What I don't understand is how to wait 20 microseconds directly before the first stop condition. You don't need to poll the GPIO that the SCL is on. If I understand things correctly, after the first stop condition (which is the P after the 20 microsecond delay in the above diagram,) the idea is to a...

Take a look at this video: https://www.youtube.com/watch?v=-ttiPfmrehU At 4:08 the video describes how to configure where to look for header files, including those in components/bt/bluedroid/api/include. The file used to import the include path settings in the video is part of ESP32 Snippets and can...

See Build and Flash with Eclipse IDE.

Interesting, very interesting indeed. There's some information about the board here too.

Do you mean if it's a good idea to invoke adc1_get_raw or adc2_get_raw in an interrupt routine? If so, I don't think it's a good idea as invoking these functions involves spinlocks which isn't a good idea in an interrupt routine. See here . In order to get good ADC readings multisampling is likely t...

And a Happy New Year to you too.

If the SD card reader has a CD (Card Detect) output it could be connected to an ESP32 GPIO to detect whether or not a card is present.

Does the file defining bigArray directly or indiectly include "sdkconfig.h"? If "sdkconfig.h" (which contains the define for CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY) is not directly or indirectly included then EXT_RAM_ATTR will be defined as the empty string here and an error message similar to ...

The capital "I" at the start of the message indicates that it's an information message rather than a warning,

for inet_addr add:

It's not fully clear if the protocol is a binary protocol or plain text protocol. It appears to be a binary protocol. If so, try with one of the following implementations of ParseData to see if it works. void ParseData(uint8_t * data) { uint32_t val = (data[0] * 100) + (data[1] * 10) + data[2]; ESP_...