Arduino Nano - how to lower power consumption

Projects General Guidance
1

Hi, I need a low power consumtion on my Arduino Nano, I am running this code:

#include "LowPower.h"
void setup()
{
}
void loop() 
{
     LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);  
}

Using this library - GitHub - rocketscream/Low-Power: Low Power Library for Arduino
With the power LED desoldered, I am still getting 3,4 mA while sleeping, is there a way to lower it even further?

2

How are you powering it? The voltage regulator on the Nano will consume a lot of power.

Have you read Nick Gammon's power page?

3

How are you powering the Nano? Have you removed the 5V regulator? Are you running at 8 MHz so you can use 2.4V instead of 3.78V? Have you removed the USB-to-Serial chip?

Perhaps an Arduino Mini which doesn't have a USB-to-Serial chip would be a better starting place.

4

I am powering it through a 5V power supply directly to the 5V pin.
Yes, I read it, but right away he writes:
SLEEP_MODE_PWR_DOWN : 0.36 mA
I am getting 3.4mA, 10x as much.

5

Yes, but go back to the top of that page and read the assumptions again. As John correctly pointed out, there are other peripherals on the Nano board which don't sleep.