Finally, all the boards had to be joined to make up the complete device.
Therefore, lots of cables had to be soldered at the correct positions
which became pretty messy towards the end. (Hint: Never make these
connecting cables too short. Always make them longer than needed.)
Furthermore, a good idea on how to put all these things into a hard
case had to be found. I chose a relatively cheap case from
Reichelt which was large enough for
all the parts. Since it had aluminium front and back plates,
I decided to line up the boards using 3mm threaded bars which was a
good idea. You can see the result in the image on the left.
The front panel was designed using Eagle. I printed the hole and description
layers to be able to drill the front panel holes for the LEDs and keys
at the correct positions. The PCB was fixed with several 2mm screws.
The 5 digit display is actually not soldered on top of the front panel
board but on a separate board behind the front panel and mounted on sockets.