Voltage to Current conversion using Arduino Due Analog Output channel

Other Hardware General Electronics
1

Hello,

I want to measure current from Analog Output (i.e. DAC) of Arduino Due and also i would like to measure current using meter.
can anybody help with this.

2

What kind of load do you have? If you have a known resistance (or impedance) [u]Ohm's Law[/u] says Current (Amps) = Voltage/Resistance. It's far more common to calculate current than to measure it.

and also i would like to measure current using meter.

"Break" the circuit and [u]insert the meter in series with the load[/u].

When you say "also", do you want to also measure the current with the Arduino? That's not always practical because the Arduino measures voltage relative to its own ground. You need to insert a low resistance on the ground side and measure the voltage, and you'll probably need an amplifier to measure the voltage. (Typically, you don't want a voltage drop and a small resistance will keep the voltage drop to a minimum).

A DMM works the same way, but it doesn't have a "ground" so you can insert it anywhere in series with the load. And of course, it has a very-low resistance.

.

3

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html

Can you tell us your electronics, programming, arduino, hardware experience?

Thanks.. Tom... :slight_smile:

4

Be careful: an DAC pin can't output more than 3 mA !

5

ard_newbie:
Be careful: an DAC pin can't output more than 3 mA !

Yes and unlike the digital pins on the Uno that can be abused without damage sometimes, the Due goes pop every time you overload the pin. Well at least the DAC pin stops working permanently.

This sounds like an other X-Y Problem

6

Hi,
Can you tell us the application, why you need to measure output current?

Is it to drive another device?
If so how much current are you looking for?

Thanks.. Tom... :slight_smile: