Able to upload but Unable to run sketch on custom esp8266 board

Using Arduino Networking, Protocols, and Devices
1

Hi
We have made a custom board using the Esp8266ex IC. We are using the Arduino IDE to program it .

As a first step to install firmware we followed Flashing NodeMCU Firmware on the ESP8266 using Windows | Random Nerd Tutorials and flashed the nodemcu firmware . The flash was successful and there was a green tick shown.

Then we uploaded the basic example sketch 'Wificlient' using Arduino IDE , the upload was successful .

now we made GPIO 0 high to put the chip in running mode and powered it , but the board isn't running the uploaded code , there is no output on the serial monitor .

The power supply is external source.
Could someone help with this issue . thanks

2

do you have the right state at boot of the other boot configuration pins? what is printed to Serial Monitor?

3

yes , i have (10k)pull up on GPIO 2 , CH_PD , RESET , and while booting i connected GPIO0 to GND , in running mode i pull up(10K) GPIO 0 .

  1. when i connect GPIO to GND and upload sketch it uploads ok . then on the serial monitor i could see

nvnvNvvnvnvnvnvNN etc ., (according to the wifi client sketch the serial output is supposed to be "......" before connecting to wifi)

  1. when i connect GPIO to VCC and restart the module there is no serial output .
4

flyingbaloon:
yes , i have (10k)pull up on GPIO 2 , CH_PD , RESET , and while booting i connected GPIO0 to GND , in running mode i pull up(10K) GPIO 0 .

  1. when i connect GPIO to GND and upload sketch it uploads ok . then on the serial monitor i could see

nvnvNvvnvnvnvnvNN etc ., (according to the wifi client sketch the serial output is supposed to be "......" before connecting to wifi)

  1. when i connect GPIO to VCC and restart the module there is no serial output .

I can't find it in docs, but I think to remember, io 0 should not be connected without resistor

5

yes i have a pull up(10k) when connecting GPIO 0 to VCC

6

do you have the same baud rate in sketch and in Serial Monitor?