ESP8266 Community Forum

- Sat Aug 22, 2015 8:58 pm #26838 It depends if it is ESP-12E first generation or second (distinguishable by corners, what another thread mentioned as "fake" and "not fake" )...
I've received second generation last week, and I noticed that it is blinking even if serial port was quiet : Yes, there is activity on GPIO2, my I2C Bus ...

- Mon Feb 06, 2017 2:26 pm #62181

I also have a problem with using the onboard LED on my ESP-12E module.
It does not work with GPIO1 (It works fine with other modules, including ESP-12, but not ESP-12E).

Update:
My ESP-12E has onboard led connected to GPIO2 thru internal 470 Ohm resistor.

Mine worked on pin 2 as well. However, HIGH turns the LED off while LOW turns it ON. Anybody know why?

- Mon Feb 06, 2017 4:42 pm #62190 Same answer as the other thread :

When connecting an LED to a GPIO, it can be either in Sink or Source mode :