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Discussion Groups | 68HC12 | off topic - motor speed (RPM) sensor

Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).

off topic - motor speed (RPM) sensor - Vien Nguyen - Apr 21 18:47:00 2003

hi all,

my apology, but I need your help here. I've been searching on the web to
find a (magnetic type) sensor which I could attach it to a motor to measure
the motor speed (RPM). I found some from Honeywell, but those industrial
sensors are too expensive for my budget. Could someone please point me to
the right place to find a cheap sensor for my experiment?

Thank you for your help in advance and I really appreciate your kindness.

regards,

Vien Nguyen.


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Re: off topic - motor speed (RPM) sensor - Author Unknown - Apr 21 19:03:00 2003

In a message dated 4/21/03 7:46:11 PM Eastern Daylight Time,
writes:

> I've been searching on the web to
> find a (magnetic type) sensor which I could attach it to a motor to measure
> the motor speed (RPM).

Digi Key has Hall Effect sensors that will detect a magnet passing by. Or you
could use an opto interrupter, or a photocell and a lamp [Non-text portions of this message have been removed]



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Re: off topic - motor speed (RPM) sensor - Nigel Johnson - Apr 21 19:31:00 2003

How much is your budget? I have used Hall sensors from Cherry at about $15
each. They consist of a threaded metal tube and a locknut so you can mount
them in a piece of metal next to the shaft, and be triggered by an imbedded
magnet or spoked wheel. They give a dounconced TTL signal out, ready for
an input port. They are available from Future-active although since they
re-organised their web site I can't find anything.

If that's within your budget, let me know and I will look for the bill and
get the part number.

cheers

Nigel Johnson

At 16:47 03-04-21 -0700, you wrote:
>hi all,
>
>my apology, but I need your help here. I've been searching on the web to
>find a (magnetic type) sensor which I could attach it to a motor to measure
>the motor speed (RPM). I found some from Honeywell, but those industrial
>sensors are too expensive for my budget. Could someone please point me to
>the right place to find a cheap sensor for my experiment?
>
>Thank you for your help in advance and I really appreciate your kindness.
>
>regards,
>
>Vien Nguyen. >--------------------------------------------------------
>To unsubscribe from this group, send an email to: >To learn more about Motorola Microcontrollers, please visit
>http://www.motorola.com/mcu



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Re: off topic - motor speed (RPM) sensor - MTG - Apr 21 20:23:00 2003

I think you can buy the guts of the Honeywell sensors in TO-92
package format for a buck or two at Digi-Key.

GB

----- Original Message -----
From: "Vien Nguyen" <>
To: <>
Sent: Monday, April 21, 2003 4:47 PM
Subject: [68HC12] off topic - motor speed (RPM) sensor > hi all,
>
> my apology, but I need your help here. I've been searching on the web to
> find a (magnetic type) sensor which I could attach it to a motor to
measure
> the motor speed (RPM). I found some from Honeywell, but those industrial
> sensors are too expensive for my budget. Could someone please point me to
> the right place to find a cheap sensor for my experiment?
>
> Thank you for your help in advance and I really appreciate your kindness.
>
> regards,
>
> Vien Nguyen. > --------------------------------------------------------
> To unsubscribe from this group, send an email to: > To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu



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Re: off topic - motor speed (RPM) sensor - Ed Taylor - Apr 21 20:38:00 2003

hi:

if you want some "sweat equity" method to reduce the project to it's
elements you could use the HAL300UA-E micronas hall effect transistor ($2
usf from digikey), drill a hole and mount a magnet on a pully in the engine
system.

regards and good luck on your project,

ed
----- Original Message -----
From: "Nigel Johnson" <>
To: <>
Sent: Monday, April 21, 2003 6:31 PM
Subject: Re: [68HC12] off topic - motor speed (RPM) sensor > How much is your budget? I have used Hall sensors from Cherry at about
$15
> each. They consist of a threaded metal tube and a locknut so you can
mount
> them in a piece of metal next to the shaft, and be triggered by an
imbedded
> magnet or spoked wheel. They give a dounconced TTL signal out, ready for
> an input port. They are available from Future-active although since they
> re-organised their web site I can't find anything.
>
> If that's within your budget, let me know and I will look for the bill and
> get the part number.
>
> cheers
>
> Nigel Johnson
>
> At 16:47 03-04-21 -0700, you wrote:
> >hi all,
> >
> >my apology, but I need your help here. I've been searching on the web to
> >find a (magnetic type) sensor which I could attach it to a motor to
measure
> >the motor speed (RPM). I found some from Honeywell, but those industrial
> >sensors are too expensive for my budget. Could someone please point me to
> >the right place to find a cheap sensor for my experiment?
> >
> >Thank you for your help in advance and I really appreciate your kindness.
> >
> >regards,
> >
> >Vien Nguyen.
> >
> >
> >--------------------------------------------------------
> >To unsubscribe from this group, send an email to:
> >
> >
> >To learn more about Motorola Microcontrollers, please visit
> >http://www.motorola.com/mcu
> >
> >
> >
> --------------------------------------------------------
> To unsubscribe from this group, send an email to: > To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu




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Re: off topic - motor speed (RPM) sensor - Robert Smith - Apr 21 21:32:00 2003

Have you considered optronic interrupters?

