Low cost hand-made potentiostat using Raspberry-Pi

Muniandy, Dharmindran (2021) Low cost hand-made potentiostat using Raspberry-Pi. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

While the world works to enhance water cleanliness, some sections of the world continue to suffer severe water purity problems. Lead traces exceeding the legal limit have been found in many drinking water systems. Excessive lead in drinking water are causing cardiovascular problems, blood pressure and hypertension increment, low kidney functionality and reproductive issues (in both men and women). Corrosion or solder joints in pipes are the most common problems of lead pollution, which can result in deaths in victims. In order to develop a cost-effective and precise solution, a unique approach had been determined for detecting lead in water sources with a low-cost portable device with high accuracy. A three electrode potentiostat is wired to a Trans-Impedance Amplifier, Low Pass Filter (LPF), and the signal is then read through a 12-bit ADC. The circuit was put into the test with two different value of resistance representing a dummy cell. To examine peaks at the voltage potential of resistor, the dummy cell is scanned with a cyclic voltammetry where three common wire used as the three electrode cell (working electrode, counter electrode and reference electrode) while the voltage and the current is monitored. The difference of resistance representing concentration of heavy metal in the dummy is determined by the maximum value of voltage potential measured.

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