ESP8266 Community Forum

Hi all!
Im using a lolin nodemcu v3 board to decode 433mhz signal from a weather station and upload everything on wunderground.
Everytjing work perfectly but only with serial monitor opened
I can't understand why......
The 433mhz receiver send data to d3 pin(gpio0 on esp8266).
If i try to use any other gpio, it doesn't work even with serial monitor opened..the last strange anomaly is that i always see the esp access point if i try to scan for wireless network.....need some.helps
....thank you guys

Hi guys!
i'have just solved this issue yesterday!!
The problem was that using gpio0(D3 on nodemcu-lolin) as an input,is not so tricky, because gpio0 is used to flash firmware.
I have connected the pin(D5) to the rx 433mhz and now everything works perfectly!!!!!

Yes, they should definitely write down a list of non-usable GPIOs on various ESP8266 breakouts... It's really a shame that a pin is there but you cannot actually use it because at startup it will mess up the boot process!

jumpjack wrote:Yes, they should definitely write down a list of non-usable GPIOs on various ESP8266 breakouts... It's really a shame that a pin is there but you cannot actually use it because at startup it will mess up the boot process!

FLASH label on D3 means the "flash' button for the NodeMCU.