An Linear hall sensor consists of Hall element, linear amplifier, and emitter follower and it outputs analog values.If you add a comparator to Linear hall sensor it will be able to output both analog and digital signals.we call it as analog hall sensor .
Principles
when the sensor approaches the magnet, the value of pin A0 will change. When the value exceeds the threshold set by the potentiometer before, D0 outputs low level and the corresponding LED lights up.
Features
1) Signals are output as long as there is a conductor cutting the magnet field.
2） High precision and good linearity
3） Adjustable sensitivity (accurate adjustment)
4） Working voltage: 5V，PCB size: 2.3 x 2.3 cm
5） With power light and signal output indicator
Application
The module can be applied to measurement of some physical quantities such as displacement, current, etc.
Advantages
A Hall effect sensor may operate as an electronic switch.
• Such a switch costs less than a mechanical switch and is much more reliable.
• It can be operated up to 100 kHz.
• It does not suffer from contact bounce because a solid state switch with hysteresis is used rather than a mechanical contact.
• It will not be affected by environmental contaminants since the sensor is in a sealed package. Therefore it can be used under severe conditions
. In the case of linear sensor (for the magnetic field strength measurements), a Hall effect sensor:
• can measure a wide range of magnetic fields
• is available that can measure either North or South pole magnetic fields
• can be flat
