Alcohol level tester bargraph

Last Updated on March 16, 2024

In this circuit LM3914 bar graph decoder IC used for to drive output, the alcohol sensor MQ3 used for to sense the alcohol intensity and the output signal fed into LM3914 bar graph decoder input pin.

Here the output is indicated through different colour LED, this circuit works on +5V power supply, the sensitivity level can be varied by VR1 variable resistor.


Components List

S.No Name Quantity
1. IC LM3914 1
2. Alcohol Sensor MQ3 1
3. Resistor 500Ω
Resistor 2.7kΩ
Resistor 3.9kΩ
Variable resistor 20KΩ
4. LED different colour 10
5. Connecting Wires As required

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