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The Virtual Laser Keyboard (VKB) is a revolutionary accessory (The only keyboard that operates in total darkness - see the picture below) for Blackberry, Smartphone, PDA, MAC & Tablet PC. These are virtual keyboards that can be projected and touched on any surface. The keyboard watches your fingers move and translates that action into keystrokes in the device. Most systems can also function as a virtual mouse. Keyboard projector A holographic element illuminated by a red diode laser produces a template of the keyboard. Illumination Module An infrared plane of invisible light is generated just above and parallel to the surface of the keyboard.When a key is touched light is reflected from this plane and directed towards the sensor module. Sensor module Reflected light from the illumination module is passed through an infrared filter and imaged on to a sensor chip which determines the location of the light.It can process and interpret several keystrokes simultaneously. Working The dev

The project, Ring based home automation system, aims at controlling the status of devices using series of missed calls made to a land phone. The system can either turn on or off any number of devices. Any device either electrical or electronic or both may be controlled, which makes the system ideal for offices or factories also. The mode of operation and the device itself is selected using missed calls only. Since no call is connected, there is no operational cost for the system baring the power losses. Three sets of missed calls must be made; the first one is for activating the system which also acts as a password for the system. The second set is for selecting the mode of operation and the third one is for selecting the device to be controlled. Even though automatic systems are common, it has not taken to a level to control simple operations such as controlling the electrical appliances of a home, but this system will be a difference. The system is cheapest and easiest automation sol

Is there any possibility f observing any radiation other than light with our eyes?The answer is yes, but our bandwidth is limited & the light sensor (eye) we have senses only the radiation falling in the range of bandwidth.So a possibility is here to translate the frequencies we want to observe to the frequencies we can see.Such a device may make sense in the later world ,but now it may feel not digesting.Me and Arun Prabhakar observed the IR rays with the help of sony erricson mobile camera,even though the actual reason ,we didn't know,the process happened anyway.After some years there will be ppl wearing some helmet that could permit easy view of the whole em spectrum.

An automatic lighting system , an automatic temperature control system and status monitoring system is described here. The automatic lighting system is implemented with the help of a state synthesizer , which generates the next state with the help of present state and sensor inputs. For the purpose a program is written and the artificial intelligence is created by burning that program into a microcontroller that emulates the function of a state synthesizer. Here due to the project limitations we are introducing the intelligence to four sections of the room in which automatic lighting is to be brought. The room is logically divided into 3,namely c0,c1,c2(c=cell)equally. And the logical partition is based on two quantity-sensor pairs (like laser-LDR or IR-IR Sensor) namely,l0&l1.There is two sets of quantity-sensor pairs at the door side to detect the direction of travel of the humans(l2&l3). After the state identification, we need to glow the corresponding array of

A medium for feeding data into a computer, essentially a card punched with holes or notches to represent letters and numbers or with a pattern of holes to represent related data. Also called Hollerith card .This definition is old now the definition is another one with code lock implementation.punched cards can be used as door-open cards provided there is a ckt designed to decode the code using any logic the coding can be done in a number of ways as in the case of program encryption. A simple punched card-reader mechanism can be emulated with the help of an array of LED -LDR pairs connected so as to make the card an intermediate b/w the pairs .ie card can be inserted in b/w these two to open the door.presence or absence of a hole can be detected by the ldr very easily. But the reader will be a bulky one to make this compact we may use some approximations with the ldr array we can process the signals from ldrs and find some real number corresponding to the punches and their positions

A Light Dependent Resistor ( LDR, photoconductor, or photocell) is a device which has a resistance which varies according to the amount of light falling on its surface. They will be having a resistance of 1 MOhm in total darkness, and a resistance of a 1 to 10 of kOhm in bright light. A photoelectric device can be either intrinsic or extrinsic. Applications: An LDR can even be used in a simple remote control circuit using the backlight of a mobile phone to turn on a device - call the mobile from anywhere in the world, it lights up the LDR, and lighting can be turned on remotely! Light Dependent Resistor Circuits: There are two basic circuits using light dependent resistors - the first is activated by darkness, the second is activated by light. In the circuit diagram on the left , the led lights up whenever the LDR is in darkness . The 10K variable resistor is used to fine-tune the level of darkness required before the LED lights up. The 10K standard resistor can be changed as require