ESP8266 has solid blue light after flash, no wifi connection #368

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MrUnknownDE · 2026-04-05T17:52:50+02:00

MrUnknownDE commented

2026-04-05 17:52:50 +02:00

Originally created by @IlexisTheMadcat on 4/22/2022

No matter what I do to the firmware code in platform.ini and defines.h (I've tried the website auto writer and manually), every time I flash the code to the board, it absolutely will not connect to my network. I am now 100% sure all the pins are connected and configured correctly in defines.h. I did install the USB to UART driver by Silabs and restarted my PC multiple times in case it needed it (idk).

Some information I know right now:

Board: HiLetgo ESP8266 (NodeMCU V2)
IMU: MPU6050
When the ESP is connected via micro USB, the devices shows in PlatformIO under COM4
upload_port does not come specified in platform.ini on the current commit, so I added it myself with the value COM4
Flashing returns as "SUCCESS"
ESP doesn't connect to WiFi, which I've tried both hardcoding and via SlimeVR Server (which failed)
SlimeVR Server doesn't recognize I2C device on COM4 (assuming it works correctly)

Things I've tried:

Commenting upload_speed
Flashing the firmware stock (defines.h still configured)
Hardcoding WiFi credentials, both on home network and PC hotspot

I swear, the board is just doing nothing, the only time that LED flashes for any reason other than being flashed, is the exact moment I open the port with SlimeVR Server, and that's it. As I said, SlimeVR doesn't recognize, but more specifically: "Can't find an I2C on specified address, scanning for other I2C devices and returning" then I assume it returned with no result.

*Originally created by @IlexisTheMadcat on 4/22/2022* No matter what I do to the firmware code in `platform.ini` and `defines.h` (I've tried the website auto writer and manually), every time I flash the code to the board, it absolutely will not connect to my network. I am now 100% sure all the pins are connected and configured correctly in defines.h. I did install the USB to UART driver by Silabs and restarted my PC multiple times in case it needed it (idk). Some information I know right now: - Board: HiLetgo ESP8266 (NodeMCU V2) - IMU: MPU6050 - When the ESP is connected via micro USB, the devices shows in PlatformIO under COM4 - *upload_port does not come specified in platform.ini on the current commit, so I added it myself with the value* COM4 - Flashing returns as "SUCCESS" - ESP doesn't connect to WiFi, which I've tried both hardcoding and via SlimeVR Server (which failed) - SlimeVR Server doesn't recognize I2C device on COM4 (assuming it works correctly) Things I've tried: - Commenting upload_speed - Flashing the firmware stock (defines.h still configured) - Hardcoding WiFi credentials, both on home network and PC hotspot I swear, the board is just doing nothing, the only time that LED flashes for any reason other than being flashed, is the exact moment I open the port with SlimeVR Server, and that's it. As I said, SlimeVR doesn't recognize, but more specifically: "Can't find an I2C on specified address, scanning for other I2C devices and returning" then I assume it returned with no result.

MrUnknownDE closed this issue

2026-04-05 17:52:50 +02:00

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Reference: github/SlimeVR-Tracker-ESP#368