Low-pass filter

zechdz · Post by **zechdz** » Tue Apr 26, 2016 12:01 am

Is there a way to apply a low pass filter on analog data?

Check out my braking data, I would like to see it without the high freq fluctuations from the sensitive sensor.

https://podium.live/events/2016-04-23-t ... ?laps[]=21

Mash · Post by **Mash** » Mon May 02, 2016 3:34 am

There is a simple IIR low pass filter that you can change in a config file. It's not exposed in the GUI, so you have to adjust it in the file directly.

rdoherty · Post by **rdoherty** » Thu May 05, 2016 5:36 pm

Yup, if you save your configuration file, then open it with a text editor there is the 'alpha' option. The smaller the value, the more filtering.

Open your config, find the 'analogCfg' section, then find the channel you want to edit. Save the file, open the config in the RC app and save it to RCP. We have it on our feature list to allow this to be set via the app.

razorlab · Post by **razorlab** » Mon Oct 09, 2017 2:46 pm

Is this exposed in the UI yet or do I need to do the config file change still?

dewittpayne · Post by **dewittpayne** » Tue Oct 10, 2017 12:52 pm

That looks like an exponentially weighted moving average filter. You want to make big changes in alpha. I'd start with 0.5, alpha/2, then if that's not enough go to 0.33, 0.25....