Or, perhaps, a low cost shaft encoder?

Bob Smith

--- Avoid computer viruses, Practice safe hex ---

-- Specializing in small, cost effective
embedded control systems --

http://www.smithmachineworks.com/embedprod.html Robert L. (Bob) Smith
Smith Machine Works, Inc.
9900 Lumlay Road
Richmond, VA 23236 804/745-1065
----- Original Message -----
From: "Vien Nguyen" <>
To: <>
Sent: Monday, April 21, 2003 7:47 PM
Subject: [68HC12] off topic - motor speed (RPM) sensor > hi all,
>
> my apology, but I need your help here. I've been searching on the web to
> find a (magnetic type) sensor which I could attach it to a motor to
measure
> the motor speed (RPM). I found some from Honeywell, but those industrial
> sensors are too expensive for my budget. Could someone please point me to
> the right place to find a cheap sensor for my experiment?
>
> Thank you for your help in advance and I really appreciate your kindness.
>
> regards,
>
> Vien Nguyen. > --------------------------------------------------------
> To unsubscribe from this group, send an email to: > To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu




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RE: off topic - motor speed (RPM) sensor - Bob Furber - Apr 21 23:58:00 2003

Hi Bob

> Have you considered optronic interrupters?
>
> Or, perhaps, a low cost shaft encoder?

Isn't "low cost shaft encoder" an oxymoron? ;o)

Actually, I would be very interested if you have found such
a device outside of a mouse.

Bfn,

Bob Furber

__________________________________________________________

Connect your micro to the internet the easy way
www.microcommander.com

Microcontroller with an obscenity of I/O & features
..in a small footprint www.steroidmicros.com
__________________________________________________________



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Re: off topic - motor speed (RPM) sensor - Robert Smith - Apr 22 6:42:00 2003

Bob --

In the early days of shaft encoders when they appear to have been built
primarily for military and heavy duty industrial applications, I would have
agreed with you. However, the proliferation of embedded controllers in
everything, low cost MCUs, consumer demand for cheaper, dumber, and more has
created the inevitable economic pressures on the shaft encoder market places
like nearly all others related to embedded systems design. Since I
specialize in the small, low-cost sector here is some of my thinking.

First, I repost the original question ---

"I've been searching on the web to
find a (magnetic type) sensor which I could attach it to a motor to measure
the motor speed (RPM). I found some from Honeywell, but those industrial
sensors are too expensive for my budget. Could someone please point me to
the right place to find a cheap sensor for my experiment?" Note that original poster has omitted critical information like range of
shaft speeds, and expected lifetime. Thus, the question is open to a broad
range of suggestions.

I refer you to the latest DigiKey catalog # T032 for a sampling of what is
available these days.

Consider first, the Grayhill Series 61C, available off-the-shelf for $20.55
in Q/1.

Compared to where we were two decades ago, that is inexpensive.

Next, consider the Grayhill 63R series, 500 million cycle life, 256 PPR (64
lines), $51.29 (Q/1).

But, for the student with very shallow pockets, try the Grayhill 25L series.
Mechanical encoder, low speed, short life time, but for $4.70 it may be very
attractive for an "experiment".

With the exception of the Tosoku model on the next page ($30.00), the going
price for a an optical encoder with reasonable lifetime (whatever that means
in the open context of this question) seems to be about $40.00 in Q/1.

But the above is just a sampling. A little web searching should produce
many more examples.

Actually, if an exposed shaft is available the poster would do well to
consider a slotted disc and an interrupter module.

Bob Smith --- Avoid computer viruses, Practice safe hex ---

-- Specializing in small, cost effective
embedded control systems --

http://www.smithmachineworks.com/embedprod.html Robert L. (Bob) Smith
Smith Machine Works, Inc.
9900 Lumlay Road
Richmond, VA 23236 804/745-1065
----- Original Message -----
From: "Bob Furber" <>
To: <>
Sent: Tuesday, April 22, 2003 12:58 AM
Subject: RE: [68HC12] off topic - motor speed (RPM) sensor > Hi Bob
>
> > Have you considered optronic interrupters?
> >
> > Or, perhaps, a low cost shaft encoder?
>
> Isn't "low cost shaft encoder" an oxymoron? ;o)
>
> Actually, I would be very interested if you have found such
> a device outside of a mouse.
>
> Bfn,
>
> Bob Furber
>
> __________________________________________________________
>
> Connect your micro to the internet the easy way
> www.microcommander.com
>
> Microcontroller with an obscenity of I/O & features
> ..in a small footprint www.steroidmicros.com
> __________________________________________________________ >
> --------------------------------------------------------
> To unsubscribe from this group, send an email to: > To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu



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RE: off topic - motor speed (RPM) sensor - Vien Nguyen - Apr 22 14:07:00 2003

Hi all,

First, thank you all for your great and very helpful inputs.

