ESP8266 Community Forum

- Thu Mar 05, 2015 7:39 pm #11420 Hi, I need some help because my ESP8266 12 is not responding to UART commands.
I've pulled up CH_PD and RST to VCC with 1K resistor (pins are @3.3V)
When I power up module blue leds flashs for short time and receive some trash in serial monitor (serial monitor on arduino ide), I tryed 9600. 57600 115200 etc..
Added LF + CR at end and only CR and nothing
Module consumption is arround 30mA and power supply is a regulator stepdown max300mA@3.3V

Even when I try to load nodemcu firmware is not detecting (GPIO0 was connected to ground and reset after that) and log msg is Note:Begin find ESP8266.

******SOLVED**** (Thanks Byesp03madness)
run mode:
-CH_PD HI
-GPIO15 LO
flash mode:
-CH_PD HI
-GPIO15 LO
-GPIO0 LO


Best regards,Vito

Last edited by Vitoa on Thu Mar 05, 2015 9:57 pm, edited 1 time in total.

- Thu Mar 05, 2015 9:43 pm #11422 The garbage from UART is likely bootload output coming in at ~75k baud. Use a logic analyzer to read it.

I use these settings for gpio pins

run mode:
-CH_PD HI
-GPIO15 LO

flash mode:
-CH_PD HI
-GPIO15 LO
-GPIO0 LO

If you're getting bootloader output the chip is alive and is just a matter of getting it to run. Keep going!

Some of my work