i want to build a large 7-segment clock. since most 7-segment parts are fairly small, i was thinking about building my own 7-segment unit with blue leds. each segment would have 2 to 3 single leds (depends on how bright they are and how even i can distribute the light). it would look like someting like this:
o o o o o o o o o o o o o o o o o o o o o
the segment should be about 15cm high. i would need four of those segments (hrs/mins) plus two leds for the blinking seconds between hrs/mins. each led array would be in a separate compartment to 'simulate' the different segments. it would be really cool if they could dim depending of ambient light.
i'm more of a programmer than a hardware guy an need someone to point in the right direction ;)
as far as hardware goes, i have the leds (+resistors), an arduino mega, arduino nano, a DS1302 CMOS RTC Realtime-Clock, 10x 74HC595 shift registers and 1x MAX7219 led driver.
i was thinking about wiring each 3 led array in series and then creating one logic 1 x 7 array (the one column is actually 3 leds in series) to be controlled by a 595. does this make sense?
i'm not so sure about the power setup. could the arduino power all the leds?
any help is appreciated.