Automatic faucet with changeable flow based on MQTT protocol

In every day, “handwashing” is one of most frequent activities for everyone across our world. In every washing process, we lose some water. The losing is started from the turning on until the turning off the faucet. The attempt to save the water is to use of the automatic faucet. However, most of automatic faucets are fixed the faucet's turning off delay, but people may have the difference hand washing behaviors. So, the delay may be too slow for some people but it may be too fast for some others. In this paper, we proposed the automatic faucet which can adjust its turning off delay via the web application based on MQTT protocol. The objective of this faucet is to maximize the saving of water while it can still meet the contentment of users. The proposed faucets are tested by 100 users at the student's restroom in the department of computer science, Maejo university. The result shows that the turning off delay time of 0.3 seconds is the most optimal delay to save the water while still maintaining the high score of user contentment.