How do you use a Wheatstone Bridge to calculate Resistance using Bluetooth?

[MA2020]

Please, I updated the app, but the error is only in the minimum list, so how can I solve it?

[ABG]

I am guessing local variable rising_readings was an empty list.

So protect the marked block with a list length test.

[MA2020]

I did that, but it is not working, as till now the logic is reading the minimum as zero. Instead of that, can I get the resistance at 30 seconds, for example? And also, how can I filter the data, as the data have noise?

[ABG]

What does the wave form look like?

[MA2020]

The resistance is calculated from voltage and plot it versus time and the plot looks like rising graph the same as the baseline resistance app you shared before. The minimum resistance is working on your app with using slider but for my app is not working. However, I used the same code blocks.

[ABG]

I see 5 rising sections in your sample.

How do you know which to use?

[MA2020]

Yes the rising I will solve but the problem here is that it cannot calculate the minimum resistance. However, I can get the max resistance.
Also, for one rising section, it still has problem

[ABG]

The R0 calculation gives you the minimum value of the list of (time, resistance) pairs.

In your sample graph, it's lower than the starting resistance.

Isn't that what you want?

[MA2020]

Yes the R0 is the starting resistance so I need to get it to calculate the response

[ABG]

That's easy.

It's item 1 of your readings list.

[MA2020]

"Select list item: Attempt to get item number 2 of a list of length 1 ..." [SOLVED]

I need to set up a second item in my list, after loading from a file. My file is correct: "1","2" or I can do also: "1" "2" For the moment, I don't know which is the best because I need now only a 1D-list. But with the code that I have now, it doesn't recognize a second line or second item. I tried so many possibilities after hours, but I still get: [image] However, if my source is like this, I can get the data out of it, because it is in a nice list: [image] How can I split up the te…

Like this I have to do
Or do you have any suggestions?
No need to use minimum list, yes?

[MA2020]

I can get the value at any internal index and it is working
Let me ask one additional question: if I need to get the resistance value from the time, not by index. For example I need to set the time at 30 seconds and I need the resistance at this time value.

[MA2020]

Thanks
I did it and it is working, but it is written that the length of the list is large if it is more than 5

[ABG]

Show the error message in its entirety.

Your use of a temperature as an index into a list in the R0 calculation can't be right.

[ABG]

If you need the resistance at 30 seconds you would need to loop through the readings until you encounter one that's at or past 30 seconds, and grab it.

Break out of the loop.

If you fall off the end of the list, you don't have enough readings.