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Transcript
Course: Embedded Systems and Software 55:032 Instructor: Dr. Anton Kruger Abhijeet Kher Aakant Taurani Why is measuring water turbidity important? Particles can be suspended in water Test for water quality Clear water is not always clean water Drinking dirty water can cause many GI and other health problems Especially a problem in developing nations Cost Our Project Source: http://www.nextag.com/turbidity-meter/shop-html ~$60!!! Components of Our Turbidity Meter Phototransistors Vial Slot LED LCD Microcontroller Circuit Schematic 470 Ohms Transistor 1 LCD 100k Transistor 2 Voltage Ratio Vs NTU Rating 100k Voltage Ratio & NTU Correlation Voltage Ratio = Voltage at Transistor 1 Voltage at Transistor2 Using the polynomial equation in the graph, we can obtain the corresponding NTU rating Higher the Voltage ratio, lower the NTU MS Excel plot of Voltage Ratio Vs. NTU Rating Significant error +/- 5 NTU How it works: Vial Inserted LED Emits Light Through Sample or Gets Refracted Phototransistors Pick Up Photons Output Voltage Ratio and NTU Rating to LCD Screen Calculate Voltage Ratio and Respective NTU Rating Signal Converted to Voltage Possible Improvements Building a more compact container Fixing/mounting LED and Transistors firmly to prevent shock damage Error correction to provide a more accurate reading of voltage ratio Using a custom made circuit to cut down costs further Increase accuracy by using more test samples Demo Questions?
