Sensors and other devices

By marius

•OMR•Web cam•Light pen•Light sensor

OMR(optical mark recognition)

Uses This device is used to mark big multiple choice papers

Advantages• An OMR scanner can maintain

a throughput of 1,500 to 10,000 forms per hour. This can be controlled by a single PC workstation

• It consistently provides unmatched accuracy when reading data

• data can be recorded on an OMR form even when a PC or network goes down.

Disadvantage• Uses electricity

Web cam

UsesIt can be used for live video streaming with people in other country's or for business meetings

Advantages

• can be an extremely valuable tool when connected with the Internet

• Web cameras allow people to have the sensation that they are in close contact with another person

Disadvantages • Relies on the internet • People might rely on webcams to much

and there social skills could slip away

Light pen

UsesThey are used to draw directly onto the screen

advantages • Can draw directly on the screen

• Light pens are easy to use

• They have extremely good positional accuracy on a computer screen

• When used for bar code reading, they are lightweight, able to come in direct contact with the bar codes and have no moving parts.

Disadvantages • Light pens are easily damaged

• They can only be used on some computer screens

• they do not work with LCD screens

• They usually lack high resolution capability

Light sensorsUsesThey are used to sense the amount of light going through the sensor and produces an output signal