Abstrak This final report discusses the levels of carbon monoxide detectors (CO). By utilizing components as a means of controlling ATMega8 microcontroller, a sensor TGS2442 sensor module (CO), TWS-DS-3 which serves as a transmitter, RWS-434N which serves as a receiver and LCD as a producer of data input digital. Bagian transmitter duty to read the output of the sensor TGS2442 and transmit vi…