User Manual

LED Meanings

RED LED

Duration	Repeat	Meaning

GREEN LED

Green LED is on while NodeMCU is connected to a wifi network.

Green LED stays on for a very short interval when uploading frames to web as it finishes very fast. This may cause a misconception. Was it on while the wifi connection or it just blinked.

Duration	Repeat	Meaning
1000ms	1	NodeMCU woke up
50ms	10	Wifi connection failed
50ms	10	All saved frames are sent to NodeMCU
50ms	10	Json parsing failed
1000ms	3	Uploading frames to web is finished
1000ms	3	Downloading frames to Arduino Mega is finshed

BLUE LED

Blue LED stays on when serial communication between NodeMCU and Arduino Mega fails.

Duration	Repeat	Meaning
10ms	1	Frame sent to NodeMCU
10ms	1	Frame received from NodeMCU