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Topic: Breathalyzer with MQ-3 and Arduino (Read 1 time) previous topic - next topic

dansku

Mar 07, 2010, 03:48 pm Last Edit: Mar 07, 2010, 07:36 pm by dansku Reason: 1
Hi, I've made a Breathalyzer with MQ-3 and Arduino and wrote a full DIY tutorial

if you guys wanna take a look:



TUTORIAL HERE:

http://www.danielandrade.net/2010/03/07/building-an-breathalyzer-with-mq-3-and-arduino/

:D

Tornadoboy

Nice! It would be really cool if you could get it to give you accurate readings in numbered digits! We should work this circuit into the Openbar project!

fubbi

hi

I am thinking of building something similar. Did you feel that the range of the MQ3 was enough? I am looking at the TGS 2620 which is far more sensitive and three times more expensive. Or is that overkill for alcohol testing?

thanks

fubbi

2xyo

Hi guys,

I bought the MQ-3 sensor. It's easy to read the value of the sensor with an analog pin.

BUT i have a big problem : i need to calibrate the detector for 0,4mg/L (approximately 200ppm) of Alcohol concentration in air..

How get exactly 0,4 mg/L of Alcohol concentration in air ? :-/


fubbi

http://en.wikipedia.org/wiki/Blood_alcohol_content

various cryptic charts, should tell you how many beers to drink to get enlighted  ;)

fubbi

2xyo

Thanks for your link. I also checked http://en.wikipedia.org/wiki/Breathalyzer#Calibration but there is no DIY solution...

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