Sensor question
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Posts: 46,084
To control the filling level of a sawdust bin I am looking for a sensor.
I heard people use a slowly turning motor with a paddle, I guess when it
stalls in the dust the current goes up and this signal can be processed
further.
Where do I find such a device. What type of motor can be used for this purpose
without burning it up in the process??
TIA
Uwe
I heard people use a slowly turning motor with a paddle, I guess when it
stalls in the dust the current goes up and this signal can be processed
further.
Where do I find such a device. What type of motor can be used for this purpose
without burning it up in the process??
TIA
Uwe
Comments
To control the filling level of a sawdust bin I am looking for a sensor.
I heard people use a slowly turning motor with a paddle, I guess when it
stalls in the dust the current goes up and this signal can be processed
further.
Where do I find such a device. What type of motor can be used for this
purpose without burning it up in the process??
TIA
[noparse][[/noparse]Non-text portions of this message have been removed]
sort of reflection off of this!
Disect your bin with a long thin bar with the sensor in the middle and
monitor your dump height....
Original Message
From: othello159 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=DrPB0T93NBe8KodUIg0pumhoWOd58yvvUq3_DRalUjcQ1GMaEy4oKDCdC9wRLLMMYHWC35Pusb77SjHYwQ]othello159@h...[/url
Sent: October 23, 2003 1:46 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Sensor question
To control the filling level of a sawdust bin I am looking for a sensor. I
heard people use a slowly turning motor with a paddle, I guess when it
stalls in the dust the current goes up and this signal can be processed
further.
Where do I find such a device. What type of motor can be used for this
purpose without burning it up in the process??
TIA
Uwe
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am interested in the particular moment where sawdust is not only all over but
starts to pack. That is why the paddle motor seemed to make sense since I
imagine it senses density and ignores light density dust.
Uwe
--- In basicstamps@yahoogroups.com, "Brady,Steven [noparse][[/noparse]PYR]" <steven.brady2@e...>
wrote:
> Would ultrasonic work for this? Sawdust?? Hmmm....there'd have to be some
> sort of reflection off of this!
>
> Disect your bin with a long thin bar with the sensor in the middle and
> monitor your dump height....
>
>
>
>
Original Message
> From: othello159 [noparse][[/noparse]mailto[noparse]:o[/noparse]thello159@h...]
> Sent: October 23, 2003 1:46 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] Sensor question
>
>
> To control the filling level of a sawdust bin I am looking for a sensor. I
> heard people use a slowly turning motor with a paddle, I guess when it
> stalls in the dust the current goes up and this signal can be processed
> further.
>
> Where do I find such a device. What type of motor can be used for this
> purpose without burning it up in the process??
>
> TIA
>
> Uwe
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
> Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
"packed" state or gets to the packed state the mass (weight) will also be
measureably more than unpacked. Parallax sells a force sensor called the
flexiforce that
is easy to use with the RCTIME command and may work well for your application.
see http://www.parallax.com/detail.asp?product_id=30056
ken
________________________________________________
I don't know, I would be afraid of false alarms. There is sawdust all over
and I am interested in the particular moment where sawdust is not only all over
but starts to pack. That is why the paddle motor seemed to make sense since I
imagine it senses density and ignores light density dust.
[noparse][[/noparse]Non-text portions of this message have been removed]
silos and holding bins they use shaded pole motors geared down to
only 1 or 2 revolutions a minute. The shaft that rotates inside the
silo is stopped when the level reaches the paddle attached to the
shaft. The shaft continues to move adding torque to the shaft that is
spring loaded when that torque overcomes the spring it trips a limit
switch (micro switch) that also stops the motor.
Jean-Louis
othello159 wrote:
>To control the filling level of a sawdust bin I am looking for a sensor.
>I heard people use a slowly turning motor with a paddle, I guess when it
stalls in the dust the current goes up and this signal can be processed
further.
>
>Where do I find such a device. What type of motor can be used for this purpose
without burning it up in the process??
>
>TIA
>
>Uwe
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>
>
way too great to be used as an indicator.
For there could be heavier kinds of wood chips, or wet wood chips and all of
that throws this approach off.
