Single Seat Off Road Race Car - HELP
Archiver
Posts: 46,084
>I am working on a dashboard system for a single-seat off road race
>car used in the SAE Mini Baja Competition( I am a Electromechanical
>Engineering Student at Wentworth in Boston) We are looking to sense
>engine rpm and I need a way to output a digital pulse for
>every 'spark' of the ignition (the spark happens on every revolution
>even though the power stroke is every other) anyways.. I know there
>are tachs out there that simply wrap around the spark plug wire. If
>there is anyone who knows how to do this it would be greatly
>appreciated.
>
>Additionally, The fuel level is being sensed using a float that
>changes resistance proportionalto the height of the fuel (230-30 ohms
>over full to empty range). What is the easiest way to condition this
>signal to 0-5v without the luxury of dual supplies. (We are running
>on 12v battery for power). I know how to do it using a differential
>amplifier but that requires the use of a negative supply (I think).
>
>Any help will be greatly appreciated as we are working on this as we
>speak.
>car used in the SAE Mini Baja Competition( I am a Electromechanical
>Engineering Student at Wentworth in Boston) We are looking to sense
>engine rpm and I need a way to output a digital pulse for
>every 'spark' of the ignition (the spark happens on every revolution
>even though the power stroke is every other) anyways.. I know there
>are tachs out there that simply wrap around the spark plug wire. If
>there is anyone who knows how to do this it would be greatly
>appreciated.
>
>Additionally, The fuel level is being sensed using a float that
>changes resistance proportionalto the height of the fuel (230-30 ohms
>over full to empty range). What is the easiest way to condition this
>signal to 0-5v without the luxury of dual supplies. (We are running
>on 12v battery for power). I know how to do it using a differential
>amplifier but that requires the use of a negative supply (I think).
>
>Any help will be greatly appreciated as we are working on this as we
>speak.
Comments
wire, or coil wire if you need to count all the firings.
normdoty@h...
>From: "jay_mann2000" <jay_mann2000@y...>
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] Single Seat Off Road Race Car - HELP
>Date: Mon, 11 Mar 2002 16:25:38 -0000
>
> >I am working on a dashboard system for a single-seat off road race
> >car used in the SAE Mini Baja Competition( I am a Electromechanical
> >Engineering Student at Wentworth in Boston) We are looking to sense
> >engine rpm and I need a way to output a digital pulse for
> >every 'spark' of the ignition (the spark happens on every revolution
> >even though the power stroke is every other) anyways.. I know there
> >are tachs out there that simply wrap around the spark plug wire. If
> >there is anyone who knows how to do this it would be greatly
> >appreciated.
> >
> >Additionally, The fuel level is being sensed using a float that
> >changes resistance proportionalto the height of the fuel (230-30 ohms
> >over full to empty range). What is the easiest way to condition this
> >signal to 0-5v without the luxury of dual supplies. (We are running
> >on 12v battery for power). I know how to do it using a differential
> >amplifier but that requires the use of a negative supply (I think).
> >
> >Any help will be greatly appreciated as we are working on this as we
> >speak.
>
>
>
>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/
>
>
_________________________________________________________________
Join the world’s largest e-mail service with MSN Hotmail.
http://www.hotmail.com
[noparse][[/noparse]Non-text portions of this message have been removed]
attachments. Could you email it to me directly or give me a URL where I can
find it.
Thanks
At 05:35 PM 3/11/02 +0000, norman doty wrote:
>jay, here is a small jpg of a schematic to get the pulses from a spark plug
>wire, or coil wire if you need to count all the firings.
>
>normdoty@h...
>
>
>
> >From: "jay_mann2000" <jay_mann2000@y...>
> >Reply-To: basicstamps@yahoogroups.com
> >To: basicstamps@yahoogroups.com
> >Subject: [noparse][[/noparse]basicstamps] Single Seat Off Road Race Car - HELP
> >Date: Mon, 11 Mar 2002 16:25:38 -0000
> >
> > >I am working on a dashboard system for a single-seat off road race
> > >car used in the SAE Mini Baja Competition( I am a Electromechanical
> > >Engineering Student at Wentworth in Boston) We are looking to sense
> > >engine rpm and I need a way to output a digital pulse for
> > >every 'spark' of the ignition (the spark happens on every revolution
> > >even though the power stroke is every other) anyways.. I know there
> > >are tachs out there that simply wrap around the spark plug wire. If
> > >there is anyone who knows how to do this it would be greatly
> > >appreciated.
