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MaE Counter Panels
These are two big panels, each one providing 8 red and 8 green numbers of 3 digits of 7-segment displays.
Purpose and requirements
These “Counter Panels” have been developed for the easySagra project.
We needed a way to display the number of ordered articles (thus “counter”) in two different panels.
A TV flat panel was a direct solution, however not the best. Main requirements were:
* Ethernet link, possibly in only one object; * Mechanical robustness to frequent mounting/unmounting/transporting; * Mechanical robustness to hard environment (heat, moisture, oily smokes, etc); * Indicate 8 different articles, for each two different values ranging (1-999), thus 16 numbers of 3 digits, half for color; * Minimum dimensions such to ensure visibility from 4-6 meters of distance.
Development
Entire development has been made using Open Source Software. Exception for the initial sketch, made using google sketchup in wine environment.
Chassis
Chassis has been designed using QCad. Main issues: easy assembly and disassembly, sufficient air flow, mounting points for all the contents.
Displays
Each couple of displays (red and green for simplicity), is provided by a separate PCB.
PCBs have been designed using gEDA PCB. Then have been realized by professional service.
Main board
An ethersex based board have been used as main board and ethernet interfacing. A simple module has been written to drive display boards.