I am trying to get the transmittance through various liquid samples using specific wavelength LEDs. Originally I was experimenting with photodiodes, but do not seem to be ideal.
The target color range is near UV / Violet and Blue (~400-550nm). I am attempting to source a CMOS image chip that I can experiment with and am not sure as to which requirements I am looking at.
The basic requirements would be: Drivable with an atmel (Xmega, Atmega, etc). I think ARMs are more standard, or FPGAs but in terms of cost and programming complexity, would prefer to stay within microproc. territory.
Essentially I intend to sample the light from the LEDs with the intent of processing with an FFT algorithm in order to detect frequency components. A standard supported protocol like i2c or similar would be nice. Working with an AVR dragon.
Essentially help to find out what the important criteria in CMOS selection are.