Overvoltage and Undervoltage Protection of Load using GSM modem SMS Alert

In the paper, GSM Modem SMS Alert aims to build a system that monitors voltage and provides a breakpoint based low and high voltage tripping mechanism that avoids any damage to the load and sends a text message (SMS) to alert the user whenever the condition of under-voltage or overvoltage occurs. There is a chance of damaging electronic devices due to the fluctuations the AC mains supply. Therefore, a tripping system is required to avoid any damage to these loads. This system consists of a tripping mechanism that monitors the input voltage and trips according to limits provides. It uses 8-bit microcontroller ATmega328 with a GSM modem and 16*2 LCD attached to it externally. As soon as the input voltage falls out of the window range, it delivers an error on screen. Here, a dc motor is used as a load. This system is also configured with a buzzer that goes on as soon as tripping takes place. The states of the system are displayed on the LCD. Whenever fault occurs the microcontroller sends message to the GSM modem, then the GSM modem sends alert SMS to the user to protect their device as soon as possible [1].