ESP8266 Community Forum

I'm having the problem...

I have flash Blinky project, LED connected to between GPIO2 and GND. When my ESP01 is restarted, it will not boot normally. (LED always bright and Not Blinky ).

If I temporarily disconnect the LED circuit, the board will boot normally, and after reconnecting , my program works as desired (LED is Blinky normal ).

Is there anything I can do to get this unit booting normally without having to leave GPIO2 floating? Because in reality, LED port always connected to GPIO2 and GND.

As you can see in https://github.com/esp8266/esp8266-wiki ... ot-Process, the GPIO2 needs to be pulled up to boot normally. If you attached a LED to GND, it will pull it down. So, simply reverse the LED with current limiting resistor to VCC instead.

@martinayotte Can you help me Draw circuit ?

Here are some images from the Web.

Sourcing a LED has the effect of pull-down, not good it the current case :


Sinking is acting like a pull-up, but the side effect is that logic is reversed, software setting GPIO to "1" turn off the LED while "0" make it glowing :