Controller V 2. Mini Photometer for .01 unit pH accuracy with 434 nm,578 nm leds, TSL257 light sensor

Still obviously a prototype, shown above the controller V 2,  plastic case, arduino uno, 16×2 lcd analog display, soldered wirewrap construction.  This unit is used for all versions of the sample holder assembly. V1 -300ml jar following Bo Yang et al.,  v2 3ml cuvette experiment, v3 3 ml cuvette holder using scavanged HP cuvette holder.  v4 3 ml laser cut cuvette holder outsourced to Ponoko for material and laser cutting. (updated 26 may 2017).

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