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Published 20 hours ago • verified publisher icon nodemcu

GPIO low

Open ojvillar opened this issue 6 years ago • 2 comments

how to make nodemcu esp8266 GPIO LOW

ojvillar avatar Jul 07 '18 08:07 ojvillar

Hey there ... got the same problem ... i set the output D1 and D2 to low, but when i boot my NodeMCU this GPIO Pins are high. I can reproduce that also with D3 and D4 ... when i edit the GPIOs in my config file. What can i do?

NoTrace-Kai avatar Oct 03 '18 22:10 NoTrace-Kai

The readme file is really not describing it well, please fix.

Basically when the esp boots up i.e. power on or reset, then it reads the GPIO-00 pin. If the pin is LOW then the esp goes into listening mode awaiting a firmware update. That all happens before any of your programs run. This can only be done with a wire connected to the GPIO-00 pin bridging it to Ground on boot or reset.

  1. Connect a wire bridging GPIO-00 to ground (on a wemos board this is pin D3)
  2. While the wire is connected power the esp on on or reset it, either way.
  3. Now click the Flash button in the nodemcu-flasher and watch the progress bar as your esp is getting its firmware updated.

Hope this helps.

peter-hartmann avatar Dec 01 '19 03:12 peter-hartmann