ESP8266 Community Forum

I have made several versions of my project with ESP-07 module, and they all behave the same.

Problem is that until I solder module to the pcb, the ESP07 module boots fine and connects to wifi, but once the module is soldered it does not connect anymore. Connecting console to the test points does not work at all. Since I am using ESP07 module, it is not easy to desolder it, but I did it once and module worked while hooked back on programmer.

My project so simple that I cannot figure out where the problem is. I am suspecting that power supply is not adequate, but what I can measure it does provide 3.3V. I am powering project with 5V DC 1A. I am using tantal capacitors of 22uF around AMS1117. Could this be wrong?

Here is schematic of the project



Here is PCB


Any help would be appreciated.

I made separate board providing power supply to ESP module, and that works as well. So my suspicion is that I have copper interference somehow? Could that be the cause?

Incorrect connection for GPIO0, GPIO2, GPIO15 and REST. Add pull up and pull down resistors as needed.
For example http://esp8266.fancon.cz/esp8266-web-hygrometer-dht11-arduino/esp8266-web-hygrometer-dht11-arduino.html

Yes it turned that, as minimum, GPIO15 needs to be grounded for the successful boot from flash.