liam.mccaffrey
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| posted on 8/7/09 at 10:36 AM |
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Megasquirt Tach Signal
What does the MS tach output signal look like, is it pulsed or analogue?
Many Thanks
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flak monkey
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| posted on 8/7/09 at 11:23 AM |
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Its a 5 or 12v square wave depending where you pick your power up from.
I used this diagram
http://www.msextra.com/manuals/MS_Extra_Hardware_Manual.htm#tachoout
With two 1Kohm resistors and picked up the power form the S12c point on the board.
David
[Edited on 8/7/09 by flak monkey]
Sera
http://www.motosera.com
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Jenko
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| posted on 9/7/09 at 10:54 AM |
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David, did you use this method to power a VDO rev counter?....I can't seem to get mine working...
MY BLOG - http://westfieldv8.blogspot.co.uk/
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flak monkey
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| posted on 9/7/09 at 11:23 AM |
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quote:
Originally posted by Jenko
David, did you use this method to power a VDO rev counter?....I can't seem to get mine working...
No its powering a digital dash designed to take a square wave signal.
You might need to generate a high voltage spike if its a VDO tacho designed to be driven from the neg side of a coil. There is another diagram on the
page linked above to do just that.
Sera
http://www.motosera.com
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Jenko
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| posted on 10/7/09 at 08:42 AM |
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I tried that other method but could not get it to work...that said...I didn't try too hard, as I run a digital rev counter also, but I want to
get rid of this and go back to the VDO...
Cheers for the link anyway.
Paul.
MY BLOG - http://westfieldv8.blogspot.co.uk/
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