An alcohol-detection system and an all-in-one safety-start system were designed to prevent drunk drivers evading from detections and to ensure driving safety. The system should test drivers' alcohol before starting the car by voice. The system's control-core was an open-source electronic-prototype platform Arduino. The system has a basic safety-driving-detection function by combining an alcohol-sensor module with a voice-sensor module. The system modules were installed in two places and the two separated mo...