Hardware Tech

Hardware


Human-Computer Interface Devises-

Human-computer interface devises are the way the person interacts with the devise it can be something like a mouse & keyboard, or joystick. There are several key design points of these devises such as ergonomic design and button configurations as an example I will compare a ball mouse to an optical mouse.

Firstly how the manual ball mouse works, there is a ball in a piece of housing with two rollers that detect X and Y movement, these are connected to an optical encoding disk now the movement of this is read by a infrared LED sensor this then generates signals that are sent to the on-board processor chip that then feeds back and makes the cursor move. There however a few issues with using one of these mice, dust really likes getting into them and clogging up the rollers really reducing responsiveness and sensitivity which in comparison to the optical mouse is already very low, optical mice are pretty much a straight up improvement on ball mice.    
  
Optical mice however work using a much different design feature, optical mice use a tiny camera that takes around 1500 pictures every second making it able to work on almost any surface, it uses a small red LED to bounce light of the surface it is on back into its CMOS sensor. It uses a digital signal processor to detect whether or not the mouse is moving or not and responds on screen.

Some advantages include:

Less chance of devise failure, due to no moving parts.
No mouse mat required.
More responsive.

 Some mice like this Razer Imperator have a special user cantered design, during all of its development history tests where taken to find the most commonly used mouse grip style and built a mouse to fit around the ergonomics of that. This mouse in particular has varying height settings allowing the user to find the most comfortable grip possible hence why it has a £64.99 price tag...