DIY Turbidity Meter using Arduino & Analog Turbidity SensorNextPCB offers first 2-layer 100 X 100 mm PCB with 0$ : https://www.nextpcb.com/?code=Htoeletric4-layer PCB - 12$ : https://www.nextpcb.com/?code=Htoeletric...www.youtube.comTurbidity measurementTurbidity is the cloudiness of a liquid caused by suspended particles. These particles scatter the incident light and the liquid loses its transparency. The ...www.youtube.comOysters filtering water to clearOn the left is Crassostrea gigas (the rock oyster, the same type as the ones you might find in supermarkets) in the middle is just water and algae with no o...www.youtube.com Remote food feeder Check from a home monitor smartphone app You Should Consider An Automated Fish Feeder | Perfect for VacationClick here to SUBSCRIBE: http://bit.ly/1MhbNy8Can't remember to feed the fish every day? You are busy? Get yourself an automatic feeder, you don't need to wo...www.youtube.com