solenoid control ???
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Posts: 46,084
I am going to try to set up a stamp to read rpm from a motor and be
able to activate 1 of 2 soleniods depending on rpm. The solenoids are
12vdc 11 watts with a 13ohm coil. Would I need to use a relay for
this or a transistor? I'm still in the learning curve and am not sure
which method is the most fool proof and rugged. Any help would be
appreciated and thanks in advance.
James
able to activate 1 of 2 soleniods depending on rpm. The solenoids are
12vdc 11 watts with a 13ohm coil. Would I need to use a relay for
this or a transistor? I'm still in the learning curve and am not sure
which method is the most fool proof and rugged. Any help would be
appreciated and thanks in advance.
James
Comments
--- In basicstamps@yahoogroups.com, "pstarckt" <pstarckt@y...> wrote:
> I am going to try to set up a stamp to read rpm from a motor and be
> able to activate 1 of 2 soleniods depending on rpm. The solenoids
are
> 12vdc 11 watts with a 13ohm coil. Would I need to use a relay for
> this or a transistor? I'm still in the learning curve and am not
sure
> which method is the most fool proof and rugged. Any help would be
> appreciated and thanks in advance.
>
> James
Original Message
From: "pstarckt" <pstarckt@y...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, February 21, 2004 11:33 PM
Subject: [noparse][[/noparse]basicstamps] Re: solenoid control ???
> Any help at all??
>
> --- In basicstamps@yahoogroups.com, "pstarckt" <pstarckt@y...> wrote:
> > I am going to try to set up a stamp to read rpm from a motor and be
> > able to activate 1 of 2 soleniods depending on rpm. The solenoids
> are
> > 12vdc 11 watts with a 13ohm coil. Would I need to use a relay for
> > this or a transistor? I'm still in the learning curve and am not
> sure
> > which method is the most fool proof and rugged. Any help would be
> > appreciated and thanks in advance.
> >
> > James
>
>
>
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>
A relay will work, but I am going to assume you want the solenoid to activate
as soon as possible once the target rpm is seen.
Get a logic level mosfet, like an IRL520. www.glitchbuster.com
This setup I am about to explain will provide a ground for the solenoid to
operate.
Connect the solenoid positive wire to +12 volts
Connect the solenoid negative wire to the IRL520 drain terminal
Connect the IRL520 source terminal to system ground
Connect the IRL520 gate terminal to the stamp output terminal.
Connect a 1 meg ohm resistor from the IRL520 gate terminal to system ground
When you make the stamp output pin high, the solenoid should turn on.
The IRL520 will easily handle the current of your solenoid. This is only of
many methods to achieve your desired result. This solution is overkill but a
"no brainer"
ken
Any help at all??
--- In basicstamps@yahoogroups.com, "pstarckt" <pstarckt@y...> wrote:
> I am going to try to set up a stamp to read rpm from a motor and be
> able to activate 1 of 2 soleniods depending on rpm. The solenoids
are
> 12vdc 11 watts with a 13ohm coil. Would I need to use a relay for
> this or a transistor? I'm still in the learning curve and am not
sure
> which method is the most fool proof and rugged. Any help would be
> appreciated and thanks in advance.
>
> James
[noparse][[/noparse]Non-text portions of this message have been removed]
--- In basicstamps@yahoogroups.com, "fiveslo" <fiveslo@s...> wrote:
> Is this by any chance for nitrous???
>
>
>
Original Message
> From: "pstarckt" <pstarckt@y...>
> To: <basicstamps@yahoogroups.com>
> Sent: Saturday, February 21, 2004 11:33 PM
> Subject: [noparse][[/noparse]basicstamps] Re: solenoid control ???
>
>
> > Any help at all??
> >
> > --- In basicstamps@yahoogroups.com, "pstarckt" <pstarckt@y...>
wrote:
> > > I am going to try to set up a stamp to read rpm from a motor
and be
> > > able to activate 1 of 2 soleniods depending on rpm. The
solenoids
> > are
> > > 12vdc 11 watts with a 13ohm coil. Would I need to use a relay
for
> > > this or a transistor? I'm still in the learning curve and am not
> > sure
> > > which method is the most fool proof and rugged. Any help would
be
> > > appreciated and thanks in advance.
