Various Types of Pointing Devices
The Mouse	The mouse is the beginning standard for most pointing devices. The traditional mouse requires that the user perform three tasks at once – grasp the mouse, move the mouse and click the mouse button at the same time. Available in infinite styles and colors – the basic elements will be an internal encoder wheel moving past photo diodes and LEDs, a ball on the bottom of the case to move against the mouse pad, and several buttons (right, left and sometimes center) for selecting options or drop-down menus. New ideas into the marketplace feature scroll wheels, more ergonomic and attractive designs, optical interface with the surface for higher reliability (instead of the ball touching the mouse pad and periodically getting gummed up) and wireless communication (IR or RF) with the host.
Trackballs zoom image	Since there are limitations to providing the motions required to activate the traditional mouse, trackballs were invented. Some limitations, for example, resulted from reduced desktop space, possible lack of access to a flat surface for commuters, or real physical handicaps of some people that made them incapable of motion with their arms. Sometimes called “Roller balls”– trackballs are best described if you first turn the traditional mouse over to expose the ball. Instead of having the ball rest below with the motion activated by your hand, the ball rests on top with the motion activated by your fingers. All of the internal components and outside custom peripheral options remain the same as those available on the mouse. Often the choice between a mouse and a trackball is just an operator preference.
Joysticks zoom image	When space becomes even more of a constraint or range of motion is further limited, joysticks are used. In this case, continuous or dynamic motion is provided through moving a lever or “stick” in the direction of motion desired for the system or cursor. The button selection functions can be provided alongside the joystick, similar to those on the mouse.
Micro Joysticks zoom image	When space is at a premium, several suppliers in the marketplace provide miniature joysticks that are accessed with the motion of your finger. Sensitive to touch and easily located between two keytops, these miniature joysticks have become quite popular on laptop keyboards and are easily located beneath a protective surface if environmental conditions warrant.
FSR Devices zoom image	When space and height are both limiting parameters, a FSR (Force Sensing Resistors) device fits easily under a button or elastomer keypad – where it can be protected from the environment or from side angle breakage (see image). The device that records movement is a resistive layer, much like a touch screen in actuation and thickness, that is thinner than the mechanical encoders found on your trackball or mouse.

Advanced Input Systems – Providing More Controls for Keeping Your Customers

We trust that this overview of sample pointing devices has been instructional. Bear in mind that it was not meant to be comprehensive, but a sampler of some available options for your next project.

As the leader in custom input integration, Advanced Input Systems would like to help meet your design needs for all areas of pointing devices – and implement their custom integration into various keyboard or systems applications. We’ve developed over 2000 custom input systems for more than 1000 companies during the past 25 years. Our engineers are proficient with the most current technologies in the field and understand how to integrate those technologies. Advanced Input Systems will effectively meet the requirements of your customer.

Create or enhance your unique product requirements with an experienced team leader: Advanced Input Systems.