the Ina219 module is a good choice i guessHi,
Which method is useful or not depends on your requirements:
* Isolating or not?
* Accuracy
* precision
* measurement range
* voltage drop
* cost
* size
....
The straight forward method is a resistive measurement method.
--> Feed a 1mA signal through a 1kOhm resistor and get 1V.
You are free to use lower ohmic resistors and amplifiers.
Klaus
its a device to test the Continuity of Internal Coating for TubeHi,
Without circuit details... it ´s impossible for me to give reliable recommendation.
Answer the questions above. Show a (hand drawn) schematic of what you want to do.
Klaus
i didn't test it because no one recommend it to measure mA'sWhats wrong with the ACS712 solution ? What circuit symptoms are you
seeing ? Why do you say its not working ?
Regards, Dana.
why?I´m even more confused.
Klaus
its first time working with this kind of circuitsHi,
it´s still not clear what and how you want to do.
Why not useing a DVM?
Why no simple sketch?
Why not the simple resistor method?
Why do you (in post#1) say ACS712 module does not work, but then you say you never tested it. And you say no one recommends it ... but youalready excluded it yourself on post#1.
Why do you in post#10 talk about a power supply test .... but no one before.
and so on...
Klaus
HiHi,
it´s still not clear what and how you want to do.
Why not useing a DVM?
Why no simple sketch?
Why not the simple resistor method?
Why do you (in post#1) say ACS712 module does not work, but then you say you never tested it. And you say no one recommends it ... but youalready excluded it yourself on post#1.
Why do you in post#10 talk about a power supply test .... but no one before.
and so on...
Klaus
the less you are experienced the more important that you draw and write down your ideas. A drawing is urgent, not only for us, but for yourself.its first time working with this kind of circuits
Yes. This is the most forward, simplest and most precise method.using simple Resistor method you mean by testing Voltage drop after the resistor
Yes.by DVM u mean a volt meter?
We don't know why.i need an MCU to read the current for specified period of time
i. If you want to measure or test the continuity of a coating inside (or outside) of a tube, then you do not need precise value of the current. You just need to make sure that an appreciable current is flowing.its a device to test the Continuity of Internal Coating for Tube
be measuring Current through liquid solution using 5vdc
I do not understand what you are planning to do but.i want to build a device to measure the current flowing through ِِِAluminum Tube which must be coated inside with some hard isolation solution
the idea is to detect the quality of the coating
there must be specified Voltage for period of time
So i need to use an MCU to read the value & display it when test is done
thanks for the informationI do not understand what you are planning to do but.
Electrochemists have studied the effects of painting on corrosion. Painting as corrosion inhibitor is not a new subject. Once it was realized that corrosion is an electrochemical process, electrochemists have studied ways to prevent corrosion on metal bodies by painting. The focus was two fold: improve paint formulations and understand surface preparation (prior to actual painting). No, I am not meaning paintings by van Gogh or Klimt. I mean paints applied on exposed metal surfaces to prevent corrosion by air or water (the elements, in short).
Your focus is apparently similar. But then the design of the experiment to study a particular process is unique in every case and you cannot apply the same tools and techniques for every case. Aluminum is an extremely reactive metal (and naturally protected by a thin oxide layer) and there are lots of work on protecting the exposed metal surface from the elements. You could benefit from a regular literature search. Remember that a proper design of the experiment is key to success and not the details of the measurement of the volts and amperes.
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