WROOM32 wifi connection takes too long

[Azaelyus]

Hello guys,

im working on my latest project and im having some issues. Im trying to connect to wifi with code like this:

Code: Select all

    WiFi.mode(WIFI_STA);
    WiFi.enableSTA(true);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) delay(1);

The problem is that it takes 3200 ms everytime. Im using my own board with WROOM32 revision 1, which is the same as on ESP32 DevkitC. On DevkitC i get 900 in average with the same code and same upload program. Any ideas? I can give u my wiring scheme if needed.

Thank you.

[Azaelyus]

Any ideas please? This can help me saving like 200 running days with this module, because im powering ESP with LiFePo4 battery. Any second for me is really important.

[WiFive]

From the limited information it is most likely an antenna or power problem or bad calibration. Try erasing the flash. Post a photo and a schematic and serial debug output.

[Azaelyus]

Heres the schematic:


Battery im using: http://lygte-info.dk/review/batteries20 ... %20UK.html

Heres the PCB layout:


Heres the photo of my product:


Heres the detailed look of Wroom module:


Im running my code like this:

Turning HIGH pin 13, meassuring values (this goes with no problem). Then i turn the pin low and run the WiFi. Heres the critical momment, it takes 3200 ms everytime. Then i send those data to the server, which takes about 800 ms in average (the same as ESP DevkitC V2).

Uploading sketch:


What do you mean by printing serial output? This?


How can I erase the flash please? I have never done this and im not able to find anything for esp32, only ESP8266.

[luisonoff]

Maybe this is related?
https://github.com/espressif/esp-idf/issues/799

[Azaelyus]

Seems like there is a problem with arduino firmware. I have upload espidf-http-request and its connecting almost immediately (under 1 sec). I dont know what can be wrong tho.

[Azaelyus]

Ok guys, did not know what happend but its working now. I just deleted platformio packages and deleted compiled code from this project. Did clean compile and its working. Strange
Thanks tho!