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Just plug in and play
Involvement:General (knows how to use it) - Ownership:1 week to 1 month
Pros:Very useful if you wan't to build something with an Arduino. Simple to use and probably has button debounce.
Cons:Except that the buttons aren't exactly aligned under the LED's there are none. But it's not a big deal.
OtherThoughts:Very grateful for the library of rjbatista which makes it easy to use this module. http://code.google.com/p/tm1638-library/
Bottomline:A really must have for Arduino beginners. In stead of all kind of PCB's with buttons or LED's which uses too many pins this one just uses 3 pins + 1 pin for each extra module.