Wireless power transfer is nothing new; it has been discussed since Tesla`s patent in 1900 entitled `Apparatus for Transmission of Electrical Energy` (USPTO #649, 621). However, as the technology matures, it will be interesting to see what myriad applications arise. For example, Intel`s system is capable of transmitting up to 60 Watts (the demo of lighting an incandescent bulb)
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around 75% efficiency. They hope to one day use the system to remotely charge laptops. Meanwhile for robotics, wireless power has the capability to transform research and applications involving swarms of small (mini/micro) robots. When dealing with robot swarms numbering in the hundreds or even just a dozen, tethering is impractical and changing batteries is cumbersome. By way of an example, consider the battery-powered robot swarm by Caprari from EPFL in Switzerland, where they have ~100 robots operating simultaneously. Hooking up 100 robots for battery charging does not sound like such a fun prospect - more importantly, it is a significant research impediment. Instead, it is possible to use inductively-coupled wireless power, in a manner similar to Low-Frequency (125kHz) RFID, to power the swarm or just to perform simultaneous, contact-less battery recharging. This is the goal of the work presented by Deyle (myself) and Reynolds in Surface based wireless power transmission and bidirectional communication for autonomous robot swarms. What`s great about this work is that the fundamental design is straight-forward, and can be prototyped using discrete components and basic microcontrollers, making the technology available to researchers and hobbyists alike. The surface is outfitted with a transmit coil. This coil operates in resonance to increase the circulating current and thus increase the magnetic flux - providing...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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