Effect of Light Source Distance on Light Dependent Resistor (LDR) for Turbidity Measurement in Frog Nursery Ponds
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Abstract
This study evaluated the suitability of a light-dependent resistor (LDR) for developing a turbidity measurement instrument for frog nursery ponds. A 5 mm LDR, model 5528, was used in a PVC apparatus that allowed adjustment of the distance between the light source and the LDR at intervals of 10, 20, 30, 40, and 50 centimeters. Standard turbidity solutions of 15, 30, 45, 60, and 75 NTU were used. The resistance values in the LDR circuit were measured using a multimeter, and the obtained resistance values were used to create linear regression equations. The study found that distances of 10 and 20 centimeters between the light source and the LDR were optimal for developing the turbidity measurement instrument for frog nursery ponds. The linear equations derived were y = 84.13x + 1,254 and y = 64.88x + 1,841 with R - squared values of 0.994 and 0.990, respectively. The R-squared values close to 1.000 indicate a strong relationship between the independent and dependent variables.
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