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### Topic: Current monitor (Read 4309 times)previous topic - next topic

#### pito

##### Oct 28, 2011, 06:07 pm
Here is a way how to measure a current on an ie. arduino system.
http://www.maxim-ic.com/datasheet/index.mvp/id/1853
Download pdf, and the figure 11. shows the current monitor schematics. It is a simple I->U converter.

#### 68tjs

#1
##### Oct 28, 2011, 10:30 pm
I am not sure to understand your question but if you want to measure a current with a voltmetrer (Arduino analog input are like a voltmeter) you can  use a transimpedance amplifier.
Search on google with this name there are many explanation and schematics.

#2
##### Oct 31, 2011, 07:47 pm
Basicly the Arduino A/D measures voltages.  So you need to run the current through a resistance, called a shunt, to generate a voltage.  Usually you want a very small resistance so you don't disrupt the current you are measuring.  This means you get a very small voltage, so you usually have to amplify it to get to voltages that an Arduino can accurately measure.

What type of currents do you want to measure?

#### oscaralegria182

#3
##### Feb 14, 2012, 07:45 am
Hello!

I'm working into a project where  I need to measure the current, actually I'm using a multimeter to do it,
but I want to use arduino to improve the measures, so, How can I do it? I have a very basics knowledges in electronics
I designed and develop  a program that measure the voltage and storage into a data base, my program can display a graphics of this
but I really need to measure the current. In my laboratory we have some kind of bio-battery  that produce energy so I need to measure the current.
somebody can help me?

PD
Sorry for my english

Thanks for any help!
Roaks

"La imaginación es mas importante que el conocimiento" AE

#### Constantin

#4
##### Feb 14, 2012, 01:16 pm
Try using a current sensor instead. Very nice solutions include the S22P series from Tamura. They do most of the heavy lifting for you, i.e. the output signal is always positive, centered around 2.5V so the Arduino can read it no problem. Lesser solutions cost a lot less also, see the openenergymonitor project for guidance, theory, sensor selection, and the arduino code to remove a biasing signal.

#### oscaralegria182

#5
##### Feb 14, 2012, 03:54 pm
Thanks Constantine,

I have one more question, in the next image

In this image we use a simple circuit and a protoboard with a variable resistor, we use a protoboard with a variable resistor, we use too three multimeters to measure
the current, voltage and resistence, so I was thinking, if I connect the wires to the multimeter to measure amperage to arduino, it will be possible to measure the current?, and if is possible, How I can  write this into the program for the arduino?.
The actual measures with the multimeters are for example, in current is around to 12 mA or 14 mA, in voltage is 750 mV.
Roaks

"La imaginación es mas importante que el conocimiento" AE

#### oscaralegria182

#6
##### Feb 14, 2012, 04:00 pm
Hi again,

I forgot to mention that it is a DC power supply
Roaks

"La imaginación es mas importante que el conocimiento" AE

#### Constantin

#7
##### Feb 14, 2012, 05:57 pm
It would help to have a diagram of what you are measuring and where in the circuit. The picture is certainly nice to have, but the circuit is more important. Please include voltages being applied, resistances, etc.

#### bahmankool

#8
##### Jan 18, 2014, 06:51 pm

I would appreciate any help on the following:

I am helping my son with a school project. The idea is to use a windmill that generates enough power to turn an LED on (Thames & Kosmos Wind Power 2.0) to read and display the power level (voltage and current) as it goes from 0 to highest speed.

http://www.amazon.com/dp/B003KYRSQC/ref=pe_385040_30332190_TE_M3T1_ST1_dp_1

How could this be done? I have Arduino Uno and the display.
What sensor module do I need to purchase?

Thanks,
bahman

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