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  • This Water clarity detector and automatic water refilling based sms gateway is a tool which is used by humans to make it easier to dispose of and fill water through SMS commands. this tool uses the color sensor, servo motors, and sim900. This tool aims to determine the disposal of turbid water and refilling its water by using a sample of PDAM water, Musi River water and water mix with food coloring. this tool uses the color sensor to detect water clarity, sim900 as a transmitter to notify the the level of water clarity information and servo motors to open and close the tap water in the process of disposal of water based on the command from arduino. To make the arrangement of wok program, this tool uses IDE Software program, at module arduino uno 328. Keywords : Color Sensor / Light Sensor, Sim900, Servo Motor.