ESP8266 Community Forum

Hi everyone
First, thamk you for your time and help.

I would like to reduce the power consumption by using the sleep mode.

I used this function :
system_deep_sleep_set_option(0);
system_deep_sleep(5 * 1000000);

This function works ok and reduces consumption to 0.1mA if I use

However, it only reduces consumption from 90mA to 20mA when I use

The difference between the two is that the second Nodemcu has a UARTtoUSB module. So I suppose that this is what causes the power consumption during the sleep mode.

Would it be possible to make the second one only consume 0.1mA as well ?

You are using a Devkit. This isn't optimized for low power running. It is petty simple to rig up your own through hole board which doesn't have the UART chip on it. and if you do so then you will find that the power consumption is as per the Espressif working papers.