I recently purchased an ESP-32 that I use with MicroPython for a web server via Wi-Fi. Everything works very well and I decided to buy 4 more. But on none of the 4 works when I enable the Wi-Fi interface.
I get this error everytime :
>>> import network
>>> wifi = network.WLAN(network.STA_IF)
>>> wifi.active(True)
Brownout detector was triggered
ets Jun 8 2016 00:22:57
rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
I already searched on the web but I found nothing to solve my problem (changing usb cable, switching usb port, resetting and flashing micropython again... nothing works) and that on all of my 4 ESP-32
Do you have any idea of what is the problem and how to solve it ?
Infos:
The problem is that the esp32 is drawing to much power during WiFi transmission, and the voltage drops below a threshold causing brownout. If you are not using the 3.3V pin to drive additional components (or the GPIO pins for LEDs), this should not happen and is due to poor board design. To work around, you could try the following things:
decrease current draw, e.g. by:
reduce/disable the brownout threshold (probably requires compilation of micropython)
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