Thanks to Samer Muhi for sending in a video of his latest Quadrotors Wireless Power Transfer project. He is able to power his quadcopter with up to 20watts of energy using resonant inductive coupling. You can see the main coil sitting on the table which is operating at a resonant frequency is 800kHz. On the quadcopter arms you will see the second coil and some circuitry in the board
This Arduino Quadcopter by Kyle Fieldus has iPhone Control, similar to the AR Drone you can tilt the phone to control the quadcopter. Touch OSC is being used to design the phone interface, there is also an Android version available. The system chain is a bit complex since the phone is sending the input data to the computer, the computer determines what should be done on the quadcopter and
When developing a project there will come a time that you will need to communicate with the outside world. Serial communication is often the simplest way to get data in and out but when it comes to wireless, Bluetooth is quickly becoming the way to go. Bluetooth modules are getting quite inexpensive and every smart phone has it built in these days. Techbitar has written a great Instructable that
Before you watch the video below have a close look at the picture above and guess how this was done. There are 3 slots cut into a piece of wood, there is a real solid nail placed in the wood. Each section of wood including the outer sections are solid (just as it looks). You would not be able to remove the nail by sliding it. This was a
Rich Olson was needing a new shifter for his bike, instead of heading down to the bike shop to buy one he just fired up the 3D printer and printed up a new one. It is a friction based shifter which I remember having and preferring more than the click shifters you tend to see these days. With a friction shifter you simply move it to the position you
 Using some guidance from this page, BrittLiv has built one great looking Nerf Vulcan Sentry Gun! The spring has been swapped out to allow for more powerful and higher speed dart. The targeting looks like it is fun since it will track people and actively fire on them unless they are wearing the Instructables logo on their shirt!
We have seen all sorts of flashlights that don’t need batteries, the first style I remember was the squeeze generator type. Then the shake flashlight seemed to be all the rage, they were so popular that there were even a bunch of fake battery operated ones sold. The one thing I have never seen before was a hand heat powered flashlight. Anne, who is a 15 year old from
