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 |
1 1 1 1 |
| 4. | LED different colour | 10 |
| 5. | Connecting Wires | As required |
For this project simulations