Review Paper on Monitoring Water Quality to Improve Public Health using Sensors

Access to safe drinking water is vital as a health and development issue at national, regional and local level. In this paper we present a design and development of a low cost system for monitoring the water quality with IoT (internet of things).The system consists of some sensors used as measuring physical and chemical parameter of the water. In most part of the world, ground water is the only and vital supply for invention of drinking water, particularly in areas where water supply is limited. A sensor is the tool that detects and responds to the external stimulus from the physical atmosphere. The external stimulus contains: motion, light, heat, moisture, pressure or any sudden changes in the atmosphere. The output of the sensors is usually a signal which can be converted into human understandable form. All the sensors are very sensitive to small changes. So, most of the sensors size is very small. In general sensors are classified based on the power or energy supply requirement of the sensors and those are: Active and Passive sensors. Active sensors are sensors that must power supply to be active. On the other side, Passive sensors do not want power supply to work. Bases on the output they formed, sensors may be classified as Analog Sensors and Digital Sensors. Analog Sensors are producing a continuous output signal which is generally relative to the quantity being measured. Digital Sensors produce a digital representation of the quantity being measured.