Will this colour sensor work with multiplexer?

[mereldawu]

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!!!

View attachment 41728

 

[Hero999]

It seems like an overly complicated way of doing this.

I think you should drop the MUX and three channel photodiode, use a single channel photodiode and turn the LEDs on, one at a time and take an intensity measurement for each colour.