> > >
> > > James
> >
> >
> >
> > 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.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> Nope. It's for a small scale transmission in an RC model.
>
I'll second the suggestion for an IRL540. *VERY* stamp friendly. If
space is a concern, the IRL540N has no mounting lug. The data sheet is
surprisingly void of specifics, such as the use of pull-downs, so I've
never used one. Though it may be a good design practice, if you have a
space problem, you can eliminate the pulldown without worry.
Stephen Weller
American. Veteran. Patriot.
--- In basicstamps@yahoogroups.com, "wun_fungi" <sweller@a...> wrote:
> --- In basicstamps@yahoogroups.com, "pstarckt" <pstarckt@y...>
wrote:
> > Nope. It's for a small scale transmission in an RC model.
> >
>
>
> I'll second the suggestion for an IRL540. *VERY* stamp friendly. If
> space is a concern, the IRL540N has no mounting lug. The data sheet
is
> surprisingly void of specifics, such as the use of pull-downs, so
I've
> never used one. Though it may be a good design practice, if you
have a
> space problem, you can eliminate the pulldown without worry.
>
> Stephen Weller
> American. Veteran. Patriot.
Just a side note.
The IRL520N will handle 10 amps
IRL530N 17 amps
IRL540N 36 amps
The 10 amp variety will suffice.
www.glitchbuster.com has good prices and the best shipping prices in the US.
Thanks! Space is not a problem. Can I get these at Radio Shack?
[noparse][[/noparse]Non-text portions of this message have been removed]
> Thanks! Space is not a problem. Can I get these at Radio Shack?
>
I don't believe so. I get them (by the gross. :-) from Digi-Key.
Stephen Weller
American. Veteran.Patriot.
IRL and the IFR mosfet? Also in a previous post it was recommended to
have a 1 meg resisitor in place between the gate and system ground.
How is the size of this resistor determined? I've got the formulas
here but I guess I'm having trouble telling the forest for the trees.
In the 'homework' book they use the 470 ohm resistor alot with the
led but that seems to be as a voltage reducer. In this case wouldn't
putting a 1 meg in line with the ground also reduce the voltage from
the 12vdc batt to the 12 vdc solenoid?
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> Unlikely Radio Shack will have these......
> Just a side note.
>
> The IRL520N will handle 10 amps
> IRL530N 17 amps
> IRL540N 36 amps
>
> The 10 amp variety will suffice.
>
> www.glitchbuster.com has good prices and the best shipping prices
in the US.
>
>
> Thanks! Space is not a problem. Can I get these at Radio Shack?
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
long as your soleniod consumes 1 amp or less.
I am no expert on MOSFETS, but I believe the gate resistor to ground serves
two purposes:
1. To prevent "ringing" at turn on (makes a "cleaner" turn on signal for your
load)
2. For the device to turn off when power to the gate is removed. The gate
needs a path to get rid of the charge that is there when it is turned on. This
probably does not apply in your case.
The 470 ohm resistor you see with LEDs is to LIMIT the current that goes
through the LED. An LED will have a certain voltage across it, typical 2 volts
lets say. What ever voltage is left over (12 volt system, then 10 volts left
over) using ohms law you calculte the resistor value for the current you want
through the LED.
If you want 10 mA through the LED, and 12 volts is the power
source........12-2 = 10
10v/10mA = 1k ohms
or using a 5 volt system and assuming a "2 volt" led, again using ohms law, 3
volts / 470 ohms gives 6.3 mA.
ken
http://www.ee.nmt.edu/~wedeward/EE443L/FA99/IRF510.pdf
I found a IFR510 at Radio Shack. What is the difference between the
IRL and the IFR mosfet? Also in a previous post it was recommended to
have a 1 meg resisitor in place between the gate and system ground.
How is the size of this resistor determined? I've got the formulas
here but I guess I'm having trouble telling the forest for the trees.
