Connecting a computer to a projector used to be a simple matter of simply stringing a heavy cable between the Video Graphics Adapter ports on the two devices. In many cases, this is still an excellent way to make a connection. However, today's computers and projectors offer a number of different ports that can make it possible to use easier-to-handle cables or even do to more by taking advantage of projector audio capabilities or remote control features.
Video Graphics Adaptor
While it is gradually being phased out from some computers as of 2012, the VGA port has been the standard way to connect computers and video output devices like projectors since the late 1980s. It has a sturdy 15-pin connector with two rows of pins arranged in a trapezoidal shape. VGA ports frequently have thumbscrews to let you tightly secure the connector.
When your projector has a built-in sound system, you can send your computer's audio to it by using the line-out jack on your computer. This jack accepts a one-eighth inch or 3.5 mm-wide plug similar to the ones on earbud headphones. You use a cable with two 3.5 mm plugs to connect it to your projector's audio input. Line-out jacks may be labeled with a speaker with an arrow or with a picture of headphones and are frequently color-coded with a light-green surround.
High Definition Multimedia Interface
The HDMI port on many computers can be a better way to connect a projector. HDMI carries very high resolution images, including copy-protected high definition video streams. On some computers and projectors, it can also carry an audio signal, letting your use your projector's speakers without having to run an audio cable. Finally, HDMI cables are smaller and lighter than VGA cables and are easier to securely connect and to disconnect.
Universal Serial Bus
Many projectors now have remote control capability. For some, you can use your computer to control the projector's menu system. Others let you use the projector's remote control as a presentation remote or as a mouse for your computer. In either case, using this feature requires connecting the projector's USB plug to an open USB port on your computer.
Solomon Poretsky has been writing since 1996 and has been published in a number of trade publications including the "Minnesota Real Estate Journal" and "Minnesota Multi-Housing Association Advocate." He holds a Bachelor of Arts, cum laude, from Columbia University and has extensive experience in the fields of financial services, real estate and technology.
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