<![CDATA[For some people, refilled gallon drinking water is an interesting option to choose than branded one because the price could be cheaper. Nevertheless, the owner of refilling service should keep maintaining quality of the drinking water to meet its quality requirements. In order to monitor the quality of drinking water at his or her refilling service, the prototype of wireless quality monitoring system is built using inputs from sensors, such as water temperature sensors, pH sensors, and electrical conductivity sensors. This device is also equipped with a water level sensor to detect the height level of water in the reservoir. A microcontroller used is Arduino Uno while NodeMCU ESP8266 is used in the monitoring system so the measurement results will be easily accessed and monitored. The tests showed |%Error| of the average temperature sensor was 0.487%, the pH sensor read average value of 4.00 ± 0.02 for pH 4.00 while for pH 7.00 the average reading value was 6.99 ± 0.01. The reading results of electrical conductivity sensor was 1.42 ±0.02 for 1.413 mS/cm solution and 12.89 ± 0.04 for 12.88 mS/cm solution. All these results could be monitored via LCD display at site or Thingspeak webserver through internet connection hence it can be concluded that the prototype works well.]]>
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