The older Uno R3 draws about 200 mA when it is idling with no inputs or outputs connected. The newer version with the small square processor chip draws about 150 mA. These values will vary +/- 20 mA between different Arduinos of the same type, depending on what software is loaded. The total current will be higher if outputs are connected to loads which draw current.
I hope this helps.
Keith

 

Based on your question, I gather that your problem is actually a simplistic one.

Start with 45mA. Add 20mA for each pin in use. Is total more than 200mA? Then your system may not work. Otherwise, the total is a rough estimate answer to your question.

Another approach is using the maximum current the Arduino Uno will use. 200mA. Otherwise, a complete current draw analysis is necessary as well as a plan to shut down unneeded resources.

My guess is that 200mA is good enough.

 

Remember everyone.... This is NOT a real circuit.. He has it running in Proteus only.

The calculations are theoretical....

 

The older Uno R3 draws about 200 mA when it is idling with no inputs or outputs connected. The newer version with the small square processor chip draws about 150 mA. These values will vary +/- 20 mA between different Arduinos of the same type, depending on what software is loaded. The total current will be higher if outputs are connected to loads which draw current.
I hope this helps.
Keith

I suspect your answer is wrong. The maximum current into an ATMega328 is 200mA total. Using this as it’s idle current implies the Arduino can’t do anything. The Arduino Uno draws 45mA idling. Each pin can supply 40mA but design calls for 20mA. Hence, an average is 10 LEDs at 20mA can be driven.

 

The Arduino Uno draws 45mA idling.

That's what I get when I measure it, also.

 

I suspect your answer is wrong. The maximum current into an ATMega328 is 200mA total. Using this as it’s idle current implies the Arduino can’t do anything. The Arduino Uno draws 45mA idling. Each pin can supply 40mA but design calls for 20mA. Hence, an average is 10 LEDs at 20mA can be driven.

I stand corrected.
I measured the current on two older Uno R3 and two newer ones with the smaller processor chip. I am surprised and very lucky that I didn't blow all four of them. I just realized that my patch panel was connected to the variable supply output, set at +10 volts instead of the fixed 5 volt output. I checked their functionality and they all still work !!!
When they are connected to the 5 volt supply, the older R3s drew 43 ma and the newer ones 23 ma.
Thank you for pointing out my mistake. I could have done some real damage there. I guess that's what happens when you get old!
Regards,
Keith

 

The older Uno R3 draws about 200 mA when it is idling with no inputs or outputs connected. The newer version with the small square processor chip draws about 150 mA. These values will vary +/- 20 mA between different Arduinos of the same type, depending on what software is loaded. The total current will be higher if outputs are connected to loads which draw current.
I hope this helps.
Keith

Is the idle mode as standby mode?

 

I stand corrected.
I measured the current on two older Uno R3 and two newer ones with the smaller processor chip. I am surprised and very lucky that I didn't blow all four of them. I just realized that my patch panel was connected to the variable supply output, set at +10 volts instead of the fixed 5 volt output. I checked their functionality and they all still work !!!
When they are connected to the 5 volt supply, the older R3s drew 43 ma and the newer ones 23 ma.
Thank you for pointing out my mistake. I could have done some real damage there. I guess that's what happens when you get old!
Regards,
Keith

The idle current is 45 or 23mA?

 

The idle current is 45 or 23mA?

The measurements were made with programs loaded but with no connection to the inputs or outputs.

 

The measurements were made with programs loaded but with no connection to the inputs or outputs.

is 45mA or 23mA?

 

is 45mA or 23mA?

As I posted above, the one with the large dip processor took 43 mA and the one with the surface mount processor took 23 mA. It depends on which one you have.
Regards,
Keith

 

As I posted above, the one with the large dip processor took 43 mA and the one with the surface mount processor took 23 mA. It depends on which one you have.
Regards,
Keith
View attachment 210350

The idle current in this data sheet

As I posted above, the one with the large dip processor took 43 mA and the one with the surface mount processor took 23 mA. It depends on which one you have.
Regards,
Keith
View attachment 210350

As I posted above, the one with the large dip processor took 43 mA and the one with the surface mount processor took 23 mA. It depends on which one you have.
Regards,
Keith
View attachment 210350

This datasheet which I used, so is current 40 as in data sheet current per I/O?

Also, if yes then power in idle mode is 40mA * (7v as input voltage in data sheet)?

 

That datasheet value is the maximum current that one pin can supply. The total of all pins must be less than 200mA less the CPU current of 45mA (OR 23mA).

 

The current in the data sheet for the I/O data pins is the maximum current it can supply without being overloaded. The actual current per I/O pin will depend on what is connected to them when your program activates them.

 

That datasheet value is the maximum current that one pin can supply. The total of all pins must be less than 200mA less the CPU current of 45mA (OR 23mA).

So, where I find idle current in data sheet?
Or, it calculated experimental?

 

The current in the data sheet for the I/O data pins is the maximum current it can supply without being overloaded. The actual current per I/O pin will depend on what is connected to them when your program activates them.

So, where I find idle current in data sheet?
Or, it calculated experimental

 

So, where I find idle current in data sheet?
Or, it calculated experimental

What part of 45mA or 23mA don’t you understand? Depending on the Arduino board, that IS the idle current.

 

What part of 45mA or 23mA don’t you understand? Depending on the Arduino board, that IS the idle current.

Yes, I understand that 45mA or 23mA Depending on the Arduino board.
But my question : is this value in datasheet or its calculated experimentally?

 

Yes, I understand that 45mA or 23mA Depending on the Arduino board.
But my question : is this value in datasheet or its calculated experimentally?

Thanks for clarifying your remarks. I’ll have to check the datasheet myself.

 

Yes, I understand that 45mA or 23mA Depending on the Arduino board.
But my question : is this value in datasheet or its calculated experimentally?

The value is not in the data sheet that you posted. If you can find another one for the Uno R3,it may mention it but I doubt it.