VCC is the Gas Detection Sensor's power supply pin, which can be linked to a 5V source. ... Arduino Uno MQ-3 Alcohol Sensor – Connection Diagram. Now that we know how the MQ-3 alcohol sensor works, we ...

Fig. 1 shows a circuit of the alcohol level tester. Alcohol sensor MQ3 is used here to detect the alcohol fumes’ concentration. Fig. 1: The alcohol level tester circuit diagram Pins 2 and 5 of MQ3 are ...

Fig. 1 shows circuit diagram of the smoke ... for detection of alcohol, MQ3 sensor is used, while MQ6 sensor is used for detecting LPG cooking gas. - Advertisement - MQ* sensor has six pins. Heater ..

An 8051 Microcontroller-Based Alcohol Detection System using an MQ3 sensor and buzzer was developed to enhance safety in industrial areas and prevent accidents due to alcohol consumption. This project ...

MQ6 Gas Sensor. The below image shows the MQ6 sensor pin diagram. However, the left image is a module-based MQ6 sensor for interfacing with the microcontroller unit, the pin diagram of the module is ...