looking in my old car alarm, try a spring with a weight (a screw) on one
end soldered to a piezo buzzer disk. any vibration/motion flexed the disk
and generated a voltage...something like this


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V. Cheap!!!!

Wayne

>> >Two axis accelerometer IC (ADXL202 and friends.)
>> >$US15/1 Digikey.
>>
>> And you could probably get enough as samples for free from AD
>
> After several run-ins with Murphy lately, I'd rather pay for OTS
>
> AD's price is US$8.50 / 1000-4999
>
> http://www.analog.com/en/subCat/0,2879,764%255F800%255F0%255F%255F0%255F,00.
> html
>
> which you'd probably say is an easy NZ$15 / 10+ ? That's a big
> big part of $50 retail. I'll try Memec on Monday
>
> Would the lower-priced ones like ADXL320 or ADXL311 work
> as well ?
>
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