Controlling outside load
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Posts: 46,084
Hi, I'm sort of a newbie at Basic Stamps, I got mine a few years ago
and never did anything with it.
I'm using a Basic Stamp II to build a small engine controller. What
is a common way to control outside loads, such as a fuel injector
which runs on 12V DC? I also need to be able to pulse 12V DC through
a step up coil to make a spark across a spark plug. Currently I'm
planning to use small solid state relays, and pulse them on and off.
I would use a separate 12 volt supply, and simply use the stamp to
switch them.
Is there a better, more civilized way to do this? Would some sort of
digital "driver" be better? I'm not sure how these "drivers" work.
Also, I need a way to detect crankshaft position exactly. I was
thinking of small relay coils mounted beside the shaft, with a small
magnet stuck to the shaft, so when it passes, it induces current in
the coil and tells the stamp to trigger the spark or injection at
the right time.
I am sure there is a better way to do this as well...
I would appreciate any advice I can get on this,
Thanks
Bill
and never did anything with it.
I'm using a Basic Stamp II to build a small engine controller. What
is a common way to control outside loads, such as a fuel injector
which runs on 12V DC? I also need to be able to pulse 12V DC through
a step up coil to make a spark across a spark plug. Currently I'm
planning to use small solid state relays, and pulse them on and off.
I would use a separate 12 volt supply, and simply use the stamp to
switch them.
Is there a better, more civilized way to do this? Would some sort of
digital "driver" be better? I'm not sure how these "drivers" work.
Also, I need a way to detect crankshaft position exactly. I was
thinking of small relay coils mounted beside the shaft, with a small
magnet stuck to the shaft, so when it passes, it induces current in
the coil and tells the stamp to trigger the spark or injection at
the right time.
I am sure there is a better way to do this as well...
I would appreciate any advice I can get on this,
Thanks
Bill
Comments
SSR are pretty expensive, and you could use a much less expensive transistor
or mofset or something along those lines.
To detect crank shaft position, how about a tiny NIB magnet and a Hall
sensor.
Jonathan
www.madlabs.info
Original Message
From: <billak@f...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, January 22, 2003 7:34 AM
Subject: [noparse][[/noparse]basicstamps] Controlling outside load
> Hi, I'm sort of a newbie at Basic Stamps, I got mine a few years ago
> and never did anything with it.
>
> I'm using a Basic Stamp II to build a small engine controller. What
> is a common way to control outside loads, such as a fuel injector
> which runs on 12V DC? I also need to be able to pulse 12V DC through
> a step up coil to make a spark across a spark plug. Currently I'm
> planning to use small solid state relays, and pulse them on and off.
> I would use a separate 12 volt supply, and simply use the stamp to
> switch them.
>
> Is there a better, more civilized way to do this? Would some sort of
> digital "driver" be better? I'm not sure how these "drivers" work.
>
> Also, I need a way to detect crankshaft position exactly. I was
> thinking of small relay coils mounted beside the shaft, with a small
> magnet stuck to the shaft, so when it passes, it induces current in
> the coil and tells the stamp to trigger the spark or injection at
> the right time.
> I am sure there is a better way to do this as well...
>
> I would appreciate any advice I can get on this,
>
> Thanks
>
> Bill
>
>
>
>
> 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/
>
>
>
>
the company that makes them.
Would a MOSFET or transistor react faster? I think the reaction time
on these relays is like 1 ms.
About the Hall sensor, now that I think about it, I think Chrysler
used them to tell when their 2.2 and 2.5 liter "K" car type and
minivan engines were turning. They put it in the distributor I think.
Where do you guys buy your electronic components like this? Radio
Shack doesn't have Smile anymore.
Thanks,
Bill
--- In basicstamps@yahoogroups.com, "Jonathan Peakall"
<jpeakall@m...> wrote:
> Bill,
>
> SSR are pretty expensive, and you could use a much less expensive
transistor
> or mofset or something along those lines.
>
> To detect crank shaft position, how about a tiny NIB magnet and a
Hall
> sensor.
