Data Acquisition newbie question

[Don DRI05 Ricciardiello]

Brian,

Thanks for that lead, looks promising. Another question if  I may. Does the
DataQ Starter kit unit have to stay connected to the PC during use? If so
that's gonna prove difficult on the bike!

Don





From: Brian Dessent <brian at dessent.net>@diy-efi.org on 30/10/2001 16:08 PST

Please respond to diy_efi at diy-efi.org

Sent by:  owner-diy_efi at diy-efi.org


To:   diy_efi at diy-efi.org
cc:
Subject:  Re: Data Acquisition newbie question


Don DRI05 Ricciardiello wrote:

> I'm looking at the dataQ starter kit as a way of diving into the murky
> waters of data acquisition without the up front capital outlay and was
> wondering if anyone could help me understand the tracking engine rpm
data.
> How do you input this signal into the dataq module as a voltage?

Take a look at the LM2907 or LM2917 chips from National Semi:

http://www.national.com/ds/LM/LM2907.pdf

They are designed for just this purpose.  The application hints section
of the datasheet show sample circuits that output a voltage proportional
to RPM using either the crankshaft position (reluctance) sensor signal
or the ignition coil primary.  All you need is their chip and a few
resistors.  The datasheet shows many interesting automotive applications
in fact.  Plus if you go to their website (www.national.com) you can
order samples of the chip shipped overnight for free. (!!)

Brian
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