Motion sensor or similar - what am I looking for?

3 1601

I'm totally new to this topc - but I've seen all the wearables lately and started to wonder:
What kind of sensor is inside thos step counters/watches etc.?

I'm curious whether it would be possible to get one of those sensors and then measure how many movements for how long went on.

Any idea how I would search for this?
(I just want to have the sensor - not a complete gadget)

I think they are using an IMU like this one (but smaller) :

You only need a accelerator, gyroscope, magnetometer. Then you can computer the attitude and distance.
The three sensors can all communicate with banana pi through I2C or SPI.

Thanks - I start getting results now and have the right stuff to search further.

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