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Concrete LED Light Cube
Yes for this you need to calibrate with samples of which you do know the ppm!
The Particle Photon delivers values on a scale of 0 to 4096. The LDR measures the light. Completely dark will give a value of 4096 and completely light will give 0. Because of inaccuracies our clear water value is already around 2700. Is this what you asked for?
How to Make: Water Turbidit...View Instructable »