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I would like to reduce the power consumption on my ESP8266 devices with a built in USB to UART.

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 Nodemcu with the serial connector.

However, it only reduces consumption from 90mA to 20mA when I use the Nodemcu which has USB connector (Lua Nodemcu WIFI Network Development Board Based ESP8266).

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.

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

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The voltage regulators on the NodeMCU board consume about 10ma. Please see this post for a detailed explanation: https://github.com/esp8266/Arduino/issues/719

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