Alcohol detection and engine locking system using Arduino Uno and MQ3 sensor.

Hello friends, in this tutorial I will show you how to make alcohol detection and engine locking system using Arduino uno.


Components used in this tutorial:
•  Arduino Uno
• MQ3 alcohol sensor
• 5v relay
• BC547 transistor
• 220ohm ressistors
• 9v batteries and caps
• Led
• Buzzer
• Mini breadboard

Required tools:
• Glue gun
• Soldering iron
• Wodden board
 
link for code and circuit: https://drive.google.com/drive/folder...

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