I guest my budge for this sensor for my experiment is around $2, so I found
those at Honeywell (and Cherry's) too expensive for me; they range from $11
to over $100 (geeze ... ) . I am really happy now finding those Micronas'
Hall effect sensors at Digikey, thanks to your direction.

I am not sure which one is appropriate for my application, so I'd order
some of the HAL502, 503, and 505 series and play w/ them for now.
Basically, I'd attach them to a motor and monitor the RPM (just monitoring,
not controlling, for now). If you have used these before, please let me
know if there are any issue in real world application and stuff, since I've
never used these types of sensors before. All of your help would be much
appreciated.

Again, thank you all.

Regards,

Vien Nguyen.





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Re: RE: off topic - motor speed (RPM) sensor - Author Unknown - Apr 22 14:11:00 2003

In a message dated 4/22/03 3:09:19 PM Eastern Daylight Time,
writes:

> If you have used these before, please let me
> know if there are any issue in real world application and stuff, since I've
> never used these types of sensors before. All of your help would be much
> appreciated. Order some magnets while you're at it. Glue the magnet to something thats
spinning. Get the hall sensor close to it. Time the pulse interval. [Non-text portions of this message have been removed]



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RE: RE: off topic - motor speed (RPM) sensor - Killingsworth, Steve - Apr 22 14:59:00 2003


You could use an IR Photointerrupter such as the Sharp GP2S27T2 if your
environment supports this topology. This allows the use of light weight
reflective tape on the shaft instead of a heavy magnet to sense rotation.
This will present less of a problem with shaft balancing due to the weight
of the magnet - and should be easier to keep affixed to the shaft.

Digikey sells this part for $1.11.

Take a piece of dark (black) heat shrink or tape and affix a thin piece of
aluminum foil or reflective tape on it to act as a reflector - make sure it
does not wrap completely around the shaft. Ideally half way would ensure
50% duty cycle. -----Original Message-----
From: [mailto:]
Sent: Tuesday, April 22, 2003 3:11 PM
To:
Subject: Re: [68HC12] RE: off topic - motor speed (RPM) sensor In a message dated 4/22/03 3:09:19 PM Eastern Daylight Time,
writes:

> If you have used these before, please let me
> know if there are any issue in real world application and stuff, since
I've
> never used these types of sensors before. All of your help would be much
> appreciated. Order some magnets while you're at it. Glue the magnet to something thats
spinning. Get the hall sensor close to it. Time the pulse interval. [Non-text portions of this message have been removed]
--------------------------------------------------------
To unsubscribe from this group, send an email to: To learn more about Motorola Microcontrollers, please visit
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Re: RE: off topic - motor speed (RPM) sensor - Adrian Vos - Apr 22 18:42:00 2003

Why not use an existing motor sensor if your funds are limitted.... it is
very easy to get a good signal from the ignition system if it is not a
diesel.

-- Adrian

----- Original Message -----
From: "Vien Nguyen" <>
To: <>
Sent: Wednesday, April 23, 2003 5:07 AM
Subject: [68HC12] RE: off topic - motor speed (RPM) sensor > Hi all,
>
> First, thank you all for your great and very helpful inputs.
>
> I guest my budge for this sensor for my experiment is around $2, so I
found
> those at Honeywell (and Cherry's) too expensive for me; they range from
$11
> to over $100 (geeze ... ) . I am really happy now finding those Micronas'
> Hall effect sensors at Digikey, thanks to your direction.
>
> I am not sure which one is appropriate for my application, so I'd order
> some of the HAL502, 503, and 505 series and play w/ them for now.
> Basically, I'd attach them to a motor and monitor the RPM (just
monitoring,
> not controlling, for now). If you have used these before, please let me
> know if there are any issue in real world application and stuff, since
I've
> never used these types of sensors before. All of your help would be much
> appreciated.
>
> Again, thank you all.
>
> Regards,
>
> Vien Nguyen. > --------------------------------------------------------
> To unsubscribe from this group, send an email to: > To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu





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Re: RE: off topic - motor speed (RPM) sensor - Bob White - Apr 22 20:57:00 2003

If it burns fuel, it's an engine. A motor is a transducer.

