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DIY Air Quality Balloons
An anonymous reader writes "A few students at Carnegie Mellon University outfitted weather balloons with air quality sensors, resulting in huge glowing balloons that respond to surrounding air quality. Their Instructables page shows that pretty much anyone can make these using a PIC, a tri-colored LED, and some off-the-shelf air quality sensors (about $10 each): 'This Instructable will show you how to make giant, super cool, glowing balloons that react to surrounding air quality. Inside each balloon is a tri-colored LED. This LED reacts to data from an air quality sensor, turning green, yellow or red based on low, average, and high values.'"
Pollen? Cyanide content? Instant death fumes? CO? Weak article.
Why the balloons in the article are all glowing different colors?
Does having a witty signature really indicate normality?
How long until Boston locks down because of a terrorist attack.
1-31-07 Never Forget.
It depends, on whether some idiot decides to paint on the sides of the balloons characters no one over 30 has ever seen with their middle fingers extended.
"Nine times out of ten, starting a fire is not the best way to solve the problem." - my wife