicro.com/en/Products/Part_Numbers/6276/6276.pdf

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JosephKK 18 years ago

Responding to some name faking twit i see. Check the headers.

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JosephKK 18 years ago

Talking up the to the sewer rat still? Check some more headers.

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