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Cheap, easy to use, useful
Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
Pros:* Nice clear display even at low brightness.
Cons:* Display and buttons on one board and controller.
* easy to control
* daisy chaining of multiple boards!
* TM1638 chip is easy to control
* at full brightness there is a significant voltage drop over the cable.
OtherThoughts:* bit hard to find the datasheet. Google is your friend and a good translated datasheet is available.
* no schematics so figuring out what segment and button maps to where is a bit of a hassle but doable with some effort.
* high IDC connector headers prevent easy integration with a frontpanel.
* Low buttons make it hard to put it in a frontpanel.
Low cost display that can be used in a lot in a lot of homebrew electronics projects. Beats the clarity of a 2*16 LCD display and has extra buttons.
Bottomline:The daisychaining is a nice feature.
Cheap, clear, easy to control. They can be used in many projects. So get a few, for this price its hard to make it as cheap as this.