SMS water leak alarm with microcontroller

Abstract

In any appliance that uses water, such as a dishwasher or washing machine, it is possible to cause water damage if the leak is not noticed in time. The leak can be difficult to locate. The purpose of this thesis was to make a system that sends a traditional text message SMS when a sensor detects a leak in a household appliance. The implementation was made with a microcontroller and water sensor which contains HW and SW design. The article uses a microcontroller STC89C52RC and a GSM modem SIM900A to build a system for the water leak alarm. The system consists of a leakage detection circuit, a microcontroller minimal system and a SIM900A SMS modem. The water leakage detection circuit uses a water droplet detection module consisting of a water droplet sensor and a signal conditioning circuit. If there is a small amount of leaking water, the water droplet sensor can detect it and send it to the microcontroller control system after processing by the signal conditioning circuit, and the microcontroller sends command to the SIM900A SMS modem to start the module sending alarm alert SMS to the specific receiver. The designed system of the thesis works and realizes the function successfully.