I searched around and found that this type of indicator is extensively used by
silo people and they call it a rotary paddle bin monitor and god is it
expensive. We are not talking a $2 chip, we are talking about a solidly built
$200 + motor unit.
Maybe for now I have to continue sticking my head in there for a visual check
every now and then...
Uwe
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> If it is safe to assume that when the amount of sawdust approaches the
> "packed" state or gets to the packed state the mass (weight) will also be
> measureably more than unpacked. Parallax sells a force sensor called the
flexiforce that
> is easy to use with the RCTIME command and may work well for your application.
>
> see http://www.parallax.com/detail.asp?product_id=30056
>
> ken
>
> ________________________________________________
> I don't know, I would be afraid of false alarms. There is sawdust all over
> and I am interested in the particular moment where sawdust is not only all
over
> but starts to pack. That is why the paddle motor seemed to make sense since I
> imagine it senses density and ignores light density dust.
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
wrote:
> To control the filling level of a sawdust bin I am looking for a
sensor.
> I heard people use a slowly turning motor with a paddle, I guess
when it stalls in the dust the current goes up and this signal can
be processed further.
>
> Where do I find such a device. What type of motor can be used for
this purpose without burning it up in the process??
>
> TIA
>
> Uwe
Pretty much any DC motor could be used, just current limit the power
to it and put a hall effect senosr on the shaft.
a clutch would work too if the sensor was on the thing moving.
either way, reverse the direction upon stopping to prevent some stray
bunching from a flase alarm.
and cut power shortly after a known stop.
A sonic system would be 'heard' across the faling fill, but muffled
when one side is packed, that is if you can locate the sensors under
the upper limit.
http://www.plctalk.net/qanda/arch/topic/121.html
Oorspronkelijk bericht
Van: othello159 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=45Fyp3IvbZWEk_YcL3EYSyOmmcbQ5M4KigNirUAcaXnN5ofbGyJxrdElSQUaB5o9Lrb-DPcnFAo82JThC8uW]othello159@h...[/url
Verzonden: donderdag 23 oktober 2003 22:46
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] Sensor question
To control the filling level of a sawdust bin I am looking for a sensor.
I heard people use a slowly turning motor with a paddle, I guess when it
stalls in the dust the current goes up and this signal can be processed
further.
Where do I find such a device. What type of motor can be used for this
purpose without burning it up in the process??
TIA
Uwe
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Sorry if I'm repeating ideas...haven't gone through the entire thread yet.
But have a number of IR Tx'ers along one side and Rx'ers on the other side.
This would give you a resolution to at least know when you are getting close
to filling your tank....
Original Message
From: othello159 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=gQJJpz73g-nSeLledK3f7Z8xMn3YilvCk7PzRyzOtjEWBLyJkZmx8xxu301NaHmdIghd34gfJ5AeAGf-]othello159@h...[/url
Sent: October 24, 2003 05:48
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Sensor question
Yes, thats what I thought too, but the range of weight of one full bin is
still way too great to be used as an indicator. For there could be heavier
kinds of wood chips, or wet wood chips and all of that throws this approach
off.
I searched around and found that this type of indicator is extensively used
by silo people and they call it a rotary paddle bin monitor and god is it
expensive. We are not talking a $2 chip, we are talking about a solidly
built $200 + motor unit.
Maybe for now I have to continue sticking my head in there for a visual
check every now and then...
Uwe
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> If it is safe to assume that when the amount of sawdust approaches the
> "packed" state or gets to the packed state the mass (weight) will also
> be measureably more than unpacked. Parallax sells a force sensor
> called the flexiforce that is easy to use with the RCTIME command and
> may work well for your application.
>
> see http://www.parallax.com/detail.asp?product_id=30056
>
> ken
>
> ________________________________________________
> I don't know, I would be afraid of false alarms. There is sawdust all
> over and I am interested in the particular moment where sawdust is not
> only all over but starts to pack. That is why the paddle motor seemed
> to make sense since I imagine it senses density and ignores light
> density dust.
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
To UNSUBSCRIBE, just send mail to:
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