muscle wires
I have some muscle wires, which can be made to expand and contract by running
small voltages through them to heat them up to about 70 deg C. The
transition happens pretty rapidly over a small temperature range, so it's
kind of jerky. I am thinking that if I could measure the temperature of the
wire and adjust the voltage being applied, I might be able to control how
fast the wire changes shape.
Can you get a temperature probe that can measure the temperature of a wire?
Has anyone else used stamps with muscle wires?
thanks
small voltages through them to heat them up to about 70 deg C. The
transition happens pretty rapidly over a small temperature range, so it's
kind of jerky. I am thinking that if I could measure the temperature of the
wire and adjust the voltage being applied, I might be able to control how
fast the wire changes shape.
Can you get a temperature probe that can measure the temperature of a wire?
Has anyone else used stamps with muscle wires?
thanks
Comments
attach these to the wires with epoxy and measure the resistance which
corresponds to the actual temperature of the device.
Jim
Original Message
From: eclecticrr@A... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=YGFelM4Mp8lvk382MPXfOcaeRMlL58-UtoV6RCrDeBFrisYoXCszdJaPI94TbTOLgf66BvdlLwwbiinn]eclecticrr@A...[/url
Sent: Friday, May 10, 2002 3:49 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] muscle wires
I have some muscle wires, which can be made to expand and contract by
running
small voltages through them to heat them up to about 70 deg C. The
transition happens pretty rapidly over a small temperature range, so it's
kind of jerky. I am thinking that if I could measure the temperature of the
wire and adjust the voltage being applied, I might be able to control how
fast the wire changes shape.
Can you get a temperature probe that can measure the temperature of a wire?
Has anyone else used stamps with muscle wires?
thanks
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regulator can be converted by wiring the input pin to your voltage source
about +6vdc to +15vdc, then wiring a resistor(R) in series with the output
pin and the muscle wire then wire the other side of your muscle wire to a
NPN transistor (to be switched by the stamp), then wire the adj. pin between
the resistor(R) and the muscle wire. The current out is equal to 1.25
divided by (R) where R is the resistance in ohms. Set the current according
to the wire spec. By keeping the current constant the wire will not burn up
by mistake and it will move with less jerk because as the wire heats up it
changes it's internal resistance and try's to pull more current but the
constant current device will automatically adj. the voltage to keep the
current constant. If you need a schematic of this contact me by e-mailing to
skip.webb@h... good luck with your experiment. Skip
Original Message
From: Jim Forkin [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=vjHvqRIqRuiiWQmj2lMqmNNNvPfaDOhuZKDkjiVoKbv4nU7032F8zth_VfKUvl42AslZSvs]jjf@p...[/url
Sent: Friday, May 10, 2002 7:21 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] muscle wires
You can buy a device called a thermocouple from places like digi-key. Just
attach these to the wires with epoxy and measure the resistance which
corresponds to the actual temperature of the device.
Jim
Original Message
From: eclecticrr@A... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=pIxneSciVHAIPwuqZkTWgueq_yCIJMV6ItyJCao1IEnCd0rxmxTy8JWgKXzIzwBdqlPKfRqvXwHI]eclecticrr@A...[/url
Sent: Friday, May 10, 2002 3:49 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] muscle wires
I have some muscle wires, which can be made to expand and contract by
running
small voltages through them to heat them up to about 70 deg C. The
transition happens pretty rapidly over a small temperature range, so it's
kind of jerky. I am thinking that if I could measure the temperature of the
wire and adjust the voltage being applied, I might be able to control how
fast the wire changes shape.
Can you get a temperature probe that can measure the temperature of a wire?
Has anyone else used stamps with muscle wires?
thanks
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
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To UNSUBSCRIBE, just send mail to:
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Don
Original Message
From: "Webb, Skip (FL51)" <skip.webb@h...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, May 10, 2002 5:35 AM
Subject: RE: [noparse][[/noparse]basicstamps] muscle wires
> Are you using a constant current device? If not, you should. A 317t
voltage
> regulator can be converted by wiring the input pin to your voltage source
> about +6vdc to +15vdc, then wiring a resistor(R) in series with the output
> pin and the muscle wire then wire the other side of your muscle wire to a
> NPN transistor (to be switched by the stamp), then wire the adj. pin
between
> the resistor(R) and the muscle wire. The current out is equal to 1.25
> divided by (R) where R is the resistance in ohms. Set the current
according
> to the wire spec. By keeping the current constant the wire will not burn
up
> by mistake and it will move with less jerk because as the wire heats up it
> changes it's internal resistance and try's to pull more current but the
> constant current device will automatically adj. the voltage to keep the
> current constant. If you need a schematic of this contact me by e-mailing
to
> skip.webb@h... good luck with your experiment. Skip
>
>
Original Message
> From: Jim Forkin [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=-HEKVgqgSXiIGJEA-xfdidn97Je4nOCz7uYu80EVUajf1TjdwBAVbUL-lmLcxiwPDX1aFw1m]jjf@p...[/url
> Sent: Friday, May 10, 2002 7:21 AM
> To: basicstamps@yahoogroups.com
> Subject: RE: [noparse][[/noparse]basicstamps] muscle wires
>
>
> You can buy a device called a thermocouple from places like digi-key.