>
> Jonathan
>
> www.madlabs.info
>
>
Original Message
> From: <billak@f...>
> To: <basicstamps@yahoogroups.com>
> Sent: Wednesday, January 22, 2003 7:34 AM
> Subject: [noparse][[/noparse]basicstamps] Controlling outside load
>
>
> > Hi, I'm sort of a newbie at Basic Stamps, I got mine a few years
ago
> > and never did anything with it.
> >
> > I'm using a Basic Stamp II to build a small engine controller.
What
> > is a common way to control outside loads, such as a fuel injector
> > which runs on 12V DC? I also need to be able to pulse 12V DC
through
> > a step up coil to make a spark across a spark plug. Currently I'm
> > planning to use small solid state relays, and pulse them on and
off.
> > I would use a separate 12 volt supply, and simply use the stamp
to
> > switch them.
> >
> > Is there a better, more civilized way to do this? Would some
sort of
> > digital "driver" be better? I'm not sure how these "drivers"
work.
> >
> > Also, I need a way to detect crankshaft position exactly. I was
> > thinking of small relay coils mounted beside the shaft, with a
small
> > magnet stuck to the shaft, so when it passes, it induces current
in
> > the coil and tells the stamp to trigger the spark or injection at
> > the right time.
> > I am sure there is a better way to do this as well...
> >
> > I would appreciate any advice I can get on this,
> >
> > Thanks
> >
> > Bill
> >
> >
> >
> >
> > 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/
> >
> >
> >
> >
billak@f... writes:
> Hi, I'm sort of a newbie at Basic Stamps, I got mine a few years ago
> and never did anything with it.
>
> I'm using a Basic Stamp II to build a small engine controller. What
> is a common way to control outside loads, such as a fuel injector
> which runs on 12V DC? I also need to be able to pulse 12V DC through
> a step up coil to make a spark across a spark plug. Currently I'm
> planning to use small solid state relays, and pulse them on and off.
> I would use a separate 12 volt supply, and simply use the stamp to
> switch them.
>
> Is there a better, more civilized way to do this? Would some sort of
> digital "driver" be better? I'm not sure how these "drivers" work.
>
> Also, I need a way to detect crankshaft position exactly. I was
> thinking of small relay coils mounted beside the shaft, with a small
> magnet stuck to the shaft, so when it passes, it induces current in
> the coil and tells the stamp to trigger the spark or injection at
> the right time.
> I am sure there is a better way to do this as well...
>
> I would appreciate any advice I can get on this,
>
> Thanks
How many cylinders?....With the correct interface hardware (will get to that
later) the stamp can drive your loads, injectors, read your inputs (CKP
sensor) etc.
However, the BS2 may not be "fast" enough to run the engine, especially at
higher RPM.
Also, the stamp basically can do only one thing at a time. What I mean is it
will be a challenge to continuously read the CKP sensor, cylinder #1 sensor,
then perform "interrupts" to pulse the ignition coil, injectors and any other
solenoids etc.
The BS2 SX will probably be fast enough but you will still have the challenge
of the Stamp doing one thing at a time.
If you still want to pursue your project, write back. The hardware interface
to convert CKP into TTL (a signal the stamp can interpret), and the hardware
to interface your injectors, and ignition coil to the stamp is not too
difficult.......
Ken
[noparse][[/noparse]Non-text portions of this message have been removed]
billak@f... writes:
> Where do you guys buy your electronic components like this? Radio
> Shack doesn't have Smile anymore.
>
> Thanks,
>
> Bill
>
<A HREF="www.digikey.com">www.digikey.com</A>
<A HREF="www.allied.com">www.allied.com</A>
<A HREF="www.mouser.com">www.mouser.com</A>
[noparse][[/noparse]Non-text portions of this message have been removed]
I figured since I'm only concerned with one cylinder, I should be
able to pull it off, as long as my external components react fast
enough. I have managed to make a spark happen, and signal my
injector, but because the SSR i was using had a 35 ohm drop on the
12 volts to the coil and injector it was a very weak spark and the
injector hardly just clicked. I have a set of free SSRs on the way
with 0.7-1 ohm resistance.
What do you have in mind for interfacing it? Have you done something
like this before? I have been thinking about it for a while and I
think it is possible enough to pursue. I will obviously need two
crankshaft position sensors, one to signal ignition time and one to
signal injection time. They will be at maximum advance, and the
stamp will have to be timing it.
