Checkpoint LAB USB-RS232 Manual do Utilizador descarregar pdf (Página 5)

HALL EFFECT SENSOR

Rotation Movement

• Uses internal magnetic fields.

• External rotation blocks and unblocks a metallic

slotted plate which changes the magnetic field and

creates high and low voltage levels.

• Like optical sensors, these are non-contact sensors.

Both are accurate.

• Hall effect is better in extreme environmental

conditions. Optical sensors need to stay clean. Hall

effect relies on a magnetic field so oils, water, dirt,

fumes, heat have little or no effect.

• Micro-amp power – may be passive (non-powered)

• CMOS IC subminiature sized for ease of mounting,

inexpensive.

• Used in automotive, robotics, biomedical, industrial.

• Rotational or touch, touchpads.

ANGULAR PLACEMENT: ENCODERS

• Optical , hall effect or magnetic,

potentiometers

• Can measure rotation (i.e. cw, ccw)

• Can measure home position.

• Detailed theory of encoders:

http://www.automationdirect.com/

static/manuals/d4hsc/appxa.pdf

http://www.lynxmotion.com/p-653-

gear-head-motor-12vdc-301-

200rpm-6mm-shaft.aspx

http://www.pololu.com/catalog/pr

oduct/1442

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Checkpoint LAB USB-RS232 Manual do Utilizador Página 5