Just
> attach these to the wires with epoxy and measure the resistance which
> corresponds to the actual temperature of the device.
>
> Jim
>
>
Original Message
> From: eclecticrr@A... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=C5GdqQhbmuK0-lfcQL2ssDgxKJQ0nJMTibkOF8JjUOBe2VmNxt8KISxlm1_cL7azUJLwD3cTb5SB1lQ]eclecticrr@A...[/url
> Sent: Friday, May 10, 2002 3:49 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] muscle wires
>
>
> I have some muscle wires, which can be made to expand and contract by
> running
> small voltages through them to heat them up to about 70 deg C. The
> transition happens pretty rapidly over a small temperature range, so it's
> kind of jerky. I am thinking that if I could measure the temperature of
the
> wire and adjust the voltage being applied, I might be able to control how
> fast the wire changes shape.
>
> Can you get a temperature probe that can measure the temperature of a
wire?
>
> Has anyone else used stamps with muscle wires?
>
> thanks
>
> 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/
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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>
> To UNSUBSCRIBE, just send mail to:
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>
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>
>
>
Original Message
From: Don [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Jmg_9rwbyG_vYM3yGaktCnFxEU-nen80RgYyTdH7jhWnuad2qVmXNknuBxh6a3RrIa9Y5HxOASLoZsHWOJYX2_fXOOCc]renegade.engineer@v...[/url
Sent: Friday, May 10, 2002 12:30 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] muscle wires
Thanks Skip! Nicely drawn schematic!
Don
Original Message
From: "Webb, Skip (FL51)" <skip.webb@h...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, May 10, 2002 5:35 AM
Subject: RE: [noparse][[/noparse]basicstamps] muscle wires
> Are you using a constant current device? If not, you should. A 317t
voltage
> regulator can be converted by wiring the input pin to your voltage source
> about +6vdc to +15vdc, then wiring a resistor(R) in series with the output
> pin and the muscle wire then wire the other side of your muscle wire to a
> NPN transistor (to be switched by the stamp), then wire the adj. pin
between
> the resistor(R) and the muscle wire. The current out is equal to 1.25
> divided by (R) where R is the resistance in ohms. Set the current
according
> to the wire spec. By keeping the current constant the wire will not burn
up
> by mistake and it will move with less jerk because as the wire heats up it
> changes it's internal resistance and try's to pull more current but the
> constant current device will automatically adj. the voltage to keep the
> current constant. If you need a schematic of this contact me by e-mailing
to
> skip.webb@h... good luck with your experiment. Skip
>
>
Original Message
> From: Jim Forkin [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Mlo-x5WfqBwYKkYyAdWpEu1nIE3lkmr7VOFsnOx1P5rtupyRS3VA-tmMDBWiZjGT36kzVWjwfSE5HA]jjf@p...[/url
> Sent: Friday, May 10, 2002 7:21 AM
> To: basicstamps@yahoogroups.com
> Subject: RE: [noparse][[/noparse]basicstamps] muscle wires
>
>
> You can buy a device called a thermocouple from places like digi-key.
Just
> attach these to the wires with epoxy and measure the resistance which
> corresponds to the actual temperature of the device.
>
> Jim
>
>
Original Message
> From: eclecticrr@A... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=H7aeoMBuODc68o14A63-UZmEM4vW7tCfE8t4Zoq7NIsZSs6WP-8A7_qptR9ZoJ9VNHeLRZgWU5w]eclecticrr@A...[/url
> Sent: Friday, May 10, 2002 3:49 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] muscle wires
>
>
> I have some muscle wires, which can be made to expand and contract by
> running
> small voltages through them to heat them up to about 70 deg C. The
> transition happens pretty rapidly over a small temperature range, so it's
> kind of jerky. I am thinking that if I could measure the temperature of
the
> wire and adjust the voltage being applied, I might be able to control how
> fast the wire changes shape.
>
> Can you get a temperature probe that can measure the temperature of a
wire?
>
> Has anyone else used stamps with muscle wires?
>
> thanks
>
> 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/
>
>
>
> 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/
>
> To UNSUBSCRIBE, just send mail to:
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>
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>
>
>
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sensor" category and they appear to cost about $95 each. That's more than I
want to pay unless I'm readying something wrong. Do you have any less
expensive suggestions?
thanks
In a message dated 05/10/2002 4:34:17 AM Pacific Daylight Time,
jjf@p... writes:
<< You can buy a device called a thermocouple from places like digi-key. Just
attach these to the wires with epoxy and measure the resistance which
corresponds to the actual temperature of the device.
Jim >>