Hi, guy today we are going to make a breath analyzer which detects alcohol vapour. so, first
you need to show how does the sensor work so, the sensor work with a chemical reaction with what
it will tell you the readings. so, lets begin :):):):):):):):)
Step 1: Gather Your Organs
2.OLED or Lcd
4.MQ3 gas sensor
You can use MQ6 too.
Step 2: Connection to Arduino
1.The OLED VCC wire will go to 3.3v of the arduino. GND will go to GND. SCL to A5. SDA to A4.
2.the gas sensor VCC to 5v. gnd to gnd. AD to A0.
Step 4: Test It
When u upload the code if it say warning up so then wait 15 mins if it give the reading it
is working well. if check the code or your connections
Step 5: Finished