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Arduino Uno water turbidity gauge has been successfully designed and manufactured. This tool is made using LDR as sensor and led as a light source to measure the water turbidity value and Arduino Uno for data processing. The existence of this tool is already familiar and comfortable to find. However, the price is relatively higher to make this tool is only owned by certain circles only. Nephelometric Method is a method of measuring the turbidity of water by passing a light source on water so that the intensity of light reflected by the substances causing turbidity can be known. With the use of led as a light source and photodiode as a light detector, and combined with processing using Arduino Uno then the voltage obtained from the LDR sensor in the form of analog data is processed into digital data and can be displayed in the LCD.

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Technological developments are so rapid at this time to make people want always to be creative and trigger to create something new which can be applied and can use quickly and practically and control from close range and distance. In this research how to design home security system using PIR sensor (Passive Infra Red) based on microcontroller. Where this safety will work if the PIR (Passive Infra Red) sensor detects any human being that does not want to enter into the house, and then the micro controller process and instructs cell phone 1 to send an alarm signal in the form of SMS (Short Message Service).