Reading the continuously changing voltage

Community General Discussion
1

There are changes in the voltage I measure.
I want to see that the measured voltage is as stable as possible at the end of the time.

  1. I want to display the stable voltage end of this period
  2. I want to display this period (0-9 Seconds)
  3. I want to display this gap.

Could you please guide me

2

Please explain what this means.

Please explain what you mean by "gap".

Post some time/voltage examples, or a graph, so that people might have some idea what the real problem is.

3

Hi,
Have you written any code yet to read your analog input?
What level is the voltage?
What model Arduino are you using?

Thanks.. Tom.... :smiley: :+1: :coffee: :australia:

4

Thank you vey much for your quick interest.

  1. I read a temperature fluctuation. At the end of a certain period of time, I want to see the point where the fluctuation reaches the minimum.
  2. The difference between minimum and maximum reading (fluctuation level)(gap)
  3. Time is 9 second maximum. Max temperature measuring is 5V and 0.05V for the gap.
5

It sounds like you should collect an array of temperature readings for 9 seconds, then search for the minimum and maximum values in the array.

Example:

int max = 0, index_max = 0;
for (int i = 0; i < array_length; i++) {  //search for max value
if (temp[i]>max) {
 max = temp[i];
 index_max=i;
 }
}
6

Hi TomGeorge,
Thanks a lot.
Yes, I have a code for reading the analog input with averaging. And measure 5V in three digit display
I am using Arduino Uno

7

If you are only interested in the extremes, no array is needed.

8

Thank you so much @jremington,
I am not expecting such quick response.

9

Hello @jfjlaros ,
I am not interest with extremes, I want to see steady state level and also average of min and max value (gap)

10

I am not sure what you mean by "steady state level", but min and max are the extremes. You can calculate the average of these values without using an array.

11

Hi,
I gather that @glamo is not interested in the overall average, what he or she is interested in is after 9 minutes the current temperature fluctuations are within a certain "gap".

So you only need to measure the fluctuations continuously over say the previous minute and at the 9 minute stage use the final fluctuations, of that last minute, as the data to be analysed for stability.

I hope that is not as clear as mud, I'm off to bed, 2:26am here.

Tom... :smiley: :+1: :australia: :sleeping: :sleeping: :sleeping: :sleeping: :sleeping:

12

Hi @TomGeorge .
Exactly, Have a good night with happy dreams

13

Ah I see.

14

Do you expect the temperature to behave like this?

image
image800×612 26.3 KB

Or rather like this?

image
image800×600 19.2 KB

15

Hello @mancera1979,
Thanks a lot. Actually, my diagram is below.
temp_level

16

Hello jremington,
I want to try your code, would you please add some comments such as "array_length", I am trying to learn, your each word is important for me.
Best regards

17

array_length is the declared size of the array temp[], e.g.
int temp[10]

18

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