I am using the Node MCU board V1.0 as shown below for a IoT application. It sleeps always and once in a minute wakes up, posts some value to the cloud and goes to sleep. Working OK.
But when I am developing code and the unit is connected to the laptop, at times there is a Red LED on board that comes on ( the one near the CH340 chip ) . Tried to figure out the function of this LED.
Any idea why it is there ?