In the 'homework' book they use the 470 ohm resistor alot with the
led but that seems to be as a voltage reducer. In this case wouldn't
putting a 1 meg in line with the ground also reduce the voltage from
the 12vdc batt to the 12 vdc solenoid?
[noparse][[/noparse]Non-text portions of this message have been removed]
>
> I found a IFR510 at Radio Shack. What is the difference between the
> IRL and the IFR mosfet? Also in a previous post it was recommended to
> have a 1 meg resisitor in place between the gate and system ground.
> How is the size of this resistor determined? I've got the formulas
> here but I guess I'm having trouble telling the forest for the trees.
> In the 'homework' book they use the 470 ohm resistor alot with the
> led but that seems to be as a voltage reducer. In this case wouldn't
> putting a 1 meg in line with the ground also reduce the voltage from
> the 12vdc batt to the 12 vdc solenoid?
The 1M resistor keeps the FET turned off except when driven -
Otherwise Murphys Law decrees that the gate will float into
the linear region of the FET, where it will dissipate lots of
power & generally be a pain.
regards, Jack
operation. I would hesitate to use relays if they are required Io operate
hundreds of times / hour I would use transistors. The harder you use a relay,or
any mechanical device the more likely it is to fail.
pstarckt <pstarckt@y...> wrote:I am going to try to set up a stamp to read
rpm from a motor and be
able to activate 1 of 2 soleniods depending on rpm. The solenoids are
12vdc 11 watts with a 13ohm coil. Would I need to use a relay for
this or a transistor? I'm still in the learning curve and am not sure
which method is the most fool proof and rugged. Any help would be
appreciated and thanks in advance.
James
To UNSUBSCRIBE, just send mail to:
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[noparse][[/noparse]Non-text portions of this message have been removed]
Do you need help with the rpm reading, or solenoid activation, or both?
For the solenoid activation, go to www.glitchbuster.com and get yourself a
handfull of MOSFETS......IRL520
These guys are simply the EASIEST to interface to your stamp.
Connect the stamp output pin to the Gate
Connect a 1 meg ohm resistor from the Gate to ground
Connect the Source to Ground
Connect the Drain to the minus side of your solenoid that will have positive
12 volts connected to the other side.
When you want the solenoid to turn on, make the stamp output pin logic high,
this will cause the MOSFET to act like a switch to ground if wired as
described above.
I am not affiliated with glitchbuster.com in any way, I am simply a satisfied
customer. His prices are very good and you cannot beat his shipping costs.
Ken
========================
pstarckt <pstarckt@y...> wrote:I am going to try to set up a stamp to
read rpm from a motor and be
able to activate 1 of 2 soleniods depending on rpm. The solenoids are
12vdc 11 watts with a 13ohm coil. Would I need to use a relay for
this or a transistor? I'm still in the learning curve and am not sure
which method is the most fool proof and rugged. Any help would be
appreciated and thanks in advance.
James
[noparse][[/noparse]Non-text portions of this message have been removed]
difference reliability wise. My experience with solenoids over the last 20
years has been that they're good for roughly two years (about 50 operations
a day) before you have to rebuild them. The relays we use to drive them
almost never fail.
What I'd be considering is the delay in operating the solenoids. Already, a
solenoid is dead slow compared to silicon. Add a relay which is also very
slow and you have a significant delay between the signal being sent and the
solenoid reaching full open.
For instance - The JS1E-5V relays I have here take approximately 10ms to
operate. If the solenoid is similar, thats 20ms delay between signal and
full operation. Changing to a transistor will cut that time virtually in
half. Turn on time for a transistor like the 2907 is something like 50ns
In silicon terms, 20ms is a long time - only you know if thats fast or slow
for your application.
11 watts / 12 volts = .92 amps (VA=W). You should get a relay or transistor
that can handle at least twice the required current - so 2 amps at least.
You also want to check into contact material if you go with relays. Contacts
are NOT all created equal by any means. Some are made for high voltage,
others for high current, others for frequent operation, etc.
