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Giovanni designed an Alcohol breathalyser [machine translation] using only an 8 pin PIC12F683 microcontroller, the MQ-3 alcohol gas sensor, and a 30 bar-graph breakout.
PIC12F683 alcohol breathalyser based on MQ-3 sensor - [Link]
This is a simple breath analyzer based on a gas sensor (MQ-3 from Sparkfun) that is highly sensitive to alcohol. The author demonstrates how to interface the gas sensor to Arduino to sense the content of alcohol in your breath. [via]
Arduino based breath analyzer – [Link]
This project is an Arduino based alcohol breath tester using MQ3 alcohol sensor and some LEDs and resistors. [via]
Arduino alcohol breath tester - [Link]
This is a smoke/gas detection circuit. The sensor is the GH-312 sensor and it is used to detect : smoke、liquefied gas、butane and propane、Methane、alcohol、hydrogen、etc. Also has a 16F84A microcontroller and a 8X2 LCD. The circuit is powered by a 9V battery but, since it’s used a 7805 regulator, a 12V battery can also be used. Attached is a picture of the circuit initializing. The LCD displays the circuit name “Gas Detector” and it’s version. After initialization the circuit will enter a normal state where it detects no gas. The display shows “Sensing No Gas”.
PIC16F84A Gas Detector using GH-312 sensor - [Link]