> > >
> > >Additionally, The fuel level is being sensed using a float that
> > >changes resistance proportionalto the height of the fuel (230-30 ohms
> > >over full to empty range). What is the easiest way to condition this
> > >signal to 0-5v without the luxury of dual supplies. (We are running
> > >on 12v battery for power). I know how to do it using a differential
> > >amplifier but that requires the use of a negative supply (I think).
> > >
> > >Any help will be greatly appreciated as we are working on this as we
> > >speak.
> >
> >
> >
> >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/
> >
> >
>
>
>
>
>_________________________________________________________________
>Join the world's largest e-mail service with MSN Hotmail.
>http://www.hotmail.com
>
>
>[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/
Larry G. Nelson Sr.
mailto:L.Nelson@i...
http://www.ultranet.com/~nr
I did a quick schematic using a LM358 op-amp, 7 resistors (all but one
preferred values) and a zenner. Should give about 3% accuracy for the
gauge.
Which way does the sender go ?. I assumed 30 ohms full, 230 ohms empty.
All will work from a single rail 12v dc supply. If this is of any use,
e-mail me and I'll scan the circuit and e-mail it to you.
Rob
Original Message
From: jay_mann2000 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=brvvARhaQvwiSmd4gLB73d9Eux3MlZrJeJgYxA2-xNl0JTYddMNUCqx9G9ryLKwiKphQM4re7BE4aY5yS4g]jay_mann2000@y...[/url
Sent: 11 March 2002 16:26
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Single Seat Off Road Race Car - HELP
>I am working on a dashboard system for a single-seat off road race
>car used in the SAE Mini Baja Competition( I am a Electromechanical
>Engineering Student at Wentworth in Boston) We are looking to sense
>engine rpm and I need a way to output a digital pulse for
>every 'spark' of the ignition (the spark happens on every revolution
>even though the power stroke is every other) anyways.. I know there
>are tachs out there that simply wrap around the spark plug wire. If
>there is anyone who knows how to do this it would be greatly
>appreciated.
>
>Additionally, The fuel level is being sensed using a float that
>changes resistance proportionalto the height of the fuel (230-30 ohms
>over full to empty range). What is the easiest way to condition this
>signal to 0-5v without the luxury of dual supplies. (We are running
>on 12v battery for power). I know how to do it using a differential
>amplifier but that requires the use of a negative supply (I think).
>
>Any help will be greatly appreciated as we are working on this as we
>speak.
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/
That would be great! Thanks a lot.. if you want to you can just email me the
scanned schematic directly.. It is 230 ohms Empty I believe...
Thanks again,
J
Rob <robbed666@b...> wrote: Hi,
I did a quick schematic using a LM358 op-amp, 7 resistors (all but one
preferred values) and a zenner. Should give about 3% accuracy for the
gauge.
Which way does the sender go ?. I assumed 30 ohms full, 230 ohms empty.
All will work from a single rail 12v dc supply. If this is of any use,
e-mail me and I'll scan the circuit and e-mail it to you.
Rob
Original Message
From: jay_mann2000 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=9fs1HocsCTP2wJ-pDA39OqajUYkDVor8L_eDUqFFlNeH25vMo9CKkj-nCCnudbhikn6F-dv-bk2hCfUn]jay_mann2000@y...[/url
Sent: 11 March 2002 16:26
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Single Seat Off Road Race Car - HELP
>I am working on a dashboard system for a single-seat off road race
>car used in the SAE Mini Baja Competition( I am a Electromechanical
>Engineering Student at Wentworth in Boston) We are looking to sense
>engine rpm and I need a way to output a digital pulse for
>every 'spark' of the ignition (the spark happens on every revolution
>even though the power stroke is every other) anyways.. I know there
>are tachs out there that simply wrap around the spark plug wire. If
>there is anyone who knows how to do this it would be greatly
>appreciated.
>
>Additionally, The fuel level is being sensed using a float that
>changes resistance proportionalto the height of the fuel (230-30 ohms
>over full to empty range). What is the easiest way to condition this
>signal to 0-5v without the luxury of dual supplies. (We are running
>on 12v battery for power). I know how to do it using a differential
>amplifier but that requires the use of a negative supply (I think).
>
>Any help will be greatly appreciated as we are working on this as we
>speak.
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/
Do You Yahoo!?
