We use Atmel AVR ATmega8535 microcontroller and LM35 temperature sensor as the main components of the system. Liquid Crystal Display (LCD) and buzzer are used to display the server room temperature and as an alarm, respectively. In order to alert the

GSM功能说明，远程短信控制继电器的开和关，带有定时功能-Function GSM remote control relay messages on and off, with timing function