Breathalyzer using Alcohol Gas Sensor with Arduino

makehub

# Title 
Breathalyzer using Alcohol Gas Sensor with Arduino
# Picture 
media: http://www.deviantsart.com/39rl9d8.jpg
# Objective

# Duration
1 hour
# Age Group
all
# Materials
## Arduino
* description:Edit me!
* quantity:1
* price:30€
* link:

## Breadboard
* description:undefined
* quantity:1
* price:3
* link:undefined

## Led
* description:undefined
* quantity:3
* price:2
* link:undefined

## Resistor
* description:undefined
* quantity:3
* price:1
* link:undefined

## Alcohol sensor
* description:MQ3
* quantity:1
* price:5
* link:undefined

# Steps
## Let's get started with our first LED
media: http://www.deviantsart.com/1tsrb9r.jpg

notes: We will connect a first LED to our Arduino Board to pin 13 and use a 10K resistor between the pin and the long leg of the LED.

## Is our LED working? Sending first code to test that.
media: undefined

notes: Use this code to test it https://gist.github.com/VimKanzo/9677451

## 1 LED down 3 to GO !!!
media: http://www.deviantsart.com/24nmv3r.jpg

notes: We will connect now 2 more LEDs to pins number 1 and 2. Don't forget the resistors;)

## Let's test our new LEDs
media: http://www.deviantsart.com/2jv7ptm.jpg

notes: Check your connection to the correct pins

## Now let's discover our Alcohol sensor
media: http://www.deviantsart.com/p0j03s.jpg

notes: We are using the MQ3 sensor. You can discover everything about here http://www.pololu.com/file/0J310/MQ3.pdf

## Our sensor has 6 legs, how do we connect them?
media: http://www.deviantsart.com/2pq94e5.jpg

notes: By placing the sensor with the sticker on the left side connect the middle pin left to ground (you can use the ground on the board or on the breadboard). Now let's look at the pins on the right side: middle one connects to power (5V), upper pin to ground and lower pin to A0. VERY IMPORTANT: don't forget to connect a 10k resistor between ground pin and ground connection to board.

## We're almost done, double check all your connections
media: http://www.deviantsart.com/3t7r4k5.jpg

notes: undefined

## And now let's code:)
media: undefined

notes: See the code here https://gist.github.com/VimKanzo/9677412

## And much awaited final test
media: http://www.deviantsart.com/mv2vi2.jpg

notes: Try to get some alcohol, the stronger the better and place the sensor inside the bottle. Your LEDs should light up based on the different intensity of the alcohol.

## Find out how it works
media: http://www.deviantsart.com/g3igj5.png

notes: Read more about breathalyzers  http://en.wikipedia.org/wiki/Breathalyzer

# Notes
If your sensor get's hot, don't worry, it will not explode. It is normal for the sensor to "burn" in order to be able to measure the ethanol.

makehub.json

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