EEVblog #298 - Dave's Decade Digit Display - USB Supply Part 3

[Dan Budd]

G-Day mate!  (Trying to speak the local language. Hope I did it right!)

I have enjoyed watching your video blogs.  I have been watching them in order (skipping over the one's I'm not interested in) and have arrived at #298.

Question:  In this blog, you are selecting the size of the enclosure.  How do you engineer a solution to the chicken and egg problem?  The size of the enclosure is determined by the size of the board. The size of the board determines the size of the enclosure (mounting holes to match mounting bosses).  Given a schematic of parts, how do you select the size of the box?

Another question/suggestion:  You also make reference to selecting your micro controller based on driving six 7 segment displays directly from the processor. That's a lot of I/O.  At the risk of offending your parts budget (and adding to your parts count), would using an I2C LED driver such as AS1115-BSST to handle the display help?