Comparison of Automatic Water Taps Using Ultrasonic Sensors and PIR Sensors

Abstract

Water is vital for all living things on the earth, so there must be an effort to save water. One effort to save on water use is by making automatic water taps. Automatic water taps which are meant here are water taps on the sink and also water taps for ablution. The working principle of the two taps is the same, that is, the water tap will open if there is an object (human) detected in front of the water tap. In this automatic faucet system the arduino mega 2560 microcontroller is used as data processor obtained from ultrasonic sensors and Passive Infrared Receiver (PIR) sensors. The two sensors are used interchangeably and the results are compared to determine the difference in response time. Based on the tests that have been done, it is found that the time needed for the ultrasonic sensor to open or close the water tap is faster than the PIR sensor. When opening the tap the time needed by the two sensors is almost the same, which is only 4ms difference. Whereas when closing the tap the time needed for the PIR sensor is much longer, which is more than 4s. This is because the process of returning the sensor to return to normal is not detecting the presence of humans or in other words the sensor does not detect infrared rays tend to require a longer time. As for the ultrasonic sensor because what is detected is the distance, so the object moves from the front of the tap then the distance detected will change immediately so that the tap will immediately close again.