Connect one end of the photocell to 5V, the other end to Analog 0. Then connect one end of a 10K resistor from Analog 0 to ground Connect LED from pin 11 through a ...

This repository contains the code and schematics for a water quality detection system based on an Arduino Nano. The project uses temperature, pH, and TDS sensors to measure and monitor the quality of ...

Abstract: TDS automatic data collection was designed based on a sensor and Arduino board using red laser beam communication. The sensor was calibrated by measuring 4 different water solutions using a ...