Altitude hold quadcopter BMP180

Projects Programming
1

Hi there,
i'm working on a quadcopter to hold an altitude. i'm using the bmp180, so i want to make a pid to hold an altitude.
the problem is the bmp180 verry noisy, so i wonder how to filter those noise and make the sensor smooth.
i heard there is some company who buikt drone, they fusion the barometer with z accelerometer. bit i have no idea to do this, i'm looking on the internet but no solution i find.
if someone did a altitude hold, i would like to give me some advises to make the bmp180 smooth.

Thanks :slight_smile:

2

Hi,
Watch following videos. The source code is provided in video description:

3

Thanks for the link, i saw this video, but the author doesn't give the altitude hold stabilty i told him 2 months ago, but he ddid't want to give me the code :slight_smile:

4

I think the ArduPilot is open sources but you have to digout the code for it...

5

it's verry complicated, what i want it's not reading barometer value, i want to filter the nbarometer from the noise, and it's not easy, we have to implement kalman filter and other tricks

6

Here's a source of free filter software.

7

And here's the ArduPilot software.

8

Hi thanks for thos elink, so could you tell me waht is the best filter for altitude hold stability
please

9

There are numerous filters that would work but you have a lot of interacting parameters. You have to consider several frequencies, the noise source, ADC sampling, motor update rate, filter corner. I would first look at the documentation for ArduPilot and see how it was handled. You also have to consider how much of a work load the CPU can handle.

10

Thanks for all those informations :slight_smile: