Rpm sensor (inductance type?)
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Does anyone know what type of a component I can use for an inductance
sensor (kind used in like automotive timing lights) I would like to
generate a logic pulse per voltage pulse for use in a Basic stamp
Tachometer for use on small engines. Will se up to absol. max 10,000
rpm's. Any body have any ideas. Otherwise does anyone have a good
expanation of how a hall effect sensor works and if i could use it to
send a pulse out as the magnet of the flywheel spins past the sensor.
There will be varrying amounts of light and dark so an opto sensor
will not work for it.
THanks all
sensor (kind used in like automotive timing lights) I would like to
generate a logic pulse per voltage pulse for use in a Basic stamp
Tachometer for use on small engines. Will se up to absol. max 10,000
rpm's. Any body have any ideas. Otherwise does anyone have a good
expanation of how a hall effect sensor works and if i could use it to
send a pulse out as the magnet of the flywheel spins past the sensor.
There will be varrying amounts of light and dark so an opto sensor
will not work for it.
THanks all
Comments
transformers, usually constructed with two ferrite core pieces. One is
typically a "U" shape, with several turns of wire on it, mounted in the
non-moving side of the probe assembly. The other is a bar shape, mounted in
the articulated side of the probe so that the magnetic loop closes around
your test wire when the probe handle is released. Pulses output from the
probe winding are amplified and shaped as desired (winding load resistance
has a profound effect on output voltage and bandwidth). A simple comparator
or clipping amplifier may be all you need to get logic level pulse output.
Old switch-mode power supplies and TV sets are good sources for ferrite
cores, if you're into hacking. Fair-Rite <http://www.fair-rite.com/> and
Amidon <http://www.amidoncorp.com/> are sources for new cores in various
materials & sizes. A pair of "U" cores might be a good choice. A toroid
core could be sliced to make two separable halves, but a diamond saw is
probably required. Otherwise, you could try some of the EMI suppression
core sets that are sold at Radio Shack, etc. The material isn't intended
for transformer duty, but it might work well enough...
>Does anyone know what type of a component I can use for an inductance
>sensor (kind used in like automotive timing lights) I would like to
>generate a logic pulse per voltage pulse for use in a Basic stamp
>Tachometer for use on small engines. Will se up to absol. max 10,000
>rpm's.
Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
Manufacturer of the famous BOB-II Serial Video Text Display Module!