Gas detector circuit ATMEGA48 microcontroller based on the used gas sensor MQ-4 gas when it detects buzzer with audible warning in addition to the RGB LEDs with a warning status reported in the blinking green, green, flashing red, red.... Electronics Projects, ATmega48 gas leakage Detector (MQ-4 sensor) "avr project, microcontroller projects, " Date 2019/08/05