Training On the Use of the Mq-3 Sensor Tool For Monitoring Alcohol Levels in Humans at Senior High School Nurul Jadid

Abstract

Alcohol is a psychoactive substance that is addictive. Psychoactive substances are a class of substances that work selectively, especially on the brain, which can cause changes in a person's behavior, cognitive emotions, perceptions, and consciousness. While addiction or addiction is an addiction or dependence on certain types of substances. To improve the standardization of human resources, of course, it must be free from all psychoactive substances, especially alcohol in this case. The Mq-3 gas sensor is a sensor that is suitable for detecting alcohol levels directly, both from gases in the air that come from inanimate objects or from someone's breath. The Mq-3 sensor element consists of an SnO2 layer with low conductivity in clean air. The sensor resistance will change along with the detection of the presence of ethanol gas by the sensor element. If the ethanol concentration is high, the sensor resistance will decrease so that the output voltage will increase. The results of alcohol level detection by the Mq-3 sensor will be processed by a microcontroller which is then displayed through a 16x2 LCD. And displays a notification according to the range (level) of alcohol detected via LED with three different colors and a Buzzer.