Other considerations when deciding between the two. A relay will require a
reverse voltage protection diode (turn off coil power and you get a BIG
reverse voltage spike). Relays are also power hungry to operate. The
aformentioned JS1E-5V has a nominal hold current of about 80mA and a good
deal more than that to turn on (short duration inrush current). You couldn't
just operate it off a stamp pin, you'd have to use an optocoupler or
transistor to switch its power on and off.
One complicating factor is turn on voltage. You're switching 12 volts but
your control circuit is 5 volts. The lower the voltage you use to operate a
relay, the higher the current required is. The JS1E-5V requires 80mA, the
JS1E-12V requires 33mA. Whichever route you go, the stamp isn't going to be
able to operate it directly. You'll need a transistor and/or optocoupler to
operate the relay.
The big deciding factor in the choice between transistor and relay is one of
isolation. If the circuit you're switching suddenly has a gargantuan voltage
spike, a relay will have a MUCH greater chance of not only surviving the
spike but also of protecting your control circuit. The JS1E relay can
protect your circuit against spikes up to 1500 volts.
The 2907 transistor only goes to about 60v but you can (should) use an
optocoupler between the stamp and the transistor. Optocouplers can typicaly
protect your circuit up to several thousands of volts (though they
themselves are slag).
All things considered, my own choice would be an optocoupler/transistor pair
to switch the solenoid on and off. Using a relay you just add one more
component that can fail and cause a greater delay from signal to action.
There are even optocouplers out there that could switch this solenoid
directly without the need for a transistor at all.
N.B. The PN2907 transistor is not suitable for your task - it just happens
to be the one I have a datasheet handy for.
>
Original Message
> From: PHILIP GAMBLIN [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=KH3tIpkZu-WDXDsNAux9bNfKBvTFOAVqnJt9qkaePshzCN2d__zzumwmn8cDt08qRYSzVycqPp_qegkJRw]gremlin8650@y...[/url
> Sent: March 28, 2004 6:32 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] solenoid control ???
>
>
> Aside from space considerations and economics, I would look at
> the frequency of operation. I would hesitate to use relays if
> they are required Io operate hundreds of times / hour I would use
> transistors. The harder you use a relay,or any mechanical device
> the more likely it is to fail.
>
> pstarckt <pstarckt@y...> wrote:I am going to try to set up a
> stamp to read rpm from a motor and be
> able to activate 1 of 2 soleniods depending on rpm. The solenoids are
> 12vdc 11 watts with a 13ohm coil. Would I need to use a relay for
> this or a transistor? I'm still in the learning curve and am not sure
> which method is the most fool proof and rugged. Any help would be
> appreciated and thanks in advance.
>
> James
>
>
>
> 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.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
> Do you Yahoo!?
> Yahoo! Finance Tax Center - File online. File on time.
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>
> To UNSUBSCRIBE, just send mail to:
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> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
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>
>
>
>
> to be the one I have a datasheet handy for.
>
http://www.fairchildsemi.com/ds/PN/PN2907.pdf
to a BS2P24? I would like to measure pressures in the range
~0 to 20psi.
TIA,
Tom Fisher
Dallas,TX
a junk yard. The sensor will bolt directly to the intake manifold and have
three terminals, typically +5v, ground and output.
ken
Where can I get a small air pressure sensor to easily interface
to a BS2P24? I would like to measure pressures in the range
~0 to 20psi.
[noparse][[/noparse]Non-text portions of this message have been removed]
> to a BS2P24? I would like to measure pressures in the range
> ~0 to 20psi.
Found it:
http://e-www.motorola.com/webapp/sps/site/prod_summary.jsp?code=MPX4115&nodeId=0\
1126990368716#documentation
Thanks for the ideas.
Tom Fisher
BigD
Digi has more choices, though.
Mike
--- In basicstamps@yahoogroups.com, "tboonefisher"
<tboonefisher@s...> wrote:
> Where can I get a small air pressure sensor to easily interface
> to a BS2P24? I would like to measure pressures in the range
> ~0 to 20psi.
> TIA,
> Tom Fisher
> Dallas,TX
> Digi has more choices, though.
>
Thanks. I just ordered one.
Tom Fisher
BigD