Try FREE Yahoo! Mail - the world's greatest free email!
[noparse][[/noparse]Non-text portions of this message have been removed]
Please email me that picture too!
Darryl
At 05:35 PM 11/03/02 +0000, you wrote:
>jay, here is a small jpg of a schematic to get the pulses from a spark plug
>wire, or coil wire if you need to count all the firings.
>
>normdoty@h...
>
>
>
> >From: "jay_mann2000" <jay_mann2000@y...>
> >Reply-To: basicstamps@yahoogroups.com
> >To: basicstamps@yahoogroups.com
> >Subject: [noparse][[/noparse]basicstamps] Single Seat Off Road Race Car - HELP
> >Date: Mon, 11 Mar 2002 16:25:38 -0000
> >
> > >I am working on a dashboard system for a single-seat off road race
> > >car used in the SAE Mini Baja Competition( I am a Electromechanical
> > >Engineering Student at Wentworth in Boston) We are looking to sense
> > >engine rpm and I need a way to output a digital pulse for
> > >every 'spark' of the ignition (the spark happens on every revolution
> > >even though the power stroke is every other) anyways.. I know there
> > >are tachs out there that simply wrap around the spark plug wire. If
> > >there is anyone who knows how to do this it would be greatly
> > >appreciated.
> > >
> > >Additionally, The fuel level is being sensed using a float that
> > >changes resistance proportionalto the height of the fuel (230-30 ohms
> > >over full to empty range). What is the easiest way to condition this
> > >signal to 0-5v without the luxury of dual supplies. (We are running
> > >on 12v battery for power). I know how to do it using a differential
> > >amplifier but that requires the use of a negative supply (I think).
> > >
> > >Any help will be greatly appreciated as we are working on this as we
> > >speak.
> >
> >
> >
> >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/
> >
> >
>
>
>
>
>_________________________________________________________________
>Join the world's largest e-mail service with MSN Hotmail.
>http://www.hotmail.com
>
>
>[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/
norm
>From: Darryl Teichroeb <dteich@s...>
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: Re: [noparse][[/noparse]basicstamps] Single Seat Off Road Race Car - HELP
>Date: Tue, 12 Mar 2002 22:44:09 -0700
>
>Norm,
>
>Please email me that picture too!
>
>Darryl
>
>At 05:35 PM 11/03/02 +0000, you wrote:
> >jay, here is a small jpg of a schematic to get the pulses from a spark
>plug
> >wire, or coil wire if you need to count all the firings.
> >
> >normdoty@h...
> >
> >
> >
> > >From: "jay_mann2000" <jay_mann2000@y...>
> > >Reply-To: basicstamps@yahoogroups.com
> > >To: basicstamps@yahoogroups.com
> > >Subject: [noparse][[/noparse]basicstamps] Single Seat Off Road Race Car - HELP
> > >Date: Mon, 11 Mar 2002 16:25:38 -0000
> > >
> > > >I am working on a dashboard system for a single-seat off road race
> > > >car used in the SAE Mini Baja Competition( I am a Electromechanical
> > > >Engineering Student at Wentworth in Boston) We are looking to sense
> > > >engine rpm and I need a way to output a digital pulse for
> > > >every 'spark' of the ignition (the spark happens on every revolution
> > > >even though the power stroke is every other) anyways.. I know there
> > > >are tachs out there that simply wrap around the spark plug wire. If
> > > >there is anyone who knows how to do this it would be greatly
> > > >appreciated.
> > > >
> > > >Additionally, The fuel level is being sensed using a float that
> > > >changes resistance proportionalto the height of the fuel (230-30 ohms
> > > >over full to empty range). What is the easiest way to condition this
> > > >signal to 0-5v without the luxury of dual supplies. (We are running
> > > >on 12v battery for power). I know how to do it using a differential
> > > >amplifier but that requires the use of a negative supply (I think).
> > > >
> > > >Any help will be greatly appreciated as we are working on this as we
> > > >speak.
> > >
> > >
> > >
> > >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/
> > >
> > >
> >
> >
> >
> >
> >_________________________________________________________________
> >Join the world's largest e-mail service with MSN Hotmail.
> >http://www.hotmail.com
> >
> >
> >[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/
>
>
>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/
>
>
_________________________________________________________________
Send and receive Hotmail on your mobile device: http://mobile.msn.com
[noparse][[/noparse]Non-text portions of this message have been removed]