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accelerometers

Advice on accelerometers

Some questions about accerometers:

1) Which would be a good buy? I am putting together an order at seeedstudio cause they seem to have all the stuff I need at good prices. I'm thinking of throwing in this accelerometer, but I don't know if it's any good? I also saw that polulo has this cheaper model. So which would be the better buy? Or perhaps a 3rd option?