Simple Arduino Breathalyzer
Introduction
The MQ series of gas sensors use a small heater inside with an electro-chemical sensor.
They can be calibrated more or less but a know concentration of the measured gas or gasses is needed for that.
They are sensitive for a range of gasses and are used indoors at room temperature.
The output is an analog signal and can be read with an analog input of the Arduino.
They can be calibrated more or less but a know concentration of the measured gas or gasses is needed for that.
They are sensitive for a range of gasses and are used indoors at room temperature.
The output is an analog signal and can be read with an analog input of the Arduino.
SainSmart MQ-3
The analog gas sensor - MQ3 is used in gas leakage detecting equipments in consumer and industry markets, this sensor is suitable for detecting LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke.
It has a high sensitivity and fast response time.And the sensitivity can be adjusted by the potentiometer.
The MQ-3 is an alcohol gas sensor that is available for about $5.
Connetting
Sensor-Arduino
GND - GND
A0 - A0
VCC - 5V
Arduino Schetch
Test Code:
int val=0;
void setup(){
Serial.begin(9600);
}
void loop(){
val=analogRead(A0);
Serial.println(val);
delay(100);
}
Link App
https://drive.google.com/file/d/1naIS3WD_Boty_EjX_9em6Vw1NMy59dps/view?usp=sharing
