Keyboard
Skills in using and operating input devices are replacing the skills of manual drafting. This equipment instructs the computer to draw lines and circles of various widths and sizes and apply such graphics as symbols, dimensions, and notes.
Keyboards
The keyboard allows you to input data for:
Every CAD system provides a means to select a variety of commands that allow the user to manipulate objects within the drawing. This can be done via a command line (commands entered using a keyboard) or by selecting buttons or icons in the case of a graphical user interface.
Keyboard
Mice
This is the most popular type of cursor control. The mouse rolls across a flat surface and allows for the selection of drawing objects, menu items or buttons on the screen.
Mouse
Light Pens
A light pen is used as a direct entry input pointing device. The pen is electronic and contains a photocell sensory element to detect the presence of light. Attached through one end is a cable through which the signal is transmitted. The light pen works much like a mouse. It allows you to select drawing objects, menu items or buttons directly on the screen or on a digitizing tablet.
Light Pen1
Graphics Tablets
A graphics tablet is a flat surface area electronically sensitized beneath the surface. Beneath the surface lies a grid pattern of horizontal and vertical sensors. When proper contact is made on the surface, electrical impulses are transmitted to the computer.
Digitizing Tablet with Puck2
1 & 2Courtesy of CalComp