Hackett shows you how to build a bike charger for a deep cycle battery so you can power your life during the next natural disaster.

Mike Davis’ 555 chip charging circuit

Bull-riding is considered a super tough-guy activity, a chance for cowboys, rodeo queens, and wannabees to prove that they have what it takes to triumph in this quintessentially American pastime.

In our minds, all mechanical bulls fall short of being truly American in that they lack competition, the opportunity to directly humiliate another person. To elevate yourself at the expense of another– that is the real American way, and this ride will provide what the usual (suspiciously non-competitive in an almost Canadian kind of way) bulls fail to deliver.

These two bulls require two riders (one rider on each bull, just to be clear) to function, facing each other, Mano-a-Mano, Taurus-a-Taurus. They start off slow, and the difficulty mounts, bucking and spinning faster and faster, the motion of one mirrored in the other.

The bulls are built as near to identical as we could manage: same motors, same gearing, same motion, and are both controlled by one set of controls– what happens to one bull happens to the other, maintaining the same level of difficulty. The ride lasts until one rider flies off, leaving the other rider victorious.

In case there is any doubt in the mind of the riders or audience as to who has won (and who has lost), there is a big sign above it all, saying “LOSER”. A blinking arrow flashes towards the loser so everyone knows who is the lesser man.

The bulls spin on steel wheels.

The riders become the bulls by donning foam bull heads.

The riders are stuck with foam spears thrown by the Madadors and members of the crowd.

The motion of both bulls is controlled by a single joystick. Arcade buttons control the two LED arrows on the sign.

Would you like to taste pure awesome? Please contact us about running the bulls at your event.

An Adafruit MENTA board animates the LED pixels on the sign when a button is pressed. The code is open source and you can download it from Github.

In June Madagascar Institute presented the new Dueling Mechanical Bulls ride at the Google I|O After Hours party.

It’s our third year at Google I|O.

Tracy and Mary Beth flew to California with the in-progress bull heads.

They met up with Danielle who was up to some crafty fun making costumes.

The rest of us packed up the bulls in Brooklyn and headed west ourselves.

New artstar Colin received his first (of many) artscar. The grinder leaped out of his hands and went for blood, gouging a charred path in the flesh of his thigh.

Disdainful of the dangerous nature of the work required, Mark Krawczuk made some snazzy patches to commemorate the experience.

Then Colin got on it to see how it’d fare– just fine!

How about 200 lbs with both motors spinning? No problem.

The sign for the dueling bulls uses LEDs from Adafruit and is controlled by two arcade buttons.

More progress photos in this Flickr set.

Looking to add a little thrill to your chrome future?

My next project is an amusement device, based on those from the
past also wishing to push the envelope (be sure to snoop around the referenced by links for some great stuff):
http://www.google.com/patents?vid=USPAT846925,
http://www.google.com/patents/about?id=TChzAAAAEBAJ&dq=3141669,
http://www.google.com/patents/about?id=Dcc0AAAAEBAJ, with a fiery
twist.

It will be a gyroscope ride – 3 gimbals, with a rider inside –
however, each gimbal will have a propane cannon attached, top and
bottom, facing opposite directions. The rider, mounted inside the
inner most gimbal, will have throttle controls in each hand, bars with
big red buttons, giving control over direction and thrust, to propel
the gimbal rings and him or herself for a hell of a ride. The desired
effect is not only to allow the rider to experience a gyroscopic
effect, but also to send the fiery cannons spinning overhead, in the
periphery, and in front and behind. The ride will be hot.