ESP8266 Community Forum

Today I flashed all my ESP8266 ESP-1 boards with two different firmwares:

v2.0 AT Firmware(ESP) and ai-thinker-v1.1.1

They all get flashed successfully. So I connected these modules with an Arduino Nano software serial and all wen fine until I power down and power back on. The blue LED is solid blue and no matter what it will be stuck that way. The power for the ESP is a 3.3V DC LD33 regulator with 100uF capacitor. There are plenty of current available, so I don´think it is power source related. Looks like something happens on software which bricks the ESP.

I strip all the software function and only using basic serial for communicate with the ESP.

Any suggestions?

Thank you in advance.

JR

The blue LED on an ESP-01 will be lit If you externally pull down the TX (= GPIO1)-port or set it LOW in the firmware.

So I connected these modules with an Arduino Nano software serial and all wen fine until I power down and power back on.

To confirm, did you connected the 3.3 volt ESP01 to the 5 volt Nano RX and TX pins? (direct connection without a level converter)