[Diy_efi] Low cost 2-axis accelerometer

[Barry]

I use a unit by Crossbow for tuning purposes - cost a bundle more, though 
($105, IIRC)!  Definitely gives some numbers to play with regarding 'real' 
acceleration vs. 'seat of the pants'.  Spikes in accel can make the vehicle 
*feel* faster, but the area under the curve plotted vs time gives the true 
picture.  Dunno about monitoring an actual engine with one, but I recall an 
article awhile back about one used on the belt tensioner to pick up knock - 
apparently the crankshaft gets a noticeable 'kick' from a knock event.

Barry

At 01:53 PM 12/2/02 -0800, you wrote:
>The Dec. '02 issue of Nuts-N-Volts magazine has an article on a 2 axis
>accelerometer from http://www.memsic.com, price is in the $10-15 range.
>Outputs are either a digital PWM or analog voltage depending on model,
>most seem to be either +/- 2 or 10G's. Most are surface mount, but the
>"GW" suffix parts are 14 pin DIPs.
>
>The technology they are using is interesting, details on their web site,
>I wouldn't think it would be suitable for automotive environments, but
>they mention using it for air-bags.
>
>Obvious use for DIYers is data logging and correlating tuning w/
>acceleration and horsepower. Not exactly related to this list, but one
>app. note suggests using it for a burglar alarm.
>
>Frequency response rolls off about 30Hz, but they have an app. note on
>how to get beyond 160Hz, makes me wonder if there might be some way to
>use it to monitor an engine, detecting a misfire perhaps? Getting a
>"signature" for later comparison?
>
>The article states the 2125GW is identical to Analog Devices ADXL202.
>
>rgds,
>philh
>(digest)
>
>_______________________________________________
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>http://www.diy-efi.org/mailman/listinfo/diy_efi


_______________________________________________
Diy_efi mailing list
Diy_efi at diy-efi.org
http://www.diy-efi.org/mailman/listinfo/diy_efi