Опубликовано 2013-05-07 17:15:50 автором Ruslan
Connecting the Hall sensor to the microcontroller
Hall Sensor - is a magnetic field sensor . Its operating principle is the effect Hall :
If the magnetic field put the plate and current to pass through it , the electrons in the plate will be rejected ( Lawrence force ) is perpendicular to the current direction . From this it follows that one edge of the plate will be more electrons than the other s . This means that there is a potential difference (voltage) , this voltage can be enhanced and izmerit.Datchiki Hall There are two kinds digital 
and analog 
Digital sensors Hall - with it you can detect the presence of magnetic field. They allow the output 0 - when the magnetic field is below the lower threshold , or 1 - when the magnetic field higher than the upper threshold. Between the lower and upper threshold of sensitivity zone is not there (hysteresis) to avoid false positives Hall sensor . Digital Hall sensors do more : - Unipolar - included the magnetic field of a certain polarity and off at lower field induction
- Bipolar - included one field polarity, and off the field of opposite polarity.
Applications Hall sensor can think of many :
- as contactless limit switches ( as a replacement reed switch )
- speed sensor rotation (eg motor )
- for measuring currents in conductors ( current sensors )
- motor control ( determining the position of the rotor in the valve engines )
- as magnetic float ( liquid level measurement )
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