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The number of residential fires in urban areas is increasing every year. The use of automatic fire detection technology can prevent greater fire disaster losses. The fire detection system works by detecting increasing degrees of heat, ultraviolet radiation by flames, and gas leaks. The system will start automation if the LM35 Temperature sensor, MQ2 Gas sensor, and Light Dependent Resistor (LDR) detect the occurrence of fire according to the initial settings on Arduino Uno. After Arduino Uno processes input data from the sensor, there will be a notification notification marked with the Buzzer and a text will appear on the Liquid Crystal Display (LCD) that describes the condition of the sensor reading. Arduino Uno configures data via the GSM SIM900A Module. The last process is sending short messages (SMS) from the GSM SIM900A Module to the receiver to notify the initial warning of a fire. the delay time in testing the farthest distance (100 cm) is as follows: LM35 140 second Temperature Sensor, 130 second MQ2 Gas Sensor and LDR 145 seconds