Mouse is one of the most important peripheral for computers, especially for those which are not touch screen based. Fascinating is the concept that how various types of computer mice are available depending on the need, shape, pointing technology etc. There was a time when only ball mouse was prevalent. A proper surface was…
The first ever mouse was made by Douglas Engelbart of Stanford Research Center in 1963. It was one of the major inventions in computing world which supported keyboard to a large extent, making the experience of working on computer easier and faster. Since its invention different technologies have been developed to improve the efficiency of a mouse. A ball mouse is a type of electro mechanical device which uses a small ball as the key component to determine its movements and speed.The backside portion of the mouse shows the ball which is the heart of the ball mouse. When placed over a surface it rotates with the movement of the mouse. The ball mouse needs a flat surface with enough friction for smooth rotation of the ball and hence is generally accompanied with a mouse pad.
The replacement of conventional ball mouse by the technically superior optical mouse is not hidden to anybody. An optical mouse works by having a low resolution camera inside it which takes around 1500 to 6000 pictures per second of the surface beneath it, and by analyzing these images, it calculate the position, speed and movement of the mouse.When a mouse is connected with the computer, a red LED starts glowing. This light is focused on the surface beneath the mouse by a special type of lens (HDNS-2100). The reflected light falls back to the camera integrated in Optical Mouse Sensor. The camera takes images of the surface with a frequency in the range of 1500 to 6000 images per second to calculate the position of mouse.
This project demonstrates the use of a accelerometer as a computer mouse,but first what is an accelerometer? Its a device that can measure acceleration and the pull of gravity.There are multiple ways of doing this, the particular one I’m using works with the capacitive method. Inside the chip is a capacitor with an extra plate in the middle that can move. As you know the closer the objects are together the bigger the capacitance, the circuit inside the chip measures the capacitance difference between the two plates and the middle one.