As convenient as cell phones are, sometimes these power-hungry devices let us down right at the worst time. We’re talking about battery life and how short it is in modern cell phones. Sure that’s totally inconvenient sometimes but it could be way worse. For example: during a natural disaster. A cyclone hit [Ganesh’s] home city and the entire area had lost power for 10 days. He couldn’t plug in his phone to charge it even if he wanted to. After realizing how dependent we are on the electrical grid, he did something about and built a phone charger out of parts he had kicking around.
The charger is quite simple. The user cranks on a DC motor and the output power goes into a LM2596-based step-down voltage regulator. The output of the regulator is then connected to a female USB connector so that any USB cord can be plugged in. As long as the motor is cranked fast enough to put out at least 8vdc, a steady stream of 5v will be available at the USB connector. Max current output of the system has been measured at 550mA.
[Ganesh] admits this isn’t a practical every-day charger but in a pinch it will certainly do the trick. It is even possible to build a makeshift charger out of a cordless drill.
Continue reading “DIY Phone Charger Born From Cyclone Disaster”
For centuries, human-powered flight eluded mankind. Many thought it was just an impossible dream. But several great inventions have been born from competition. Challenge man to do something extraordinary, offer him a handsome cash incentive, and he may surprise you.
In 1959, London’s Aeronautical Society established the Kremer Prize in search of human-powered flight. The rules of the Kremer Prize are simple: a human-powered plane must take off by itself and climb to an altitude of ten feet. The plane must make a complete, 180° left turn, travel to a marker one-half mile away, and execute a 180° right turn. Finally, it must clear the same ten-foot marker. While many tried to design crafts that realized this dream, man is, at his strongest, a weak engine capable of about half a horsepower on a good day.
Continue reading “Retrotechtacular: The Gossamer Condor”
Power outage? For the average citizen it’s very easy to take electricity for granted. Go a few hours or more without it though, and you’ll suddenly be reminded just what a luxury it is. During an emergency situation, sometimes you have to come up with alternative methods to get the job done. This human powered cell phone charger is a great example.
Using just a few ordinary around the house items, [The King of Random] turned a cordless electric drill into a human powered electrical generator. If the drill is run in reverse and cranked by hand, the generated energy can be transferred through the battery terminals to a connected device. So, he cut a USB charger cable in half and wired it up to the terminals to be able to charge his cell phone. Some yarn, a salad fork, a mixing beater, a scrap 2″x4″, some aluminum foil, and scotch tape were the only other materials he used. Using this technique, a totally dead phone battery was charged in around 3 hours.
Remember that this method is only intended to be used in an emergency, not as every day practice. Using these methods could potentially overheat or damage your gear, so be careful.
Check out the MacGyver worthy video tutorial after the break.
Continue reading “Human powered emergency cell phone charger”
Those of us living in the first world take clean clothes for granted. Throw them in the washing machine, transfer to the dryer after 45 minutes, and you won’t smell for another two weeks or so. But for people living in areas without electricity, clean clothes are a huge amount of work. Hand washing a family’s clothes is estimated at 6 hours per day, three to five days per week. Here’s a post that looks at some of the different human-powered washing machines out there.
We’ve built our own human-powered machine before using a five-gallon bucket with a hole in the lit to receive the handle of a toilet plunger which acts as an agitator. But that pales in comparison to some of the machines seen here. The concept we like the most is shown above. It’s an MIT project being used at an orphanage in Peru. The bicycle lets you easily power the spinning basket inside of the drum. The rear derailleur has been mounted on the axle so that the rider has a wider range of gears when spinning heavy loads. Take a look at the post linked above to see all of the offering, but we’ve also embedded video of two of them after the break.
If you were looking for a washing-machine powered bike instead of a bike-powered washing machine you’ll want to head on over to this post.
Continue reading “Washing machines that do it without electricity”
A team from the University of Maryland will be taking their human-powered helicopter to the air tomorrow. The current flight record for this type of vehicle is just over 19 seconds of flight at a height of about 8 feet. What surprises us about this attempt is that they’re not pedaling just one main rotor. It seems that the most success in man-powered helicopter flight has come from helicopters with a total of four rotors.
The image seen above is a 2009 test of just one of the four rotor arms that will go into UMD’s finished chopper. Fully assembled it will be about 1/3 the size of a football field, dwarfing the autonomous quadcopters we usually see around here. Get the details about the design from the video after the break. It’s interesting to hear [Dr. Antonio Filipone] talk about the need to generate both the lift and the thrust, where human-powered fixed-wing aircraft only need the thrust. He predicts that human-powered helicopter flight is possible, but that it will only lift the aircraft, with little possibility of moving it in one direction or the other.
The team is attempting to grab the $250,000 Sikorsky Prize with their creation. We wish them the best of luck.
Continue reading “Human-powered quadcopter flies live tomorrow”