The ALS Ice Bucket Challenge has taken the internet by storm as tv stars, musicians, athletes, kids, students and everyone in between have thrown freezing water all over themselves in an effort to raise awareness (and millions of dollars) to help cure the neurodegenerative disease. So when [Christopher] was challenged by a friend, he decided to make an icebucket backpack that would pour the liquid from above without having to use his hands.
The wearable device uses a Barometric pressure sensor that is triggered when air is blown into a tube. This sensor is attached to an Arduino Uno. Once activated, the pouring process begins drenching the person below in ice cold water. It’s a little unnecessary, but it gets the job done in a fun, maker-style way. Now if you make something similar, don’t forget to actually support the cause and donate money.
To see the icebucket backpack in action, check out the video after the break:
Continue reading “The Handsfree Icebucket Challenge Backpack”
Lift. For a sailplane pilot it means the difference between a nice relaxing flight, or searching for an open area to land. Finding lift isn’t always easy though. This is especially true when the sailplane is hundreds of meters above a pilot whose feet are planted firmly on the ground. That’s why [Tharkun] created PropVario. PropVario is a combination variometer and altimeter for Radio Controlled sailplanes. We’ve seen a few variometers in the past, most often for full-scale sailplane or hang glider pilots. Almost every full-scale plane has a variometer as part of its suite of gauges – usually called a rate of climb or vertical speed indicator.
R/C pilots don’t have the luxury of looking at a gauge while flying though. At altitude even large 2 meter gliders can appear to the naked eye as no more than a dot. It would be somewhat embarrassing to lose sight of your glider because you were checking gauges. The solution is actually simple. A varying audio tone indicates the rate of climb of the plane. Higher pitched tones mean the plane is going up. Lower pitched tones mean the plane is descending. This system, coupled with a simple radio transmitter, has been in use by R/C sailplane pilots for years.
Continue reading “PropVario, a Talking Variometer/Altimeter for RC Sailplanes”