Thanks,
Bill
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> In a message dated 1/22/2003 7:36:39 AM Pacific Standard Time,
> billak@f... writes:
>
> > Hi, I'm sort of a newbie at Basic Stamps, I got mine a few years
ago
> > and never did anything with it.
> >
> > I'm using a Basic Stamp II to build a small engine controller.
What
> > is a common way to control outside loads, such as a fuel
injector
> > which runs on 12V DC? I also need to be able to pulse 12V DC
through
> > a step up coil to make a spark across a spark plug. Currently
I'm
> > planning to use small solid state relays, and pulse them on and
off.
> > I would use a separate 12 volt supply, and simply use the stamp
to
> > switch them.
> >
> > Is there a better, more civilized way to do this? Would some
sort of
> > digital "driver" be better? I'm not sure how these "drivers"
work.
> >
> > Also, I need a way to detect crankshaft position exactly. I was
> > thinking of small relay coils mounted beside the shaft, with a
small
> > magnet stuck to the shaft, so when it passes, it induces current
in
> > the coil and tells the stamp to trigger the spark or injection
at
> > the right time.
> > I am sure there is a better way to do this as well...
> >
> > I would appreciate any advice I can get on this,
> >
> > Thanks
>
> How many cylinders?....With the correct interface hardware (will
get to that
> later) the stamp can drive your loads, injectors, read your inputs
(CKP
> sensor) etc.
>
> However, the BS2 may not be "fast" enough to run the engine,
especially at
> higher RPM.
> Also, the stamp basically can do only one thing at a time. What I
mean is it
> will be a challenge to continuously read the CKP sensor, cylinder
#1 sensor,
> then perform "interrupts" to pulse the ignition coil, injectors
and any other
> solenoids etc.
>
> The BS2 SX will probably be fast enough but you will still have
the challenge
> of the Stamp doing one thing at a time.
>
> If you still want to pursue your project, write back. The hardware
interface
> to convert CKP into TTL (a signal the stamp can interpret), and
the hardware
> to interface your injectors, and ignition coil to the stamp is not
too
> difficult.......
>
> Ken
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
Give us some deatails on the motor, operating RPM range and so on.
Jonathan
Original Message
From: <billak@f...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, January 22, 2003 8:34 AM
Subject: [noparse][[/noparse]basicstamps] Re: Controlling outside load
> Well it's only a one cylinder engine. I thought about the speed, but
> I figured since I'm only concerned with one cylinder, I should be
> able to pull it off, as long as my external components react fast
> enough. I have managed to make a spark happen, and signal my
> injector, but because the SSR i was using had a 35 ohm drop on the
> 12 volts to the coil and injector it was a very weak spark and the
> injector hardly just clicked. I have a set of free SSRs on the way
> with 0.7-1 ohm resistance.
>
> What do you have in mind for interfacing it? Have you done something
> like this before? I have been thinking about it for a while and I
> think it is possible enough to pursue. I will obviously need two
> crankshaft position sensors, one to signal ignition time and one to
> signal injection time. They will be at maximum advance, and the
> stamp will have to be timing it.
>
>
> Thanks,
>
> Bill
>
>
>
>
>
> --- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> > In a message dated 1/22/2003 7:36:39 AM Pacific Standard Time,
> > billak@f... writes:
> >
> > > Hi, I'm sort of a newbie at Basic Stamps, I got mine a few years
> ago
> > > and never did anything with it.
> > >
> > > I'm using a Basic Stamp II to build a small engine controller.
> What
> > > is a common way to control outside loads, such as a fuel
> injector
> > > which runs on 12V DC? I also need to be able to pulse 12V DC
> through
> > > a step up coil to make a spark across a spark plug. Currently
> I'm
> > > planning to use small solid state relays, and pulse them on and
> off.
> > > I would use a separate 12 volt supply, and simply use the stamp
> to
> > > switch them.
> > >
> > > Is there a better, more civilized way to do this? Would some
> sort of
> > > digital "driver" be better? I'm not sure how these "drivers"
> work.
> > >
> > > Also, I need a way to detect crankshaft position exactly. I was
> > > thinking of small relay coils mounted beside the shaft, with a
> small
> > > magnet stuck to the shaft, so when it passes, it induces current
> in
> > > the coil and tells the stamp to trigger the spark or injection
> at
> > > the right time.
