Using an Arduino NANO or just about any Arduino you can create a very accurate PH & EC/TDS meter for hydroponic and gardening. Connect your Arduino to your computer, start the Arduino IDE and flash ...

1 conductive paint/solder "910-CP1-5S CP1-5S Conductive Paint LR" 1 2462 OpAmp 2 10 uF electrolytic capacitors 2 100 nF capacitors 1 10 ohm resistor 2 4.7k ohm resistors 3 10k ohm resistors 1 MKR wifi ...

Abstract: We connected $\mathbf{p H}$ sensor and solar cell into Arduino Board to control data transmission via red laser communication or popular known as visible light communication (VLC). The ...