Bob White

----- Original Message -----
From: "Adrian Vos" <>
To: <>
Sent: Tuesday, April 22, 2003 4:42 PM
Subject: Re: [68HC12] RE: off topic - motor speed (RPM) sensor Why not use an existing motor sensor if your funds are limitted.... it is
very easy to get a good signal from the ignition system if it is not a
diesel.

-- Adrian

----- Original Message -----
From: "Vien Nguyen" <>
To: <>
Sent: Wednesday, April 23, 2003 5:07 AM
Subject: [68HC12] RE: off topic - motor speed (RPM) sensor > Hi all,
>
> First, thank you all for your great and very helpful inputs.
>
> I guest my budge for this sensor for my experiment is around $2, so I
found
> those at Honeywell (and Cherry's) too expensive for me; they range from
$11
> to over $100 (geeze ... ) . I am really happy now finding those Micronas'
> Hall effect sensors at Digikey, thanks to your direction.
>
> I am not sure which one is appropriate for my application, so I'd order
> some of the HAL502, 503, and 505 series and play w/ them for now.
> Basically, I'd attach them to a motor and monitor the RPM (just
monitoring,
> not controlling, for now). If you have used these before, please let me
> know if there are any issue in real world application and stuff, since
I've
> never used these types of sensors before. All of your help would be much
> appreciated.
>
> Again, thank you all.
>
> Regards,
>
> Vien Nguyen. > --------------------------------------------------------
> To unsubscribe from this group, send an email to: > To learn more about Motorola Microcontrollers, please visit
> http://www.motorola.com/mcu --------------------------------------------------------
To unsubscribe from this group, send an email to: To learn more about Motorola Microcontrollers, please visit
http://www.motorola.com/mcu




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RE: off topic - motor speed (RPM) sensor - Vien Nguyen - Apr 23 17:41:00 2003

Hi all,

Again, thank you all for your inputs.

Since I've chosen the Micronas' HALxxx sensors, I'm going to stick w/ them
for testing unless there are major problems w/ them.

I appreciate your suggestions, but there is no ignition system here, just
like Bob White pointed out, so I can't use it Adrian.

To Bob Gardner, why would I need to buy magnets and glue them on the motor
for the sensors to pick up the pulses? I thought the magnets within the
motor would generate the magnetics field for these sensors to pick up,
wouldn't they?

Also, why would I need to time the pulse interval? I only need to determine
the RPM of the motor, not the position of the shaft. So I think keeping
track of the pulses over time would be all I need to do, right?

Best regards,

Vien Nguyen.



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Re: RE: off topic - motor speed (RPM) sensor - Author Unknown - Apr 23 19:06:00 2003

In a message dated 4/23/03 6:41:47 PM Eastern Daylight Time,
writes:

> To Bob Gardner, why would I need to buy magnets and glue them on the motor
> for the sensors to pick up the pulses? I thought the magnets within the
> motor would generate the magnetics field for these sensors to pick up,
> wouldn't they?
>
> Also, why would I need to time the pulse interval? I only need to determine
> the RPM of the motor, not the position of the shaft. So I think keeping
> track of the pulses over time would be all I need to do, right?
I use em to initialize a pointer. My experience is a very strong neodymium
magnet about 1/4" from the hall sensor trips it. If the magnet comes around
once per rev and you measure the interval between pulses, you have just about
all the data you need to compute rpm. [Non-text portions of this message have been removed]



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RE: RE: off topic - motor speed (RPM) sensor - Longworth, Kevin - May 2 14:16:00 2003


This sounds lilke my college project. I used magnets on the shaft, with some
hand wound fine transformer wire on a ferrite core, input to an op-amp at
high gain. This provided a pulse while the magnet was generating voltage, so
I timed the pulse width, not the time between pulses. Speed is inversely
proportional to the pulse width.

-----Original Message-----
From: [mailto:]
Sent: Wednesday, April 23, 2003 8:06 PM
To:
Subject: Re: [68HC12] RE: off topic - motor speed (RPM) sensor In a message dated 4/23/03 6:41:47 PM Eastern Daylight Time,
writes:

> To Bob Gardner, why would I need to buy magnets and glue them on the motor
> for the sensors to pick up the pulses? I thought the magnets within the
> motor would generate the magnetics field for these sensors to pick up,
> wouldn't they?
>
> Also, why would I need to time the pulse interval? I only need to
determine
> the RPM of the motor, not the position of the shaft. So I think keeping
> track of the pulses over time would be all I need to do, right?
I use em to initialize a pointer. My experience is a very strong neodymium
magnet about 1/4" from the hall sensor trips it. If the magnet comes around
once per rev and you measure the interval between pulses, you have just
about
all the data you need to compute rpm. [Non-text portions of this message have been removed]
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