DIY Alcohol tester with MQ3 sensor and NE555

The alcohol tester with the MQ3 sensor uses this sensor to detect alcohol in the breath, specifically ethanol. The NE555 chip functions as a timer that activates an alarm or LED signal when the sensor detects alcohol levels above the permissible threshold. This device is useful for personal use in alcohol testing or for automatic systems to check drivers.
Parts list:
1 x 5,1Ω resistor
1 x 120Ω resistor
2 x 1kΩ resistors
2 x Led diode
1 x 1N4148 diode
1 x 10kΩ trimmer
1 x piezo
1 x NE555 chip
1 x MQ-3
1 x Relay
1 x Switch
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