Yes I found these (and some others). Interesting option, but not very much I/O pins (may or may not suffice for a particular task, although I also use I2C and SPI I/O extenders quite often). Also I don't think any of them have SPI RAM, do they? I'd like to have SPI RAM for receiving and buffering i...

That is very odd. Just to check it's not a hardware issue: can you reproduce it on other supermini boards as well?

Your image is unreadable potato quality; suggest you share it as a PDF rather than an image. Aside from that, please check the basics: are your voltage rails okay? Do you see 40MHz on the main crystal? Do you get any output on the serial port on power-on or reset?

#incluir "BluetoothSerial.h" #si !definido(CONFIG_BT_ENABLED) || !definido(CONFIG_BLUEDROID_ENABLED) #error ¡Bluetooth no está habilitado! Ejecute make menuconfig y habilítelo. #terminara si ...the only reason I can explain this is that English is your native language, but you chucked this in an au...

USB-C specs say you should connect the receptacle to ground ( here , page 135) so you can get rid of C1/R3. I'd personally add an 10uF on VCC as well, but that's more intuition than grounded in theory. Wrt adding resistors/inductors, please follow the hardware reference guide , for instance the C3 d...

You're probably running out of interrupts, and the encryption mqtt wants to do indirectly initializes the hardware RSA peripheral, which needs an interrupt to work. You can free up interrupts by marking them as shared (use the correct flag when initializing peripherals for that) or you can disable h...

'delay' doesn't do anything wrt sleep modes. You probably want to read up on deep sleep a bit and retry writing your code.

That cannot be it; nvs initialization is not asynchroneous so nvs is available when the initialization routine finishes. My bet is still that your program runs for a small while (less than 900ms, seemingly) between the flashing being done and your serial monitor starting. Flashing resets the chip af...

Check esp_timer, it should be easily able to give you 400Hz. You can also use one of the hardware timers;I think Arduino has support for those built-in.

Can I ask what you're trying to achieve here? On the ESP32 series, you're usually better off using one of the peripherals rather than trying to bitbang something. For instance, you may want to look at the RMT peripheral if you need to generate 'weird' signals.