Hello hello nerd farmers!
I am a middle school science teacher. My students and I were able to get out hands on a high end PAR meter to measure the light intensity of the LED panels in our vertical hydroponics system. Given the expense, we have been trying to see if we can get some standard data of values within the system and compare them to the analog readouts from an LDR running on an Arduino sketch.
The goal is to derive an equation that will convert LDR values for this panel into PAR readings. We have four readings at the moment, but intend to gather more. The raw data is as follows
PAR meter readings: 770.1 , 530.8 , 294.1 , 105.2
Correlating LDR readings: 1104, 997, 985, 945
I have some very bright young people working on the math and I want to give them a chance to hash this out. I suspect this data set shows an exponential relationship. Any insight from the forum on how to derive the conversion equation so we can hand this off to the arduino? Thanks a bunch.