11.0 LED intensity, LCD Display contrast, Absorption Reading and Blank button boards.

pot button boards.JPGTwo more small assemblies were built for testing on the bench and now transferred to the prototype. On top are the blue and green LED intensity potentiometers to set the blank voltage readings in the range 600-900 units.  The bottom board has the potentiometer to adjust the LCD contrast, and the two buttons.  The top button takes the absorption readings for green and blue light, the bottom button takes the blank reading, which is the level of led light intensity in a sample of water without the indicator dye in it.


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