Sonic Screwdriver

so I never really figured out until now, how i would want to place so many parts on the board, but this picture might describe best, what I'm up to or will be.

I just had a great idea, how I could show in which menu state I am. I will use a 5 LED bar graph showing some stuff like transmitting channels, but this can also be used as a 5 LED POV display as well! This will automatically lead to wildly move around with my sonic, so this seems pretty authentic as well ;) 

So I checked my box with all the materials I gathered so far, and it seems I could easily build 2-3 of the same functionality. 

I also designed a charlie-plexed pcb for the 5 led bargraph so it only needs 3pins, as I won't have that much free anymore. The circuit can be found here. http://123d.circuits.io/circuits/204380-5led-bargraph-charlieplex

Fiddling with three LEDs with 10 legs total can be frustrating and leads to virtuos deadbug designs - resistors not even included, so today I took some time to design this pcb. The next design will be a board with an ULN2003A on, to drive the LEDs and an input board with three buttons and resistors, maybe in a sandwich methode, buttons on the upper side, driver on the bottom.

http://123d.circuits.io/circuits/210998-sonic-screwdriver-dome

While searching for darlington arrays I found an interesting german page about a gamma ray detector using a photodiode and an darlington circuit. I still have one channel free on my LED driving IC and the used diode is not expensive.

http://www.b-kainka.de/bastel131.html

http://www.elektronik-labor.de/Projekte/Alpha.html

https://www.sparkfun.com/datasheets/Prototyping/Solar/bpw34.pdf

This is a table with some possible combinations for the sonic screwdriver.