> > > I am sure there is a better way to do this as well...
> > >
> > > I would appreciate any advice I can get on this,
> > >
> > > Thanks
> >
> > How many cylinders?....With the correct interface hardware (will
> get to that
> > later) the stamp can drive your loads, injectors, read your inputs
> (CKP
> > sensor) etc.
> >
> > However, the BS2 may not be "fast" enough to run the engine,
> especially at
> > higher RPM.
> > Also, the stamp basically can do only one thing at a time. What I
> mean is it
> > will be a challenge to continuously read the CKP sensor, cylinder
> #1 sensor,
> > then perform "interrupts" to pulse the ignition coil, injectors
> and any other
> > solenoids etc.
> >
> > The BS2 SX will probably be fast enough but you will still have
> the challenge
> > of the Stamp doing one thing at a time.
> >
> > If you still want to pursue your project, write back. The hardware
> interface
> > to convert CKP into TTL (a signal the stamp can interpret), and
> the hardware
> > to interface your injectors, and ignition coil to the stamp is not
> too
> > difficult.......
> >
> > Ken
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> 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/
>
>
>
>
stock is 3600 RPM. If you run it faster than this stock it will most
certainly throw the connecting rod through the side of the block.
One I get this running, if possible I would like to make it turn
faster. (This can be accomplished safely by installing a high
strength racing connecting rod). But for now I'd like to have it
able to turn 3600 RPM. Idle is from 1000-1500 usually. Common
clutches engage at 2000 RPM.
The reason I think it should be feasable is bacause since it is only
one cylinder, nothing will have to be happening simultaneous,
everything will be sequential. So if my stamp and my hardware
interfaces can react fast enough it will work.
Also, like most cars today it will not be a problem that injection
and ignition will also occur on the opposite stroke that it needs
to. In electronically controlled automobiles, this is known
as "waste spark" and "waste injection". For example, ignition can
occur on both combustion and exhaust stroke. The fuel is not really
wasted though, it carries over into the next compression and
combustion cycle. Many four cylinder cars pair up spark plugs and
injectors for this reason, even though only one cylinder fires at a
time.
Bill
--- In basicstamps@yahoogroups.com, "Jonathan Peakall"
<jpeakall@m...> wrote:
> Bill,
>
> Give us some deatails on the motor, operating RPM range and so on.
>
> Jonathan
>
>
Original Message
> From: <billak@f...>
> To: <basicstamps@yahoogroups.com>
> Sent: Wednesday, January 22, 2003 8:34 AM
> Subject: [noparse][[/noparse]basicstamps] Re: Controlling outside load
>
>
> > Well it's only a one cylinder engine. I thought about the speed,
but
> > I figured since I'm only concerned with one cylinder, I should be
> > able to pull it off, as long as my external components react fast
> > enough. I have managed to make a spark happen, and signal my
> > injector, but because the SSR i was using had a 35 ohm drop on
the
> > 12 volts to the coil and injector it was a very weak spark and
the
> > injector hardly just clicked. I have a set of free SSRs on the
way
> > with 0.7-1 ohm resistance.
> >
> > What do you have in mind for interfacing it? Have you done
something
> > like this before? I have been thinking about it for a while and I
> > think it is possible enough to pursue. I will obviously need two
> > crankshaft position sensors, one to signal ignition time and one
to
> > signal injection time. They will be at maximum advance, and the
> > stamp will have to be timing it.
> >
> >
> > Thanks,
> >
> > Bill
> >
> >
> >
> >
> >
> > --- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> > > In a message dated 1/22/2003 7:36:39 AM Pacific Standard Time,
> > > billak@f... writes:
> > >
> > > > Hi, I'm sort of a newbie at Basic Stamps, I got mine a few
years
> > ago
> > > > and never did anything with it.
> > > >
> > > > I'm using a Basic Stamp II to build a small engine
controller.
> > What
> > > > is a common way to control outside loads, such as a fuel
> > injector
> > > > which runs on 12V DC? I also need to be able to pulse 12V DC
> > through
> > > > a step up coil to make a spark across a spark plug. Currently
> > I'm
> > > > planning to use small solid state relays, and pulse them on
and
> > off.
