Voltmeter

[farouk_ch10]

Posted on January 31, 2014 at 21:34

Hello

I want to make a voltmeter using my STM32F4  discovery , actually these are my first steps and I am facing some problems and I need some help.Thank you very much. #lmgtfy

[farouk_ch10]

Posted on February 13, 2014 at 17:15

Thank you for your response,

I don't want to use the shunt for these reasons:- I am looking for innovation- The shunt allows you to measue only the current coming from the source but if you want to measure the current floating on other componenets in the circuit , you will not be able to do it because you have to put it  

in 

series .- I suggested using the shunt to my teacher and he advised me to look for another idea.Thank you very much

[chen]

Posted on February 13, 2014 at 17:32

Hi

''but if you want to measure the current floating on other componenets in the circuit , you will not be able to do it because you have to put it  

in 

series .'' If it were that easy, there would be lots of commercial probes on the market. As it happens there is only this one : http://www.tti-test.com/go/iprober/ ''- I suggested using the shunt to my teacher and he advised me to look for another idea.'' Have a guess why there is only 1 on the market.......

[farouk_ch10]

Posted on February 13, 2014 at 21:38

Hello,

Thank you for your response.Well this is very interesting , you have right , but can't I use amplifiers for example?, or the shunt is the best and the only solution , what do you think please? Thank you .

[Andrew Neil]

Posted on February 13, 2014 at 22:58

''I am looking...''

Are

you

actually looking? Or are you just wating for people to tell you?''my teacher ... advised

me

to look for another idea''Note that he expects

you

to do the looking!So - what searches have

you

done? what have

you

found?

''

can't I use amplifiers for example?, or the shunt is the best and the only solution''

Did you look at the Google search I posted earlier? There are plenty of techniques mentioned there...

HTTP://www.lmgtfy.com?q=current+sensor

HTTP://www.lmgtfy.com?q=current+probe

HTTP://www.lmgtfy.com?q=current+measurement

[chen]

Posted on February 14, 2014 at 10:12

''- I suggested using the shunt to my teacher and he advised me to look for another idea.''

''Well this is very interesting , you have right , but can't I use amplifiers for example?,'' You want to measure current? Go back to first principles. What does physics say. How does electrical properties manifest itself? I spent around 5 years working in a Non Destructive Test equipment company and everything to do with measurement was to do with physics. If your 'teacher' wants you to come up with a new way to measure current - think physics (first principles) (However, bear in mind that hundreds of people far more clever than your teacher have been looking for new ways to measure things for decades! People have been measuring electricity for nearly 300 years now - if there was a better way to measure it - do you not think we would have discovered it by now?)

[frankmeyer9]

Posted on February 14, 2014 at 11:46

Quite correct.

Hint to the OP:One of the measurable effects of an electric current, beside the voltage drop across a resistor, is the surrounding magnetic field.But that's not really 'innovation' - nihil novi sub sole.

[farouk_ch10]

Posted on February 14, 2014 at 22:42

Hello everyone

Thank you for all your responses,I just want to clarify some points:-Since my first post I have mentionned that I am a beginner and my nickname shows clearly that I am a student who is looking for ''SOME HELP'', I am not waiting for a realized project or a complete solution, what for???? If I were looking for this , I think that ''google'' will be the best helper ; copy and paste and everything will be ok. However , I am looking for innovating and clever solutions and ideas from experienced persons- The first part of my stm32f4 project (voltmeter) was successfully realized and I had posted just two questions : one to know how to start and the other one about booting the board. But now I am facing some problems because I am studying computer science not electronics , so it could happen that I post a silly question or information from time to time , but after receiving some piece of advise from experienced persons , I will be able to increase my level and experience little by little and this is the purpose of joining this community.Thank you for your help, patience and understanding.

[Andrew Neil]

Posted on February 14, 2014 at 23:48

''However, bear in mind that hundreds of people far more clever than your teacher have been looking for new ways to measure things for decades!''

 

and some of the papers publishing the results of their research are included among the results of the searches I've already suggested.

[Andrew Neil]

Posted on February 14, 2014 at 23:52

''I am looking for innovating and clever solutions and ideas''

 

And google is a great way to find them!

Other search engines are also available - not to mention your school library...