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Hi, this project is designed for Arduino MEGA which has more than one serial port.Arduino UNO has only one serial port.
GearBest laser engraver DIY Kit assembly instructions
Hi, the conductivity meter is made by two wires (yellow and green) on the solution. These two wires, with the 33k resistor, are part of a voltage divider (https://en.wikipedia.org/wiki/Voltage_divider). The analog input A0 measures the voltage across the 33k resistor. The measured voltage across the resistor is proportional to the conductivity of the solution.
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