> > > > I would use a separate 12 volt supply, and simply use the
stamp
> > to
> > > > switch them.
> > > >
> > > > Is there a better, more civilized way to do this? Would some
> > sort of
> > > > digital "driver" be better? I'm not sure how these "drivers"
> > work.
> > > >
> > > > Also, I need a way to detect crankshaft position exactly. I
was
> > > > thinking of small relay coils mounted beside the shaft, with
a
> > small
> > > > magnet stuck to the shaft, so when it passes, it induces
current
> > in
> > > > the coil and tells the stamp to trigger the spark or
injection
> > at
> > > > the right time.
> > > > I am sure there is a better way to do this as well...
> > > >
> > > > I would appreciate any advice I can get on this,
> > > >
> > > > Thanks
> > >
> > > How many cylinders?....With the correct interface hardware
(will
> > get to that
> > > later) the stamp can drive your loads, injectors, read your
inputs
> > (CKP
> > > sensor) etc.
> > >
> > > However, the BS2 may not be "fast" enough to run the engine,
> > especially at
> > > higher RPM.
> > > Also, the stamp basically can do only one thing at a time.
What I
> > mean is it
> > > will be a challenge to continuously read the CKP sensor,
cylinder
> > #1 sensor,
> > > then perform "interrupts" to pulse the ignition coil, injectors
> > and any other
> > > solenoids etc.
> > >
> > > The BS2 SX will probably be fast enough but you will still have
> > the challenge
> > > of the Stamp doing one thing at a time.
> > >
> > > If you still want to pursue your project, write back. The
hardware
> > interface
> > > to convert CKP into TTL (a signal the stamp can interpret), and
> > the hardware
> > > to interface your injectors, and ignition coil to the stamp is
not
> > too
> > > difficult.......
> > >
> > > Ken
> > >
> > >
> > > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> >
> > 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/
> >
> >
> >
> >
billak@f... writes:
> Well it's only a one cylinder engine. I thought about the speed, but
> I figured since I'm only concerned with one cylinder, I should be
> able to pull it off, as long as my external components react fast
> enough. I have managed to make a spark happen, and signal my
> injector, but because the SSR i was using had a 35 ohm drop on the
> 12 volts to the coil and injector it was a very weak spark and the
> injector hardly just clicked. I have a set of free SSRs on the way
> with 0.7-1 ohm resistance.
>
> What do you have in mind for interfacing it? Have you done something
> like this before? I have been thinking about it for a while and I
> think it is possible enough to pursue. I will obviously need two
> crankshaft position sensors, one to signal ignition time and one to
> signal injection time. They will be at maximum advance, and the
> stamp will have to be timing it.
>
>
> Thanks,
>
I just moved into a new office and can't find my documentation. Once settled
in I can give you some advice on driving the injector using a MOSFET and same
for the ignition coil, or are you using a magneto?
[noparse][[/noparse]Non-text portions of this message have been removed]
Original Message
> Well the motor is a one cylinder four stroke engine. Redline RPM at
> stock is 3600 RPM. If you run it faster than this stock it will most
> certainly throw the connecting rod through the side of the block.
> One I get this running, if possible I would like to make it turn
> faster. (This can be accomplished safely by installing a high
> strength racing connecting rod). But for now I'd like to have it
> able to turn 3600 RPM. Idle is from 1000-1500 usually. Common
> clutches engage at 2000 RPM.
>
> The reason I think it should be feasable is bacause since it is only
> one cylinder, nothing will have to be happening simultaneous,
> everything will be sequential. So if my stamp and my hardware
> interfaces can react fast enough it will work.
>
> Also, like most cars today it will not be a problem that injection
> and ignition will also occur on the opposite stroke that it needs
> to. In electronically controlled automobiles, this is known
> as "waste spark" and "waste injection". For example, ignition can
> occur on both combustion and exhaust stroke. The fuel is not really
> wasted though, it carries over into the next compression and
> combustion cycle. Many four cylinder cars pair up spark plugs and
> injectors for this reason, even though only one cylinder fires at a
> time.
with these motors. I have a vintage Fox minibike that I ride around
in the summer [noparse]:)[/noparse] It's a Tecumseh 3 horsepower flathead motor, but if
I get this working, I might switch over to a bigger and/or more
efficient engine like a overhead valve or overhead cam model.
