NodeMCU successfully compiled and uploaded a simple blink sketch on board, no errors at all, but the LED stays on constantly and does not blink. Also I have checked the power is enough. I have checked this with all pins but the red LED only stays on and doesn't blink. I have no idea what could have gone wrong. And how to fix this?

1 Answer 1


Fixed it.... turns out that in the tools, the board was selected to be NodeMCU 0.9 when it should actually have been NodeMCU 1.0 so i just changed it to NodeMCU 1.0 and it worked!

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    accept your answer to finalize this Q&A
    – Juraj
    Apr 12, 2018 at 15:26
  • @Juraj isn't there a 24h waiting period as on other sites?
    – idkfa
    Apr 12, 2018 at 15:44

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