I'm working on an arduino project and ordered some LM34 temperature sensors and received these. These do not look like any LM34 temp sensors i've ever seen....what are these?



Fuck. nvm. Google told me they're alcohol sensors. FML. Anyone need 3 of these? Or have a LM34 sensor you'd trade for or sell?



[Edited on April 17, 2011 at 5:08 PM. Reason : .]

4/17/2011 5:05:44 PM

found this on google, searching for ""MQ-3US" part"

http://www.satistronics.com/alcohol-sensor-mq3_p2767.html


nevermind

[Edited on April 17, 2011 at 5:11 PM. Reason : ]

4/17/2011 5:11:00 PM

Yeah, thanks. I found that about 1 minute after I posted. I swear I googled MQ-3US before I posted this thread

4/17/2011 5:18:45 PM

Fucking awesome. You can make a breathalyzer.

4/17/2011 6:14:11 PM

Any reason you didn't choose a DS18S20?

[Edited on April 17, 2011 at 7:17 PM. Reason : .]

4/17/2011 7:17:17 PM

DS18S20 FTW

4/17/2011 7:57:38 PM

well, i'm definitely a n00b. Seeing as how i'm going to have to reorder a temp sensor, is the DS18S20 better?

4/17/2011 8:10:46 PM

everything has its application. what are you trying to do?

4/17/2011 8:13:20 PM

Well, ultimately I hope for it to be a temperature sensor for my kegerator. I want it to monitor the temperature and send me an email/text if the temperature gets too high.

Is there a good/cheap waterproof sensor I could use? I'd really like to be able to submerge a sensor in some liquid to get an accurate liquid temp, but I'll accept air temp for now.

4/17/2011 8:18:24 PM

It's better because you can read it digitally and not fool with the ADC. I think whether you use the LM34 or anything else you need to waterproof it. You could try something from here

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1211056457

and for interfacing to the DS18S20

http://www.arduino.cc/playground/Learning/OneWire

Or this

http://www.cheapvegetablegardener.com/2010/01/homemade-waterproof-digital-thermometer.html

[Edited on April 17, 2011 at 9:43 PM. Reason : .]

4/17/2011 9:40:58 PM

Good resources. Thanks

4/17/2011 9:59:47 PM

Do you mind sharing some more details on your design?

I want to do something very similar using my arduino. I want to monitor a temperature in our plant and sent out an email (or some type of communication) when the temperature leaves a certain range.

I'd appreciate any help.

4/30/2011 10:25:38 AM

Either the sparkfun, adafruit, or arduino forums are going to be better resources for this.

Several ways you could do this...either with a zigbee/xbee wifi setup so your micro could directly email (assuming you have wifi available in the plant) or through something a little bit more (older)fi using a basic 433Mhz transciever at both ends with an app running on your PC polling either an RS232 or USB connection and sending the email this way.

I suppose you could also run some long wires and use a CAN bus since your data rates don't need to be fast...but who likes wires?

[Edited on April 30, 2011 at 11:05 AM. Reason : .]

4/30/2011 11:05:12 AM

Thanks, I appreciate the feedback. I'm out of the office this week, but aim to do the first pass design next week.

5/2/2011 2:20:49 PM