Bill
--- In basicstamps@yahoogroups.com, Rodent <daweasel@s...> wrote:
> So are you doing the junior dragster thing?
>
>
>
Original Message
>
> > Well the motor is a one cylinder four stroke engine. Redline RPM
at
> > stock is 3600 RPM. If you run it faster than this stock it will
most
> > certainly throw the connecting rod through the side of the block.
> > One I get this running, if possible I would like to make it turn
> > faster. (This can be accomplished safely by installing a high
> > strength racing connecting rod). But for now I'd like to have it
> > able to turn 3600 RPM. Idle is from 1000-1500 usually. Common
> > clutches engage at 2000 RPM.
> >
> > The reason I think it should be feasable is bacause since it is
only
> > one cylinder, nothing will have to be happening simultaneous,
> > everything will be sequential. So if my stamp and my hardware
> > interfaces can react fast enough it will work.
> >
> > Also, like most cars today it will not be a problem that
injection
> > and ignition will also occur on the opposite stroke that it needs
> > to. In electronically controlled automobiles, this is known
> > as "waste spark" and "waste injection". For example, ignition can
> > occur on both combustion and exhaust stroke. The fuel is not
really
> > wasted though, it carries over into the next compression and
> > combustion cycle. Many four cylinder cars pair up spark plugs and
> > injectors for this reason, even though only one cylinder fires
at a
> > time.
http://www.newark.com
http://www.mouser.com/
http://www.herbach.com/
Original Message
From: <billak@f...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, January 22, 2003 8:11 AM
Subject: [noparse][[/noparse]basicstamps] Re: Controlling outside load
> Well I'm getting free "samples" of the SSR I was going to use from
> the company that makes them.
> Would a MOSFET or transistor react faster? I think the reaction time
> on these relays is like 1 ms.
>
> About the Hall sensor, now that I think about it, I think Chrysler
> used them to tell when their 2.2 and 2.5 liter "K" car type and
> minivan engines were turning. They put it in the distributor I think.
>
> Where do you guys buy your electronic components like this? Radio
> Shack doesn't have Smile anymore.
>
> Thanks,
>
> Bill
>
>
>
>
> --- In basicstamps@yahoogroups.com, "Jonathan Peakall"
> <jpeakall@m...> wrote:
> > Bill,
> >
> > SSR are pretty expensive, and you could use a much less expensive
> transistor
> > or mofset or something along those lines.
> >
> > To detect crank shaft position, how about a tiny NIB magnet and a
> Hall
> > sensor.
> >
> > Jonathan
> >
> > www.madlabs.info
> >
> >
Original Message
> > From: <billak@f...>
> > To: <basicstamps@yahoogroups.com>
> > Sent: Wednesday, January 22, 2003 7:34 AM
> > Subject: [noparse][[/noparse]basicstamps] Controlling outside load
> >
> >
> > > Hi, I'm sort of a newbie at Basic Stamps, I got mine a few years
> ago
> > > and never did anything with it.
> > >
> > > I'm using a Basic Stamp II to build a small engine controller.
> What
> > > is a common way to control outside loads, such as a fuel injector
> > > which runs on 12V DC? I also need to be able to pulse 12V DC
> through
> > > a step up coil to make a spark across a spark plug. Currently I'm
> > > planning to use small solid state relays, and pulse them on and
> off.
> > > I would use a separate 12 volt supply, and simply use the stamp
> to
> > > switch them.
> > >
> > > Is there a better, more civilized way to do this? Would some
> sort of
> > > digital "driver" be better? I'm not sure how these "drivers"
> work.
> > >
> > > Also, I need a way to detect crankshaft position exactly. I was
> > > thinking of small relay coils mounted beside the shaft, with a
> small
> > > magnet stuck to the shaft, so when it passes, it induces current
> in
> > > the coil and tells the stamp to trigger the spark or injection at
> > > the right time.
> > > I am sure there is a better way to do this as well...
> > >
> > > I would appreciate any advice I can get on this,
> > >
> > > Thanks
> > >
> > > Bill
> > >
> > >
> > >
> > >
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