- Mon Nov 02, 2015 5:24 am
#32818
I have an ESP-01 and a LED connected to GPIO2. When I turn it on like that - both leds (red and blue) on the module light up and nothing works. It works if Ieave GPIO2 dangling and connect the LED a few seconds after the module boots. How do I make it boot nicely with the LED connected to GPIO2?
- Mon Nov 02, 2015 6:29 am
#32820
If GPIO2 is held LOW when booting, the ESP will enter into "firmware update mode" and will expect a firmware upload on the UART. You must make sure that GPIO2 will be held HIGH when booting (or at least unconnected, but that is unreliable), and you must design your circuit around that.
- Mon Nov 02, 2015 8:11 am
#32822
Try this, but it is negation output.
GPIO_LED.JPG (6.54 KiB) Viewed 7735 times
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- Mon Nov 02, 2015 9:43 am
#32829
I don't see the problem, GPIO2 is normally pulled up ????
The following link may be of interest.........
http://www.forward.com.au/pfod/ESP8266/ ... index.html
The following link may be of interest.........
http://www.forward.com.au/pfod/ESP8266/ ... index.html
