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09-15-2009, 09:14 PM
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#1
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Newbie
Join Date: Apr 2009
Location: Davisburg, MI
Posts: 54
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Anybody have tachometer or speedometer?
I'd like to hear from some people that have succeeded in producing a tachometer or speedometer with the FB. My searches have yielded attempts and I hope they just never bothered to post their sucesses. Looking for some confidence I'm not wasting my time on these two points.
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09-18-2009, 12:11 AM
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#3
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Newbie
Join Date: Apr 2009
Location: Davisburg, MI
Posts: 54
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Your engine sounds like a conure.
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09-18-2009, 09:15 AM
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#4
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Admin. Don't bug or I'll byte.
Join Date: Sep 2004
Location: Corning, NY
Posts: 6,142
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Do you mean how would you build a tach/speedo mechanically or in software?
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09-18-2009, 10:18 AM
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#5
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Low Bitrate
Join Date: Dec 2007
Posts: 105
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Really the engine is a couple of cockatiels.. 
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09-18-2009, 10:59 AM
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#6
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Newbie
Join Date: Apr 2009
Location: Davisburg, MI
Posts: 54
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Quote: Originally Posted by Bugbyte  Do you mean how would you build a tach/speedo mechanically or in software?
Neither, I'm specifically looking for individuals that have successfully used a Fusion Brain to display RPM and Speed from a running car. Lot of people talked about doing it. I'm having issues getting stable believable results. Capacitor decoupling at the FB inputs and power input made some improvements last night, getting close with the Tach. Engine cooling fans on are still throwing it off 0.15V. Speed still a mess...
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09-18-2009, 11:46 PM
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#7
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Admin. Don't bug or I'll byte.
Join Date: Sep 2004
Location: Corning, NY
Posts: 6,142
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Okay, I've never used a fusion brain to do this but in 1986 I got speed from my car by using an infrared LED emitter and detector to bounce light off of the speedo housing (which was U shaped) as it turned. A friend built a digital circuit to count the number of times the housing went by and we queried the circuit to get the number and made the speed calculation based on the time that went by.
Surely the FB can count the number of times something turns -perhaps from a Hall effect sensor and then do the math?
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09-19-2009, 01:36 AM
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#8
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Maximum Bitrate
Join Date: Dec 2008
Posts: 621
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Quote: Originally Posted by Bugbyte Okay, I've never used a fusion brain to do this but in 1986 I got speed from my car by using an infrared LED emitter and detector to bounce light off of the speedo housing (which was U shaped) as it turned. A friend built a digital circuit to count the number of times the housing went by and we queried the circuit to get the number and made the speed calculation based on the time that went by.
even for today that is pretty ****in cool. for you to do that back then, i have a little manlove for you.
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09-19-2009, 10:38 AM
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#9
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Admin. Don't bug or I'll byte.
Join Date: Sep 2004
Location: Corning, NY
Posts: 6,142
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I'll only partially hijack this thread with the actual circuit as this is mildly relevant. The diagram shows at the bottom the LED emitter and detector. The rest of the circuit is the actual counting stuff.
Don't they have magnetic sensors you could put on an axle that could feed counts into the FB?
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09-19-2009, 12:06 PM
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#10
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Maximum Bitrate
Join Date: Dec 2008
Posts: 621
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Quote: Originally Posted by Bugbyte
Don't they have magnetic sensors you could put on an axle that could feed counts into the FB?
yes, on anti-lock brake cars... but most axles do come with the teeth on them, and many times a simple hole to drill in the hub allows for placement of the magnet sensor if you dont have abs.
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09-19-2009, 12:16 PM
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#11
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Newbie
Join Date: Apr 2009
Location: Davisburg, MI
Posts: 54
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Yes, but I'm trying to use the factory VSS. I have a frequency to voltage converter to provide 0-5V signal for the FB. I design door latches for a living. Producing the circuit above is over my head.
My speed sensor circuit works briefly, then measures at the FB 1.5-2V that won't go away until I shut everything off and start over.
Last edited by ACCLR8N; 09-19-2009 at 12:32 PM.
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09-19-2009, 12:54 PM
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#12
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Maximum Bitrate
Join Date: Jul 2008
Location: Boston, Ma or NY,NY
Posts: 562
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Quote: Originally Posted by Bugbyte I'll only partially hijack this thread with the actual circuit as this is mildly relevant. The diagram shows at the bottom the LED emitter and detector. The rest of the circuit is the actual counting stuff.
Don't they have magnetic sensors you could put on an axle that could feed counts into the FB?
You invented factory VSS....
Seems crazy to drill holes in axles when any car with abs should have individual wheel speed sensors and even cars without have a trans vss.
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09-19-2009, 02:09 PM
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#13
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Maximum Bitrate
Join Date: Dec 2008
Posts: 621
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Quote: Originally Posted by ACCLR8N Yes, but I'm trying to use the factory VSS. I have a frequency to voltage converter to provide 0-5V signal for the FB. I design door latches for a living. Producing the circuit above is over my head.
My speed sensor circuit works briefly, then measures at the FB 1.5-2V that won't go away until I shut everything off and start over.
it actually looks pretty simple, its hard to read so im not sure if i could pull if off just by going with the pic, but it doesnt seem that bad at all...
do you have a diagram of your circuit?
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09-19-2009, 02:17 PM
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#14
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Newbie
Join Date: Apr 2009
Location: Davisburg, MI
Posts: 54
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No. I've purchased the Hz to V board from the FB store. The VSS is a 17 pulse per driveshaft revolution out put as an AC sine wave, factory GM '95 LT1 M6 transmission.
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09-19-2009, 02:24 PM
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#15
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Maximum Bitrate
Join Date: Dec 2008
Posts: 621
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Quote: Originally Posted by ACCLR8N No. I've purchased the Hz to V board from the FB store. The VSS is a 17 pulse per driveshaft revolution out put as an AC sine wave, factory GM '95 LT1 M6 transmission.
ok i wasnt aware there was a kit. why are your cooling fans causing weird readings? as if the voltage drop in the system throws off the sensor?
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