From: "Stuart Wallace"
Subject: Re: help with digital dashboard/logger
Date: Sat, 26 Oct 2002 01:56:23 +0100
NNTP-Posting-Date: 26 Oct 2002 00:59:07 GMT
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Your ideas sound interesting -- I'm working along similar lines at the
moment. If you want to log performance data, you might also want to consider
getting some Analog Devices ADXL202JE twin-axis integrated accelerometers.
These (surprisingly cheap) ICs will enable you to measure longitudinal and
lateral g forces, so you can record things including:
- cornering performance (g-circle, etc)
- acceleration/braking times
- standing quarter times
- real-time engine power output, if you know
vehicle mass, Cd and frontal A
You could probably make a rudimentary inertial navigation system with these
devices: with this you could get data from your logger allowing you to plot
where the car had been. The accelerometers will read up to *about* +/- 2g --
plenty for a road car. I believe that the +/- 10g version of the ADXL202 is
used as a backup INS in some missile guidance systems, so it can't be too
rubbish. I believe Analog Devices give away free samples of most devices --
this may well be one.
Anyway, all this is probably not connected with what you're actually
doing -- if this is the case, please accept my apologies!
PS. I can't resist asking, I'm afraid: what car is this going into??