Homemade Breathalyzer - Measure Alcohol in the Air

High quality PCB prototypes: www.pcbway.com
🔥How to properly measure alcohol in the air using the MQ-3 sensor and the Arduino code to read the data and values from the datasheed graph. Display PPM values, BAC in % or other concentration values
🔀LINKS
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Tutorial page: electronoobs.com/eng_arduino_...
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00:00 Intro
02:10 How MQ-3 Sensor works?
05:13 Circuit and output
06:38 PPM read equations
10:12 Assmeble
12:07 Test
13:40 Thank You
Like share and subscribe to motivate me. Thank you
#electronics
#homemade
#circuits

[@ELECTRONOOBS]

Join my Arduino Course (Spanish): bit.ly/2JY8icE My Tools: bit.ly/3uv8bc3 Help me on Patreon: www.patreon.com/ELECTRONOOBS

[@troublehd7236]

And again a high quality video from Electronoobs. I don't know if I understood everything, but I keep an eye on this project. Mybe I will build it myself to understand it a bit better, and to bring a funny gaget to the next party :D

[@digus]

Awesome! This is one of my favorites. May actually build one myself.

[@mumbucorporation7243]

Muchos gracias you made me finally understand how to calculate and implement that calibration of the gas sensors ❤

[@pouketriumph4640]

Very helpful and educational, thank you

[@vedantsamadhiya2304]

Happy to see your new video 😊

[@NoahK216]

Really cool idea, might build one myself

[@duyucnguyen9138]

Can u please tell me how to the R0 = Rs/50 with interpolation from the graph?

[@ishimwehonore8042]

Happy new month brother, always thumb up

[@joelshopefullyhelpfulvideo3010]

Very cool Project! I vote that you should do a quick follow up video and test it after a few beers haha. Great content!

[@anonuser2640]

Very nice and educational

[@santoshbansode697]

Nice to see you again,,,,,,,, very helpful and informative videos thanks,,,,,,

[@user-ls3nk6cv3t]

what if my the resistor at the back of the MQ3 sensor is only 1 kilo ohms, will it still work

[@RIMAMNYANGRIMAMSIKWEURES-xq4oe]

Good video, I need more clarification on the plotting of ppm value against the voltage value of the sensor

[@ranganatennakoon]

thanks

[@Delali]

This is super useful. I personally like how you break down the graph and how to do the calculations. Nice work.

[@FuZhi_666]

Can that code be found on the internet?

[@technotroll-pro]

А мне нравится вечерком с баночкой пива попаять)

[@skyhigh6148]

What circuit designer did you use here at 10:45

[@Delali]

Just a quick question....so you've actually figured out how to read alcohol much accurately right?

[@maxidemmel7970]

Hello nice project can i have the full code ? :) is try this at home but i faild with the code to setup the buttons ond the heating timer THANKS !

[@BioExtract]

Why didn't you upload the completed code where you have the sensor capturing values and outputting the average/max? That's quite important for building this out.. You only have the part where it's outputting the sensor value at PPM or BAC.

[@christianvargas2315]

Yeah, went a ahead and added everything into a loop that only reads when held down. What’s left on the screen is the last value. Also modified to display both ppm and bac on the screen at same time. Will see if I can code in to display last highest value or something. Would like to see @electronoobs code tho.

[@jamess1787]

Drinking for science and coding hurray!

[@doublee4714]

👍

[@MikesTropicalTech]

Estrella Damm! I'm starting to drink that here, now that I've moved to Barcelona.

[@ELECTRONOOBS]

hahaha my favorite!

[@johnborrell9021]

Good beer, Estrella Damm. Have you tried Voll Damm?

[@anonuser2640]

👏👏👏👏👏

[@jesusreignonhigh6732]

Hi, just a thought, I'm looking to see how a USB can be implemented on any customer PCB projects. Do you think you can make a video on how to implement USB for serial comm?

[@ELECTRONOOBS]

I thnik Arduino has a USB host library for that...

[@harrickvharrick3957]

Why the tester (and especially the actual sensor in it) is not constructed in a way that allows air to actually flow through I do not understand. Besides that, 'real' breath testers also measure how much air has passed through! I am not sure whether or not a tester that does not take into account the volume of air blown into it can actually provide sufficiently accurate outcomes. It may or may not make any difference. When the tester does not register what amount of air passes through that indeed would allow for false measurements, such as ones being caused by a remains of liquid alcohol still present in the mouth or traces of it that may be present in the top layer of tissues in the mouth, or on them, as the guy kind of does too.

[@fouzaialaa7962]

its insane how you cant drive after only 1 sip in Spain !!

[@ELECTRONOOBS]

Yes you can. 0.05 is actually something like 1 or 2 beers.

[@GRBtutorials]

This test was done immediately after drinking, so the alcohol is still hanging around in the mount, giving an inflated value.

[@sammin5764]

🌟🌟🌷🌟🌟🌷🌟

[@PedroCoelho98]

0,05 mg/L is not 0,5 mg/L. 😁🍻

[@ELECTRONOOBS]

I think I show 1g/L and 1mg/mL

[@atlantaperimeter]

you should always drink beer from cans with a straw, you know, the rat $hit.

[@thefishguy1241]

omg

[@thefishguy1241]

No

[@sturkjerikin2473]

As a Muslim I always wonder whether some food contains alcohol or not (Because Alcohol is 100% forbidden in Islam) I want to build this project and test if it can detect alcohol on food or not

[@YouGenom]

many foods, fruits etc. contain alcohol, it is more or less everywhere.

[@sturkjerikin2473]

@@YouGenom what I know is fruits doesn't contain alcohol when they are fresh Could you give me examples in order I check For foods it's clear that it depends on the one that made this food he can add alcohol or not

[@TecSanento]

Could you please stop calling prototypes like this a finished product? because as a product developer for hardware products with PCBs I have to tell you, that this is miles away from a finished product :/ Although, it's a great project and I will definitely try to build it myself! :) seams like a fun little gimmick

[@ELECTRONOOBS]

;)