Recording data from two adxl345 sensors

OK, I see now what happened.

I scheduled the following timing:
17:30 until 22:30 (5 hr)
23:00 until 05:00 (6 hr)
07:00 until 12:30 (5.5 hr)
13:00 until 18:00 (5 hr)

The last schedule was my mistake — I needed it to finish before 17:30, but because it continued past that, it overrode the 17:30 schedule from the next day.

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You say you did shake the tree but why don't you post the readings ?

I'm sorry for that, but I did not recording that testing

That olive tree will not produce much movement unless wind is strong.

As first it is stiff wood when it ages anf then in this terribly dry weather leaves fall too early

which again makes the branch less reactive to the wind

Maybe you could upload one code version without RANGE and ALPHA to gain more output

Thanks for the above suggestion.

I was also thinking of trying to use this AD8232 sensor to try to get hidden data from within the tree. Do you think I should try it, or would that be a waste of time?

From what I saw on the web, people use it attached to a plant leaf. I get the feeling that attaching it to a tree branch wouldn't work as well as I'd like. maybe to try the olive tree leave themselves? What's your opinion?

Regarding smoothing - which object I should look into? slide? I don't find the smoothr object in my Max9

Maybe you could upload one code version without RANGE and ALPHA to gain more output

Any manipulation I can do on the already recorded data with the code that included RANGE and ALPHA? to gain more output?

Thanks

You dont get what Iam saying

Your tree sends less range

Remove RANGE abd ALPHA completely to pass raw data as is

I will not repeat that again

Allready recorded data can be scaled or amplified but it lost it's original peaks

So it would need sort of expander, but this is out of my interest and time.

Delete that recordings and get new ones with

that modification

You shoud read a bit about what a green leave can provide to such sensor compared to olive leave

You need no smoothing more than that line

Maybe on dsp side as I allteady told you and also will not repeat it again

Thank you for all the help and for being so patient explaining this. I understand now( it took me a while..) — I'll remove RANGE and ALPHA completely and pass the raw data as-is, and I'll delete the old recordings and start fresh once that's in place.

You can bring slpha back reduced if you find it is too jumpy, but that is hardly possible

with that branch

Thanks, I tested manually (not on the tree yet) with RANGE=1 and ALPHA=1 (both have no effect, as I understand it — same as passing the raw value), and I understand it better now.

I did have some fluctuating noise with threshold set to 0.1 (sensor at rest). I changed it to 0.2 and it removed that fluctuation. I'm wondering if that's a problem?

You don't need to jump from 0.1 to O.2 there are also values in between

P.S. whatever value you need to prevent fluctuations will tell you how high is electrical jitter of that sensor.

You removed RANGE which now sets min max to total span of 19.6

If you really need 0.2 then jitter is more then 10%

at the end I got a little time to see what that AD8232 sesor is,

why did you not say it is heartbeat detector ?

Don't loose time with it.