The 3 amplifier circuit does not look like it will work. All three diodes are in parallel. What effects one branch will effect all branches. If this is what you want, just use one op-amp. It will do the same thing.
Why not use 3 seperate photo diodes with seperate op-amps?
That was his idea of how they should be connected. The datasheet he linked to clearly says the three diodes have a common anode connection, with the cathodes on separate pins.
The 3 amplifier circuit does not look like it will work. All three diodes are in parallel. What effects one branch will effect all branches. If this is what you want, just use one op-amp. It will do the same thing.
Why not use 3 seperate photo diodes with seperate op-amps?
OK, here's a place to start. You will have to play with the feedback resistor and capacitor. I have a feeling the resistor value may need to be in the megohms.
CAVEAT: I have never used the ATmega88, the LTC6082, or your photodiode.
But it's better than what you have now.
The results I'm getting with the solution posted here are sorta like on off (Any light at all and the output goes low. With no light the output goes high. Very hard to reach a happy medium). I have a feeling it has to do with the resistor and capacitor in the feedback?
I'm wondering how I should go about selecting the proper resistor/capacitor combination?