alcohol detector circuit diagram

The presented circuit diagram serves as an alcohol detector.  This project is used to measure the level of alcohol in the breath.  


Driving under the influence of alcohol causes accidents every day.  Very useful project to check whether driver is drunk or not.  This project is very cheap and easy to use.  


In this project, we have used the MQ3 sensor to detect the level of alcohol in the breath.  An IC LM3914 is used to convert the alcohol sensor output to digital. 


And pins 1, 18, 17, 16, 15, 14, 13, 12, 11 and 10 of ic LM3914 are output pins.  These pins are connected to 10 different LEDs of different colors.  Pin 5 of the ic is connected to the output pin of the alcohol sensor.  And the pin 3 and 9 of the ic is connected to +v.  And pins 2 and 4 of ic are grounded.

Circuit diagram 

<img src="image_alcohol detector circuitdiagram.jpg" alt="a diagram of alcohol detector circuit">
How to work alcohol detector 

As soon as an alcoholic exhales in front of the MQ3 sensor, +V starts getting at the output pin 5 of the sensor.  And the output pin 5 of the sensor is connected to the signal pin 5 of the ic LM3914.  Due to which +V comes on pin 5 of ic LM3914.  And 10 different colored LEDs connected to the output pin of the ic LM3914 indicate the alcohol level.  


Note: Consumption of alcohol is injurious to health.  The objective of this project is to demonstrate the working of an alcohol sensor.

List of electrical components used in this circuit 

alcohol sensor 

MQ3

ic

 LM3914 

Resistance 

R1 470E

R2 3k ohm

R3 3.9I ohm

V/R1 20k ohm

LED 10p

Watch full video 

Location: Ramala, Uttar Pradesh 250623, India

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