Using S10917-35GT 3-Channel Photodiode with 4:1 Multiplexer for RGB Sensing?

Hi all,
The circuit is designed as a colour sensor, using a 3-channel output photodiode to detect the RGB light intensity.
In order to save component costs and in an attempt to produce a more compact solution, I included a 4-1 multiplexer to switch between the 3-channels of the photodiode sensor
Please do not be overly concerned about the PIC, I couldn't find the particular PIC I wanted so I just selected a random one. The pin numbers are wrong, but the pin names are correct.
I'm not sure if this multiplexing would work, can someone please point me in the right direction?
p.s. the power supply consists of 6V AAA batteries with PC78L05 as a low dropout regulartor
The 3-channel output sensor used is s10917-35gt
Thanks!!!

This sounds correct, I made one of these last year very similar. Be careful of polarity crossing.

I would use a different regulator for a battery application. You probably mean the uPC78L05, and it has a 2.3ma nom (5.5ma max) quiescent current, which is high for a battery application. Plus, it has a 2V dropout, so it isn't LDO (infact, in you application, 6V isn't high enough to get a regulated 5V out of the 78L05). A better choice would be an LP2950, but there are many choices!