Electronic – Looking for small motion sensor

motionsensor

Are there other options for a small (< 5mm long) low-g motion sensor than accelerometers? I don't need to measure the acceleration picking up my device causes, I just want a 1/0 signal when it happens. Preferably very low power, <10µA would be nice.
(IIRC I once saw a purely mechanical small sensor mentioned in an answer here, but I can't find it anymore. Purely mechanical means zero-power.)

Best Answer

Found this one:

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This is the SignalQuest SQ-MIN-200. It acts as a switch and chatters open and closed when moving:

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It's only 3.6 mm long and 1.9 mm diameter and consumes as little as 50 nA.