I've this board:
And my application is finished and running fine besides one issue: It do not run from a cold boot, I've to press the reset button.
I've an serial device attached to the Mega2560, communicating to the ESP8266 (this is a bit crappy). From cold start, the L LED on the board is on, if this LED is on I cannot program and my application is not running because the Mega2560 is somehow dead. When I press the reset, LED L is blinking second and then going off. After that I can programm and my application is running.
Do anyone knows what the LED L is for? It is connected to the Mega2560...
Ist there any setup to use a serial port from ESP8266 on this board, I do not need the Mega2560 anymore, this could also solve my issue.
Where is connector J9?
It would be great if someone has answers because currently I'm stuck with this board.