P
pandy
- Jan 1, 1970
- 0
From the information I search from internet, Cycle computer sensor
used in the real world may fall into three catalogs: reed switch or
Hall effect
sensor, or Magnetic Resistor.
Reed switch seems a mechanical switch that can switch on when
magnet comes and off when it goes.
Reed switch
++ advantage:
simple, easy to interface to circuit,
no power consumed.Only two-wire need to interfaced to
circuit.
Hall-Effect Sensor:
++ advantage:
more stable, long life, electrical(not mechanical),
Can change three wires to two wire interface.
accept higher frequency detecting.
++ disadvantage:
Comsume more power.
Known little about another one : magnetic resistor.
It is difficult to choose one from these three kinds. I wonder
which kind
the industry adopt.
The commersial cycle computer product such as VETTA and Sigma
have every long usage time in a lifte of CR1023 battery. If they use
Hall-Effect
sensor, (since Hall-Effect sensor consume much current) how can they
reduce power comsumption?
Is reed switch stable enough for cycle computer ( they of cause do
not
satisfy for speed sensor in a car)?
Which is the best choice?
used in the real world may fall into three catalogs: reed switch or
Hall effect
sensor, or Magnetic Resistor.
Reed switch seems a mechanical switch that can switch on when
magnet comes and off when it goes.
Reed switch
++ advantage:
simple, easy to interface to circuit,
no power consumed.Only two-wire need to interfaced to
circuit.
Hall-Effect Sensor:
++ advantage:
more stable, long life, electrical(not mechanical),
Can change three wires to two wire interface.
accept higher frequency detecting.
++ disadvantage:
Comsume more power.
Known little about another one : magnetic resistor.
It is difficult to choose one from these three kinds. I wonder
which kind
the industry adopt.
The commersial cycle computer product such as VETTA and Sigma
have every long usage time in a lifte of CR1023 battery. If they use
Hall-Effect
sensor, (since Hall-Effect sensor consume much current) how can they
reduce power comsumption?
Is reed switch stable enough for cycle computer ( they of cause do
not
satisfy for speed sensor in a car)?
Which is the best choice?