Measuring altitude/pressure

Other Hardware Sensors
1

Hi there,

I am involved in a project where we are making a device that would measure the movement of a person's wrist and for this certain project, we need to know the altitude of which the wrist is moving within (regardless of the below surface/environment).

I have been searching the web for an altimeter/barometer but the best that I could find was one that could give me a resolution of around 9cm, which is still not good enough for this project.

I was wondering if anyone knows a way of accurately (~5cm) measuring the height of an object without using Infra-red/laser, or an altimeter/IMU/Arduino/barometer that can provide that resolution.

Thanks,

Roham

2

Sounds like you need a triple axis accelerometer and a bit of double integration on each axis to determine translation-in-space

3

jackrae:
Sounds like you need a triple axis accelerometer and a bit of double integration on each axis to determine translation-in-space

He'd need his wrist to continually encounter a fixed point of reference or the location calculation would quickly drift too far off to be useful. Perhaps he could employ a hall sensor that would detect his belt buckle.