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The breathalyzer microphone is a system for the inconscpicuous collection of blood-alcohol content level data sets. In other words, you can measure a ...
You will need:- A MQ-3 Alcohol Sensor (available via Futurlec. Allow a few weeks for shipping from Thailand. Be warned! Ordering anything else from Fu...
Simply twist the windscreen counter clockwise and it should unscrew right off.
Loosen the mic from the casing by twisting them apart gently. That means that you need to simultaneously pull and twist to separate the two. The mic i...
To remove the switch from the casing, the on off label has to be carefully peeled up. Be careful not to bend or destroy it, since you will be putting ...
Locate the screw at the bottom of the casing. This is holding the XLR plug in place. Unscrew this screw as well to free the XLR plug. Once you are don...
All of the microphone's components should now be free from the casing. Gently pull on the microphone element to remove all the wiring from the casing....
The XLR plug in most cases is probably setup for mono audio output. This usually means that two of the pins are grounded (notice in the secondary imag...
Preparing the switch is easy. Only the red wire coming from the XLR plug should remain connected to the switch. Cut away all extra wires with your wir...
Attach a wire that is about 8" long to the one pin on the XLR plug that is no longer connected to anything.Also, take your wire cutters and remove the...
Attach a red wire that is about 6" long to the tab on the switch that used to be connected to the microphone, but to which no wires are currently conn...
Reinsert the wiring into the microphone casing starting with the XLR plug. The XLR plug probably needs to be orientated in the right direction to be a...
There should now have 3 wires sticking out of the top of your microphone casing. If it hasn't been done already, strip about an inch of plastic off th...
Cut two red wires and one black wire of about 6" length. The black wire should be connected ____. The red wires should go to the other two ______.
Before all of the components are soldered in place on the microphone, it would be ideal to determine which wire is going where when the XLR cable is c...
Attached is a file for a mounting bracket which will fit snugly inside the opening in top of the microphone (at least my microphone). You may need to ...
Pick one side of the bracket to be the top and insert resistors through the outter holes so that one sits nicely on each side (forming a V-shape).Twis...
On the side of the bracket upon which you inserted the resistors, insert the alcohol sensor.Flip over the bracket. There are two groupings of three pi...
Position the bracket neatly in place. If this looks good, take it back out of place, put some glue on the sides/underside and put it back once more. T...
Once the glue is dry, put the windscreen back on by twisting it on clockwise.
To make your mic truly portable, you will need to make a discreet datalogger as seen in this Instructable.
Below is the code needed to test the Arduino. First, open the Arduino development environment. Next, load up the file found below. Lastly hit the "u...
I found the easiest way to simply make sure that its working is to turn on the serial monitor, wet a napkin with isopropyl alcohol, place the napkin n...
To take a reading, approach your subject and turn the microphone on at least one minute before having them speak into it. About thirty seconds into th...
To see the readings, just open your SD card on a computer and view the text files. The readings are the spikes in numbers in your text file
If you have a mac, you can plug your Arduino and microphone in the USB port and run the program found below for a fun time.
funtime.zip2 MB
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Posted:
Aug 6, 2008
License:
Public Domain
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