[BMP085 barometer sensor] Convergence speed issue

Other Hardware General Electronics
1

Hello,

I am using the barometer sensor (BMP085) to measure a pressure in order to estimate an altitude.
My environment setting is Arduino pro-mini and Arduino IDE 1.0.4.

I measured pressure at a specific height and moved the sensor to other height and measured pressure at that height. After then, I measured pressure again at the original position.

The problem is that the convergence speed is so slow.
The sensor frequency is about 20Hz. But, It takes about 4 minutes until reaching the constant pressure at a different height.

I attached a graph to easily understand my situation.
Is my setting(BMP085, Arduino pro-mini, IDE 1.0.4) having any problems?!

Do you have any words of advice?
Thanks.

pressure.PNG
pressure.PNG884×699 47.8 KB

2

I've used these devices, and found them quite noisy, so a smoothing algorithm is required, but much faster than 4 minutes... more like a second or so. perhaps yours is faulty?

regards

Allan