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  • Carbon monoxide gas (CO) known as air pollutants harmful to human health. Dangerous because of this gas is colorless , have no race , and odorless so that his presence cannot be known without a means of detection and in certain levels can cause death. Based on the gas characteristics designed a device that can detect the magnitude of the concentration of carbon monoxide and can provide visual alerts in the form of LEDS if the levels of smoke descended ppm. To detect the presence of the concentration of carbon monoxide gas used of sensor CO MQ-7. The working principle sensors if carbon monoxide gas on the surface of a sensor made from sno2 and a unit of resistance will drop in accordance with the concentration of gas so great an output voltage will rise. Next big an output voltage will be converted into a unit of ppm (part per million). Mikrokontroller ATMEGA6 here used as controller and processor signals have been filled program from the Bascom AVR in order to run the hardware in accordance with the program has been included. To display the information levels of ppm is used blueterm applications on the Hp android that have connected with the Bluetooth module HC-06. Keyword: carbon monoxide gas (CO) , MQ-7 gas sensor , mikrokontroller ATMEGA16 , Bascom AVR, android