The actual study, which you have buried in that list of links, is actually quite nice. http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.00829

The actual study, which you have buried in that list of links, is actually quite nice. http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0082935 http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjourna... They achieved about .3 bits per second. Components needed to replicate: * DuroBlast Electronic Spray * Arduino: https://www.sparkfun.com/products/11021 https://www.sparkfun.com/products/11021 Alcohol Sensors: * MQ-303a : http://www.seeedstudio.com/depot/alcohol-sensor-mq303a-p-549.html http://www.seeedstudio.com/depot/alcohol-sensor-mq303a-p-549... * MQ-3 : https://www.sparkfun.com/products/8880 https://www.sparkfun.com/products/8880 * MR513 : http://www.cooking-hacks.com/mr513-alcohol-high-accuracy http://www.cooking-hacks.com/mr513-alcohol-high-accuracy So their setup is probably about $100