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I am pretty sure this device worked yesterday. I tried to short GPIO0 to ground (flash), nothing. I have a second ESP that uploads fine, but this one does not.

Is their another way to get this bootloader to open up? Or am I the owner of a brand new door stop?

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  • 2
    show the complete wiring. is it a board or a basic module? Commented Jan 27, 2021 at 5:24
  • "doorstop", heh; maybe for a dollhouse ;) Does serial monitor show anything, like garbage, when you reset it attached? Commented Jan 27, 2021 at 6:35
  • @Juraj It's USB. I should have been more specific. There is no way to screw it up. Commented Jan 27, 2021 at 11:22
  • @dandavis Yes, I see a single line of garbage going across the screen in the serial monitor. Commented Jan 27, 2021 at 11:23
  • sorry I missed D1 mini in the tile. is something wired to the board? Commented Jan 27, 2021 at 11:34

2 Answers 2

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I'm not sure if this will help EVERYONE, but I hope it at least helps someone. I had the same issue with several different boards (3 Nano's, 2 NodeMCU ESP8266's, and 1 Uno). I searched and searched for an answer and I kept reading about this pin or that pin being "pulled low" or "pulled hi" interfering with uploading sketches. Well, since I couldn't find a solid answer anywhere I decided to disconnect all of the peripherals hooked to my board (except for powers and grounds) and Wah Laa!!! The sketch uploaded like it was supposed to. So, I believe if you just unhook all of the sending and receiving pins from all of your peripherals during upload, the sketch should upload just fine. I hope this helps you.

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  • I would just like to thank you for the surprising solution. I was on the verge of going bonkers searching for a solution. Commented Jan 13, 2023 at 23:02
  • You're welcome! I'm glad it helped. It is definitely tied to one of the I/O pins. It depends on what board you're using, but these boards usually have at least one pin that will not let any code upload if "pulled" up or down (depending on what it's expecting). I believe you can look these pins up through the board data sheets/specs. Commented Jan 15, 2023 at 17:38
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You must use the Arduino only as a pass-thru! -> So for programming the the esp8266, you need to BRIDGE the Arduino-RESET to GROUND!

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  • why? it is enough to not have Serial activated in the ATmega Commented Apr 15, 2023 at 6:51

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