The output of the system was tabulated against reference voltage and it was found there was some attenuation but linearity was preserved. It was found that the voltage of the 5V regulated power supply was dropping due to the current drawn by the LCD. This error would be corrected by the auto calibration function. The positive terminal of the power supply is at the same potential as of the arduino ground. Hence the output of the system had to be attenuated and inverted for the analog read pin. An inverting amplifier was used. But it was drawing current and so the voltage divider network was not giving correct output.
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